The Milky Way Halo

The halo of the Milky Way has many different components, among them the dark matter halo, the gaseous halo and more compact objects like satellite galaxies, globular clusters and stellar tidal streams. With this chart here I have tried to depict the compact kind of objects as seen from Earth, with known (or at least suspected) populations and relations between the objects color-coded (see below). The biggest problem was the concentration of globular clusters towards the galactic center, resulting from the fact that many of these orbit close to the galactic bulge. To avoid completely unreadable clutter there the names of objects close to the galactic center only appear at higher zoom levels.

In the last decades many discoveries have improved our picture of the Milky Way halo. In particular the Sloan Digital Sky survey (SDSS) and several infrared surveys of the galactic plane have netted plenty of globular clusters (GCs), dwarf spheroidal galaxies (dSphs), very faint dwarf galaxies (UFDs), intermediates that may be one or the other (GC/UFD), and stellar tidal streams or 'overdensities' in our close galactic neighborhood. With the SDSS extending into the southern hemisphere, and the results of the Gaia mission, many more discoveries are to be expected. As it is, the count now stands at 251 companions, 185 GCs, 65 satellite galaxies and 3 intermediates with ambiguous properties.

The lines in the map are the major identified tidal streams or great circles of alignment (see below). Switch the different components of the galactiic halo on and off with the checkboxes below the map. Zoom and pan with mouse wheel/pinch and dragging. The source for the underlying map can be found at my Github repository.

Show         
Bulge/Disk
Disk
Bulge
Old Halo
Young Halo
Magellanic Stream
Sagittarius Stream
Gaia-Enceladus Stream
Sequoia Stream
Helmi Stream
Koala Stream
Canis Major(Monoceros) Stream
Fornax-Leo-Sculptor Stream
High Energy
Low Energy
Globular Cluster
Dwarf Galaxy
Retrograde
Galaxy Nucleus

The main difference between GCs and dwarf galaxies is that GCs only had a single burst of star formation and therefore a uniform stellar population. This makes it possible to determine their relative ages from the distribution of stars in color-magnitude diagrams (see next paragraph). Dwarf galaxies, on the other hand, are more diverse, many still have ongoing star formation, and likely a central black hole. Several GCs (omega Cen) have also been found to contain a central black hole and diverse populations; because of this they may be the remnant nuclei (N) of former galaxies. These include M 54, likely the core of the Sagittarius dwarf, NGC 2808, possibly the remnant core of the CMa dwarf or the newly found Gaia-Enceladus galaxy that collided with the Milky Way, NGC 2419 and Omega Centauri with no known associations at this point. (Mackey, van den Bergh 2005).

Halo populations and streams

Based on their characteristics, the globular clusters (GCs) of the Milky Way fall into different populations. The main distinguishing features are orbital motion and position, age estimated from the horizontal branch morphology and metallicity. The diagram on the right shows the relation of the latter two parameters for GCs of the Milky Way and some of its satellites. The curved lines are thought to be isochrones, i.e., they denote constant age along their path. The horizontal branch morphology refers to the distribution of stars that have left the main sequence and appear distributed horizontally on the Hertzsprung-Russell diagram, including RR Lyrae variable stars, the small cousins of Cepheids. The horizontal branch ratio is the ratio between stars to the right (red) side and on the left (blue) side of the RR Lyrae region of the distribution. A good overview of HB stars can be found in Catelan 2009.

Three distinct populations can be identified: Old metal-rich GCs in the galactic bulge and disk (BD), old metal-poor GCs of the old halo (OH) and younger metal-poor GCs of the young halo (YH), which are also mostly further away from the galactic center than the old halo members (Zinn 1993).

It is thought that the bulge/disk and old halo formed mostly along with the Milky Way proper, while the young halo contains GCs caught from accreted dwarf galaxies at a later time. It should be noted that 'young' and 'old' here are not absolute categories, but merely relative indicators of age, so that a 'young halo' cluster may still be 10 billion years old, which is still younger then the Milky Way proper.

Of the known satellites many show signs of tidal disruption, among them the Canis Major dwarf spheroidal (CMa), the Sagittarius dwarf spheroidal (Sgr) galaxies and the Magellanic stream (Mag) containing both Magellanic Clouds and several dwarf spheroidals. Each of these is associated with GCs and dwarfs which may be remnants of this tidal disruption, they are listed in the table below. (Forbes, Bridges 2010)

Several dwarfs and GCs lie along a great circle around the galactic center, called the Fornax-Leo-Scuptor (FLS) great circle after its main members, shown as the pink line in the chart. It is not quite clear yet if these are related remnants of a broken-up galaxy or represent a chance alignment, but there is mounting evidence that at least some of the members are indeed related. Other research sees all of the Milky Way's dwarf companions aligned in a "disk of galaxies" (Kroupa et al. 2004).

Another indicator of possible extragalactic origin is a retrograde motion (R), at this point there is no alignment or association known, so it is included as just an indicator.

Not shown: Gaseous and stellar clouds, open clusters in the Milky Way halo, Globular Clusters of (undisrupted) satellite galaxies. The four largest of which - the Magellanic Clouds, the Fornax and the Sagittarius dwarf - are known to contain their own globular cluster systems. Intriguingly, all of these are also associated with tidal features, as shown above.

The Virgo stream or Virgo stellar over-density is a very faint and very disrupted remnant that has been found in SDSS data. Recent analysis (Martinez 2006) has shown that it most likely represents the remains of an older loop of the Sagittarius dwarf around the Milky Way. Another tidal feature, the Monoceros stream or Anti-center stream, also found in SDSS data, probably is a part of the CMa dwarf's tidal stream that wraps several times around the Milky Way. Yet more debris streams have been reported in Grillmair 2006, one of which may be related to the Boötes III dSph. And more discoveries of Halo features are sure to come with further SDSS and other studies.

The list shows the members of the different halo components ordered by galactic longitude. The values are: Name(s) of the object, galactic longitude and latitude in degrees, absolute visual magnitude, half light radius in parsec, distance from the Milky Way center in kiloparsec, morphological type, population and stream membership (see below).

Name         Alt. Name   l      b     Mv      Rh     Dgc    Metal.  Type      Pop Stream
                         °      °     mag     pc     kpc    [Fe/H]            (1) (2)   
Milky Way        Gal.Cntr.         0      0    -20.9          460             SABbc I-II    
NGC 6723                           0.07 -17.30  -7.8     4.1    2.6   -0.96   GC        OH  MB
NGC 6287                           0.13  11.02  -7.4     2.0    2.1   -1.91   GC        OH  Koa
NGC 6558                           0.20  -6.02  -6.5     3.5    1.0   -1.44   GC        BD  MB
NGC 6569                           0.48  -6.68  -8.3     4.1    2.9   -0.86   GC        OH  MB MD?
Palomar 5        Pal 5             0.85  45.86  -5.2    20.0   18.6   -1.24   GC        YH  Hel
NGC 6325                           0.97   8.00  -6.9     2.2    1.1   -1.17   GC        BD  MB
NGC 6522                           1.02  -3.93  -7.7     2.4    0.6   -1.44   GC        BD  MB
NGC 6528                           1.14  -4.17  -6.6     1.0    0.6   -0.04   GC        BD  MB
NGC 6652                           1.53 -11.38  -6.7     1.9    2.8   -0.97   GC        OH  MB
M69              NGC 6637          1.72 -10.27  -7.6     2.2    1.9   -0.78   GC        BD  MB
Palomar 6        Pal 6             2.09   1.78  -6.8     1.8    2.2   -1.09   GC        YH  Koa
Camargo 1109                       2.17   0.84  -6.4            4.0   -1.5    GC        OH  
Djorg 2          ESO 456-SC38      2.76  -2.51  -7.0     1.6    1.4   -0.50   GC        BD  MB
NGC 6624                           2.79  -7.91  -7.5     1.9    1.2   -0.70   GC        BD  MB
M70              NGC 6681          2.85 -12.51  -7.1     2.4    2.1   -1.35   GC        OH  Koa
NGC 6540         Djorg 3           3.29  -3.31  -5.4     0.3    4.4   -1.20   GC        BD  MB MD?
BH 261           ESO 456-78        3.36  -5.27  -4.0     1.0    2.1   -1.3    GC            MB MD?
M107             NGC 6171          3.37  23.01  -7.1     5.0    3.3   -0.95   GC        BD  MB
Terzan 7                           3.39 -20.07  -5.0     6.6   16.0   -0.58   GC        YH  Sag
NGC 6401                           3.45   3.98  -7.9     5.8    2.7   -0.98   GC        OH  Koa Seq?
Terzan 9                           3.60  -1.99  -3.8     1.5    1.6   -2.00   GC        BD  MB
VVV CL150                          3.77   0.96                        -0.75   GC        BD  
Terzan 5         Terzan 11         3.84   1.69  -7.9     2.5    2.5    0.00   GC        BD  MB (N)
M5               NGC 5904          3.86  46.80  -8.8     4.6    6.2   -1.12   GC        OH  Hel G-E?
Terzan 10                          4.42  -1.86  -6.3     2.2    2.4   -0.70   GC        BD  G-E
NGC 6342                           4.90   9.73  -6.4     2.2    1.7   -0.69   GC        BD  MB
UKS 1                              5.12   0.76  -6.9     2.1    8.3   -0.50   GC        BD  
NGC 6553                           5.25  -3.03  -7.8     2.7    2.2   -0.21   GC        BD  MB MD?
VVV CL001                          5.27   0.78                                GC        BD  
M9               NGC 6333          5.54  10.70  -7.9     2.2    1.7   -1.75   GC        OH  Koa
Sagittarius I    SagDEG            5.57 -14.16 -13.5  1550     16.0   -0.5    dSph(t)       Sag
M54              NGC 6715          5.61 -14.09 -10.0     3.8   19.2   -1.25   GC        YH  Sag (N)
Terzan 8                           5.76 -24.56  -5.0     7.6   19.1   -1.80   GC        OH  Sag
NGC 6544                           5.84  -2.20  -6.7     1.4    5.3   -1.20   GC        OH  Koa G-E?
NGC 6356                           6.72  10.22  -8.5     3.3    7.6   -0.50   GC        BD  MD
NGC 6440                           7.73   3.80  -8.7     1.4    1.3   -0.34   GC        BD  MB
M28              NGC 6626          7.80  -5.58  -8.2     2.5    2.7   -1.45   GC        OH  MB
NGC 6638                           7.90  -7.15  -7.1     1.8    2.3   -0.99   GC        OH  MB
Terzan 12                          8.36  -2.10  -4.1     1.2    3.4   -0.50   GC        BD  MD
Arp 2                              8.55 -20.78  -5.3    15.9   21.4   -1.45   GC        YH  Sag
M55              NGC 6809          8.80 -23.27  -7.5     4.5    5.3   -1.81   GC        OH  Koa
2MASS-GC02       Hurt 2            9.78  -0.62  -4.9     0.6    4.1   -0.66   GC            
NGC 6642                           9.81  -6.44  -6.8     1.8    1.7   -1.35   GC        YH  MB
M22              NGC 6656          9.89  -7.55  -8.5     3.0    4.9   -1.49   GC        OH  MD
2MASS-GC01       Hurt 1           10.47   0.10  -6.1     1.5    4.5   -1.20   GC            
NGC 6717         Palomar 9        12.88 -10.90  -5.7     1.4    2.4   -1.09   GC        OH  MB
Palomar 8        Pal 8            14.10  -6.80  -5.5     2.1    5.6   -0.48   GC        BD  MD
Mercer 3         GLIMPSE-C02      14.14  -0.64                  3.0   -0.33   GC            
M10              NGC 6254         15.14  23.08  -7.5     2.3    4.6   -1.25   GC        OH  Koa
M12              NGC 6218         15.72  26.31  -7.3     3.1    4.5   -1.14   GC        BD  MD
IC 1257                           16.53  15.15  -6.2     3.2   17.9   -1.70   GC        OH  G-E
Mercer 5                          17.60  -0.11  -6.1     0.6          -1.3    GC        BD  
NGC 6366                          18.41  16.04  -5.8     2.8    5.0   -0.73   GC        BD  MD
Palomar 15       Pal 15           18.87  24.30  -5.5    15.7   37.9   -1.90   GC        OH  G-E
Sagittarius II   Laevens 5        18.9  -22.9   -5.2    32     60     -2.28   UFD           Sag?
NGC 6517                          19.23   6.76  -8.3     2.0    4.3   -1.37   GC        OH  Koa
M75              NGC 6864         20.30 -25.75  -8.5     2.8   14.8   -1.03   GC        OH  G-E
NGC 6539                          20.80   6.78  -8.3     4.1    3.1   -0.66   GC        BD  MB MD?
M14              NGC 6402         21.32  14.81  -9.1     3.5    4.1   -1.39   GC        OH  Koa
IC 1276          Palomar 7        21.83   5.67  -6.7     3.7    3.7   -0.73   GC        BD  MD
Pfleiderer 2                      22.28   9.32  -2.5            9.7    0.0    GC        BD  
NGC 6712                          25.35  -4.32  -7.5     2.8    3.5   -0.94   GC        OH  Koa (R)
NGC 6535                          27.18  10.44  -4.7     1.5    3.9   -1.51   GC        OH  Seq
M30              NGC 7099         27.18 -46.83  -7.4     2.7    7.1   -1.92   GC        OH  G-E (R)
Boötes III       Boö III          27.39  55.43  -5.8   170     44.0   -2.1    UFD           
RLGC 2                            27.63  -1.04  -9.0     2.1          -2.1    GC        OH  
NGC 6426                          28.09  16.23  -6.7     5.8   14.6   -2.11   GC        YH  FLS Hel?
Hercules I       Her I            28.73  36.87  -6.6   330    134.2   -2.41   UFD           
Palomar 14       AvdB             28.75  42.18  -4.7    24.7   69.0   -1.36   GC        YH  FLS
Palomar 12       Pal 12           30.51 -47.68  -4.5     7.1   15.9   -0.83   GC        YH  Sag
GLIMPSE-C01                       31.30  -0.10  -5.9     0.6    2.0   -1.61   GC            
Palomar 11       Pal 11           31.81 -15.58  -6.9     5.6    7.9   -0.39   GC        BD  MD
M72              NGC 6981         35.16 -32.68  -7.0     4.4   12.9   -1.21   GC        YH  Hel G-E?
NGC 6760                          36.11  -3.92  -7.9     4.7    4.8   -0.52   GC        BD  MD
NGC 6749                          36.20  -2.20  -6.7     2.5    5.0   -1.60   GC        OH  MD
NGC 5466                          42.15  73.59  -7.0    10.4   16.2   -2.20   GC        YH  Seq G-E (R)
M3               NGC 5272         42.21  78.71  -8.9     3.4   12.2   -1.34   GC        YH  Hel
NGC 6934                          52.10 -18.89  -7.5     2.7   12.8   -1.32   GC        YH  HE (R)
Palomar 10       Pal 10           52.44   2.72  -5.8     1.7    6.4   -0.10   GC        BD  MD
M2               NGC 7089         53.38 -35.78  -9.0     3.1   10.4   -1.31   GC        OH  G-E (R)(N)
NGC 7492                          53.39 -63.48  -5.8     9.2   24.9   -1.41   GC        OH  G-E
Aquarius II                       55.11 -53.01  -4.36  159            -2.3    UFD           
M71              NGC 6838         56.74  -4.56  -5.6     1.9    6.7   -0.73   GC        BD  MD
M13              NGC 6205         59.01  40.91  -8.7     3.3    8.7   -1.33   GC        OH  G-E (R)
M56              NGC 6779         62.66   8.34  -7.4     3.4    9.7   -2.00   GC        OH  G-E (R)
Laevens 3                         63.6  -21.2   -4.4     7     64     -1.9    GC/UFD    YH  
NGC 7006                          63.77 -19.41  -7.7     4.6   38.8   -1.63   GC        YH  Seq G-E?
M15              NGC 7078         65.01 -27.31  -9.2     3.2   10.4   -2.02   GC        YH  MD
M92              NGC 6341         68.34  34.86  -8.2     2.6    9.6   -2.16   GC        OH  G-E
Kim 1                             68.51 -38.43   0.3     6.0          -1.7    GC            
Segue III                         69.4  -21.27  -0.0     3.0          -1.7    GC        YH  
Pegasus III                       69.85 -41.81  -3.4    78            -2.1    UFD           
Boötes IV        Boö IV           70.682 53.305 -4.53  462            -2.2    UFD           
NGC 6229                          73.64  40.31  -8.0     3.3   29.7   -1.43   GC        YH  G-E
Canes Venatici  ICVn I            74.31  79.82  -8.6   564    219.8   -1.98   dSph          FLS
Balbinot 1                        75.18 -32.64  -1.2     7.2          -1.58   GC        OH  
Pisces II                         79.21 -47.11  -5.0    60    180     -2.45   UFD           
Draco I          DDO 208          86.37  34.72  -8.8   196     82     -1.93   dSph pec      Mag
Palomar 13       Pal 13           87.10 -42.70  -3.7     3.5   26.7   -1.74   GC        YH  Seq (R)
Draco II         Laevens 4        98.3   42.9   -2.9    19     22     -2.7    UFD           
Ursa Minor I     DDO 199         104.97  44.80  -8.8   280     68.0   -2.13   dSph          Mag
Muñoz 1                          105.44  45.48  -0.4     7.1          -1.5    GC            
Canes Venatici IICVn II          113.58  82.70  -4.9    74    150.7   -2.21   UFD           FLS
Palomar 1        Pal 1           130.07  19.03  -2.5     2.2   17.0   -0.70   GC        BD  MD
Gaia II                          132.15  -8.74  -2.0     3            -1.0    GC        YH  
FSR 584                          134.05   0.84           4.5          -2.0    GC        OH  
Triangulum II    Laevens 2       141.4  -23.4   -1.8    16     36     -2.24   UFD           
Segue II                         149.4  -38.1   -2.5    40     38.0   -2.22   UFD           Sag? TriAnd?
NGC 288                          152.28 -89.38  -6.7     5.7   12.0   -1.14   GC        OH  G-E (R)
Ursa Major II    UMa II          152.46  37.44  -4.2   140     36.5   -2.47   UFD           
Cetus II                         156.48 -78.53   0.0    17            -1.28   UFD           
Willman 1                        158.58  56.78  -2.7    25     43     -2.1    UFD           
Ursa Major I     UMa I           159.43  54.41  -5.5   318    104.9   -2.18   UFD           
Whiting 1                        161.62 -60.64  -2.5     1.6   49.0   -0.65   GC        YH  Sag
DES J0225+0304                   163.58 -52.20  -1.1    18.6    0.5   -1.26   GC/UFD        Sag?
Cetus III                        163.81 -61.13  -2.5    90            -2.2    UFD           
Palomar 2        Pal 2           170.53  -9.07  -8.0     5.4   35.4   -1.30   GC        YH  G-E
NGC 2419                         180.37  25.24  -9.42   17.9   91.5   -2.15   GC        OH  Sag (N)
Koposov 2                        195.11  25.55  -0.4     1.8   26.3   -0.6    GC        YH  Sag?
Palomar 4        Pal 4           202.31  71.80  -6.01   17.2  111.8   -1.41   GC        YH  FLS
Leo T                            214.85  43.66  -8.0   178    425     -2.02   UFD           
Eridanus                         218.11 -41.33  -5.1    10.5   95.2   -1.20   GC        YH  FLS
Leo II           DDO 93          220.17  67.23  -9.8   151    208     -1.62   dSph pec      FLS
Segue I                          220.5   50.4   -1.5    29     25     -2.72   UFD           FLS? Sag?
Hydra I          Hya I           224.7   29.1   -2.5                  -0.91   UFD           CMa?
Leo I            DDO 74          225.99  49.11 -12.0   246    254     -1.43   dSph          FLS
M79              NGC 1904        227.23 -29.35  -7.9     3.0   18.8   -1.37   GC        OH  G-E
Gaia I                           227.34  -8.75  -5.1     9            -0.7    GC        YH  
Columba I        Col 1           231.62 -28.88  -4.5   103                    UFD           
Fornax I         ESO 356-4       237.10 -65.65 -13.4   668    140     -0.99   dSph          Mag
Canis Major I    CMa I           239.99  -8.00  -8.3            8.0           dIrr          CMa
Palomar 3        Sextans C       240.14  41.86  -5.7    17.8   95.9   -1.63   GC        YH  FLS
Coma Berenices I Com I           241.9   83.6   -4.1    77     45.2   -2.6    UFD           FLS Sag?
Sextans I                        243.50  42.27  -9.27  682     89     -1.93   dSph          FLS
NGC 1851                         244.51 -35.04  -8.3     1.8   16.7   -1.03   GC        OH  G-E (N)
NGC 2298                         245.63 -16.01  -6.3     2.4   15.7   -1.71   GC        OH  G-E
Eridanus II                      249.78 -51.65  -6.6   172            -2.38   UFD           Mag?
NGC 4147                         252.85  77.19  -6.2     2.4   21.3   -1.5    GC        YH  G-E
Pictor I                         257.30 -40.65  -3.7    31            -1.7    UFD           Mag??
AM 1             E1              258.36 -48.47  -4.73   15.2  124.6   -1.47   GC        YH  FLS
Carina I         Car 1           260.11 -22.22  -9.1   241    103     -1.72   dSph          Mag
Koposov 1                        260.98  70.76  -4.3     3.0   36.3   -0.6    GC        YH  Sag?
Pyxis                            261.32   7.00  -5.7    15.6   41.7   -1.30   GC        YH  HE
Leo V                            261.86  58.54  -5.2    42    180.8   -2.0    UFD           FLS?
Horologium II                    262.47 -54.14  -2.6    47            -2.1    UFD           Mag?
Antlia II        Ant II          264.90  11.25  -8.5  2867            -1.36   dSph          
Leo IV                           265.44  56.51  -5.8   116    160.6   -2.54   UFD           FLS
Reticulum II                     266.30 -49.74  -2.7    32            -2.46   UFD           Mag?
Pictor II        Pic II          269.63 -24.05  -3.2    46            -1.8    UFD           Mag?
Carina II        Car II          269.98 -17.14  -4.5    91            -2.44   UFD           Mag
Carina III       Car III         270.01 -16.85  -2.4    30            -1.80   UFD           Mag
NGC 1261                         270.54 -52.13  -7.8     3.6   18.2   -1.08   GC        YH  G-E
Horologium I                     271.39 -54.73  -3.4    30            -2.76   UFD           Mag
Phenix I         ESO 245-7       272.16 -68.95  -9.8          445     -1.49   IAm V-VI      
NGC 1868                         273.76 -34.74  -7.9                          GC            Mag
Reticulum III                    273.88 -45.65  -3.3    64                    UFD           Mag??
Eridanus III                     274.3  -59.60  -2.0    18                    UFD           Mag?
Laevens 1        Crater          274.8   47.8   -5.3    19.4  145     -1.9    GC        YH  HE
Virgo I          Vir I           276.94  59.58  -0.3    47            -2.2    UFD           
NGC 1818                         276.99 -35.34  -8.8                  -0.4    GC            Mag
NGC 3201                         277.23   8.64  -7.5     3.9    8.9   -1.24   GC        YH  Seq (R)
NGC 1846                         278.11 -34.79                        -0.49   GC            Mag
NGC 1854                         279.71 -34.31                                GC            Mag
LMC                              280.47 -32.89 -18.5  3000     50     -0.6    SBm V         Mag
NGC 2808                         282.19 -11.25  -9.4     2.1   11.1   -1.11   GC        OH  G-E (N)
Crater II        Crt II          282.91  42.03  -8.2  1066            -1.98   dSph          FLS
Sculptor I                       287.54 -83.16 -10.8   279     79     -1.68   dSph          FLS
E 3                              292.27 -19.02  -2.8     2.6    7.6   -0.83   GC            Hel? MD?
Hydra II         Hya II          295.61  30.46  -4.8    68    128     -2.02   UFD           Mag?
Hydrus I                         297.41 -36.74  -4.7    53.3          -2.52   UFD           Mag
M68              NGC 4590        299.63  36.05  -7.3     4.6   10.1   -2.06   GC        YH  Hel
Centaurus I      Cen I           300.26  21.90  -5.6    79    112.7   -1.8    UFD           
Rup 106                          300.89  11.67  -6.3     6.8   18.5   -1.49   GC        YH  Hel
NGC 4372                         300.99  -9.88  -7.8     6.6    7.1   -1.88   GC        BD  MD
NGC 362                          301.53 -46.25  -8.4     2.0    9.4   -1.09   GC        YH  G-E (R)
SMC              NGC 292         302.80 -44.30 -16.8  1000     57     -1.2    SBm V pec     Mag
NGC 4833                         303.61  -8.01  -8.2     4.6    7.0   -1.71   GC        OH  G-E
NGC 121                          305.71 -45.46          54            -1.71   GC            Mag
NGC 104          47 Tuc          305.90 -44.89  -9.4     3.7    7.4   -0.78   GC        BD  MD
IC 4499                          307.35 -20.47  -7.3     8.3   15.7   -1.60   GC        YH  Seq
NGC 5139         Omega Cen       309.10  14.97 -10.3     6.4    6.4   -1.35   GC            Seq (N) (R)
DES 1                            310.52 -67.83  -3.05    9.8          -1.98   GC        YH  
NGC 5286                         311.61  10.57  -8.6     2.2    8.4   -1.41   GC        OH  G-E
Tucana IV                        313.29 -55.29  -3.5   127            -2.49   UFD           Mag?
Tucana III                       315.15 -56.19  -2.4    44            -2.42   UFD           
Tucana V                         316.31 -51.89  -1.6    17            -2.17   UFD           Mag?
NGC 6101                         317.75 -15.82  -6.9     7.6   11.1   -1.76   GC        OH  Seq
AM 4                             320.15  33.54  -1.6     3.7   25.5   -0.97   GC        YH  Sag
Phenix II                        323.69 -59.75  -3.7    27                    UFD           Mag?
NGC 6362                         325.55 -17.57  -6.9     4.8    5.1   -0.99   GC        BD  MD
NGC 5927                         326.60   4.86  -7.8     2.5    4.5   -0.64   GC        BD  MD
NGC 5946                         327.58   4.19  -7.2     2.1    5.8   -1.22   GC        OH  Koa
Tucana II                        328.08 -52.33  -3.8   199            -2.23   UFD           Mag?
ESO 224-8        BH 176          328.41   4.34  -4.3     3.9    9.7   -0.13   GC        BD  MD
Lynga 7          BH 184          328.77  -2.79  -6.4     2.3    4.2   -0.64   GC        BD  MD
FSR 1716         VVV-CL005       329.78  -1.59  -1.5     3.5    4.3   -1.5    GC        OH  MD
NGC 5694                         331.06  30.36  -7.8     3.3   29.1   -1.74   GC        OH  HE G-E?
NGC 5824                         332.55  22.07  -8.8     3.4   25.8   -1.60   GC        OH  Sag Hel?
M53              NGC 5024        332.96  79.76  -8.7     5.8   18.3   -1.86   GC        OH  Hel
NGC 5053                         335.69  78.94  -6.7    16.7   16.9   -1.98   GC        OH  Hel
NGC 6752                         336.49 -25.63  -7.7     2.7    5.2   -1.24   GC        BD  MD
RLGC 1                           336.87   4.30  -8.3     4.6          -2.2    GC        OH  
NGC 5986                         337.02  13.27  -8.4     3.2    4.8   -1.35   GC        OH  Koa
NGC 6397                         338.17 -11.96  -6.6     1.6    6.0   -1.76   GC        BD  MD
Grus I                           338.68 -58.24  -3.4    70            -0.42   UFD           Mag?
FSR 1735                         339.19  -1.85  -6.5     0.8    2             GC            Koa
NGC 6352                         341.42  -7.17  -6.5     3.3    3.3   -0.70   GC        BD  MD
NGC 6584                         342.14 -16.41  -7.7     3.1    7.0   -1.30   GC        YH  HE G-E?
NGC 5634                         342.21  49.26  -7.7     4.0   21.2   -1.94   GC        OH  Hel G-E?
NGC 6139                         342.37   6.94  -8.4     2.4    3.6   -1.68   GC        OH  Koa
NGC 5897                         342.95  30.29  -7.2     7.6    7.3   -1.73   GC        OH  G-E
Terzan 3                         345.08   9.19  -4.6     2.8    2.4   -0.73   GC        BD  MD
NGC 6388                         345.56  -6.74  -9.4     2.0    3.2   -0.60   GC        BD  MB Seq?
ESO 280-SC06                     346.90 -12.57  -4.9     6.3   14.3   -2.00   GC            G-E
Kim 2                            347.17 -42.07  -1.5    12.8   99.4   -1.0    GC        YH  
Indus I                          347.3  -42.6   -3.5    12                    UFD           
NGC 6256                         347.79   3.31  -6.5     2.1    1.8   -0.70   GC        BD  Koa
NGC 6496                         348.02 -10.01  -7.2     6.3    4.3   -0.70   GC        BD  MD
FSR 1758                         349.22  -3.29  -8.6    10.0    3.7   -1.5    GC/UFD    BD  Seq (N)?
NGC 6541                         349.48 -11.09  -8.4     2.4    2.2   -1.53   GC        OH  Koa
NGC 6380         Ton 1           350.18  -3.42  -7.5     2.3    3.2   -0.50   GC        BD  MB
Ton 2            Pismis 26       350.80  -3.42  -6.1     2.5    1.4   -0.50   GC        BD  Koa
M4               NGC 6121        350.97  15.97  -7.2     2.3    5.9   -1.05   GC        OH  LE (R)
Grus II                          351.15 -51.94  -3.9    93            -2.51   UFD           Mag??
ESO 452-SC11     1636-283        351.91  12.10  -4.0     1.3    2.0   -1.50   GC        BD  MB
NGC 6144                         351.93  15.70  -6.7     4.0    2.6   -1.56   GC        OH  Koa (R)
FSR 1767                         352.61  -2.18  -4.7            7.0           GC            
M80              NGC 6093        352.67  19.46  -8.2     1.9    3.8   -1.47   GC        OH  Koa
NGC 6441                         353.53  -5.01  -9.6     2.2    3.9   -0.60   GC        BD  LE
M62              NGC 6266        353.57   7.32  -9.2     2.5    1.7   -1.02   GC        BD  MB
Boötes II        Boö II          353.7   68.9   -2.7    51     47.6   -1.79   UFD           Sag?
Indus II                         353.99 -37.40  -4.3   181            -2.0    UFD           
Liller 1                         354.84  -0.16  -7.6     1.3    1.8    0.22   GC        BD  MB
NGC 6453                         355.72  -3.87  -6.9     1.0    1.8   -1.53   GC        OH  Koa
VVV CL143                        355.78  -2.31                        -0.62   GC        BD  
NGC 6304                         355.83   5.38  -7.3     2.5    2.2   -0.66   GC        BD  MB
Terzan 4         HP 4            356.02   1.31  -6.1     0.6    1.3   -1.60   GC        BD  MB
Terzan 2         HP 3            356.32   2.30  -5.3     3.9    0.9   -0.40   GC        BD  MB
Djorg 1                          356.67  -2.48  -6.3     4.4    4.1   -2.00   GC            G-E
M19              NGC 6273        356.87   9.38  -9.2     3.1    1.6   -1.53   GC        OH  Koa
NGC 6316                         357.18   5.76  -8.3     2.3    3.2   -0.55   GC        BD  MB (R)
HP 1             BH 229          357.42   2.12  -6.4     6.2    6.1   -1.55   GC        BD  MB
Terzan 1         HP 2            357.56   0.99  -4.9     6.2    2.5   -1.30   GC        BD  MB
NGC 6293                         357.62   7.83  -7.8     2.3    1.4   -1.92   GC        BD  MB
Camargo 1107                     357.98   0.96  -6.6            4.3   -2.2    GC        OH  
Boötes I         Boötes I        358.08  69.62  -6.3   242     57.6   -2.55   UFD           
NGC 6284                         358.35   9.94  -8.0     3.5    7.6   -1.13   GC        OH  G-E
Camargo 1108                     358.40  -1.09  -8.4            5.0   -1.8    GC        OH  
Terzan 6         HP 5            358.57  -2.16  -7.7     1.2    1.6   -0.50   GC        BD  MB
NGC 6235                         358.92  13.52  -6.4     2.8    4.1   -1.18   GC        OH  G-E
VVV CL002                        359.56   0.89  -3.4     1.6    0.6   -0.4    GC            
NGC 6355                         359.58   5.43  -8.1     2.4    1.8   -1.50   GC        BD  MB

(1) Population (Mackey, van den Bergh 2005):
BD = Bulge/Disk
OH = Old Halo
YH = Young Halo

(2) Stream/Group (Forbes, Bridges 2010):
MD = Main Disk Group
MB = Main Bulge Group
Mag = Magellanic Stream
Sgr = Sagittarius Stream
CMa = Canis Major (Monoceros) Stream
FLS = Fornax-Leo-Sculptor Great Circle
G-E = Gaia-Enceladus 'Sausage'
Seq = Sequoia Group
Hel = Helmi Group
Koa = Koala Group

(R) = Retrograde Orbit
(N) = Suspected dwarf galaxy Nucleus

Links & References
Milky Way globular clusters and Satellite galaxies (SEDS)
Catalog of local volume galaxies
W.E. Harris (2003) Catalog of parameters for Milky Way globular clusters
Mike Irwin List of Local Group members

Zinn (1993) The Galactic Halo cluster systems: evidence for accretion, in Smith G. H., Brodie J. P., eds., ASP Conf. Ser. 48
Kroupa et al. (2004) The great disk of Milky-Way satellites and cosmological sub-structures. arXiv:astro-ph/0410.421v1
Mackey, van den Bergh (2005) The properties of globular cluster subsystems. arXiv:astro-ph/0504.4142
Martínez-Delgado (2006) Tracing stellar tidal streams in the Galactic Halo. [PDF]
Bica et al. (2007) FSR584 - a new globular cluster in the Galaxy? arXiv:astro-ph/0709.3315v1
Grillmayr (2008) Four new stellar debris streams in the Galactic Halo. arXiv:astro-ph/0811.3965v1
Catelan (2009) Horizontal branch stars: The interplay between observations and theory, and insights into the formation of the Galaxy. arXiv:astro-ph/0507.464v2
Forbes, Bridges (2010) Accreted versus in situ Milky Way globular clusters. arXiv:astro-ph/1001.4289v1
Minniti et al. (2010) Discovery of vvv cl001. A low-mass globular cluster next to UKS 1 in the direction of the Galactic Bulge. arXiv:astro-ph/1012.2450v1
Longmore et al. (2011) Mercer 5: a probable new globular cluster in the Galactic bulge, MNRAS, Vol 416, 1, pp. 456-478
Moni Bidin et al. (2011) Three Galactic globular cluster candidates. arXiv:astro-ph/1109.1854v1
Muñoz et al. (2012) The discovery of an ultra-faint star cluster in the constellation of Ursa Minor. arXiv:astro-ph/1204.5750v1
Balbinot et al. (2012) A new Milky Way halo star cluster in the Southern Galactic Sky. arXiv:astro-ph/1212.5952v1
Laevens et al. (2014) A new distant Milky Way globular cluster in the Pan-Starrs1 3pi survey. arXiv:astro-ph/1403.6593v1
Borissova et al. (2014) New galactic star clusters discovered in the VVV survey. Candidates projected on the inner disk and bulge. arXiv:astro-ph/1406.7051v1
Kim, Jerjen (2014) A hero's little horse: Discovery of a dissolving star cluster in Pegasus. arXiv:astro-ph/1411.3063v2
Kim et al. (2015) Discovery of a faint outer halo Milky Way star cluster in the southern sky. arXiv:astro-ph/1502.03952v1
Kim et al. (2015) A hero's dark horse: Discovery of an ultra-faint Milky Way satellite in Pegasus. arXiv:astro-ph/1503.08268v1
Kim et al. (2015) Horologium II: A second ultra-faint Milky Way satellite in the Horologium constellation. arXiv:astro-ph/1505.04948v2
Koposov et al. (2015) Beasts of the southern wild. Discovery of a large number of ultra faint satellites in the vicinity of the Magellanic Clouds. arXiv:astro-ph/1503.02079v1
Laevens et al. (2015) A new faint Milky Way satellite discovered in the Pan-Starrs1 3pi survey. arXiv:astro-ph/1503.05554v1
Martin et al. (2015) Hydra II: A faint and compact Milky Way dwarf galaxy found in the survey of the Magellanic stellar history. arXiv:astro-ph/1503.06216v2
Laevens et al. (2015) Sagittarius II, Draco II and Laevens 3: Three new Milky Way satellites discovered in the Pan-Starrs1 3pi survey. arXiv:astro-ph/1507.07564v1
Luque et al. (2015) Digging deeper into the Southern skies: A compact Milky-Way companion discovered in first-year Dark Energy Survey data. arXiv:astro-ph/1508.02381v1
Drlica-Wagner et al. (2015) Eight Ultra-faint Galaxy candidates discovered in year two of the Dark Energy Survey. arXiv:astro-ph/1508.03622v1
Torrealba et al. (2016) The feeble giant. Discovery of a large and diffuse Milky Way dwarf galaxy in the constellation of Crater. arXiv:astro-ph/1601.07178v3
Torrealba et al. (2016) At the survey limits: discovery of the Aquarius 2 dwarf galaxy in the VST ATLAS and the SDSS data. arXiv:astro-ph/1605.05338v2
Drlica-Wagner et al. (2016) An Ultra-faint Galaxy Candidate discovered in early data from the Magellanic Satellites Survey. arXiv:astro-ph/1609.03148v2
Luque et al. (2016) The Dark Energy Survey view of the Sagittarius stream: discovery of two faint stellar system candidates. arXiv:astro-ph/1608.04033v2
Koposov et al. (2017) Gaia 1 and 2. A pair of new satellites of the Galaxy. arXiv:astro-ph/1702.01122
Homma et al. (2017) Searches for new Milky Way satellites from the first two years of data of the Subaru/Hyper Suprime-Cam survey: discovery of Cetus III. arXiv:astro-ph/1703.05977v2
Torrealba et al. (2018) Discovery of two neighboring satellites in the Carina constellation with MagLiteS. arXiv:astro-ph/1801.07279v1
Koposov et al (2019) Snake in the Clouds: A new nearby dwarf galaxy in the Magellanic bridge. arXiv:astro-ph/1804.06430v1
Helmi et al. (2018) The merger that led to the formation of the Milky Way's inner stellar halo and thick disk. arXiv:astro-ph/1806.06038v2
Ryu, Lee (2018) Discovery of two new globular clusters in the Milky Way. arXiv:astro-ph/1808.03455v1
Barbá et al. (2018) A sequoia in the garden: FSR 1758 - dwarf galaxy or giant globular cluster? arXiv:astro-ph/1812.04999v1
Krujissen et al. (2018) The formation and assembly history of the Milky Way revealed by its globular cluster population. arXiv:astro-ph/1806.05680v2
Camargo, Minniti (2019) Three candidate globular clusters discovered in the Galactic bulge. arXiv:astro-ph/1901.08574v1
Mau et al. (2019) Two Ultra-Faint Milky Way Stellar Systems Discovered in Early Data from the DECam Local Volume Exploration Survey. arXiv:astro-ph/1912.03301v1
Massari et al. (2019)Origin of the system of globular clusters in the Milky Way. arXiv:astro-ph/1906.08271v2
Homma et al. (2019) Boötes IV: A New Milky Way Satellite Discovered in the Subaru Hyper Suprime-Cam Survey and Implications for the Missing Satellite Problem. arXiv:astro-ph/1906.07332v1
Marsakov et al. (2020) Globular Clusters of the Galaxy: Chemical Composition vs Kinematics. arXiv:astro-ph/2002.10692v1
Forbes et al. (2020) Reverse engineering the Milky Way. arXiv:astro-ph/2002.01512v1