The Milky Way Halo

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 226 companions, 170 GCs, 32 satellite galaxies and 24 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. To enjoy the view at full browser width, click on the "Make Full Width" button. The source for the underlying map can be found at my Github repository.

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Bulge & Disk
Old Halo
Young Halo
Magellanic Stream
Sagittarius Stream
Canis Major(Monoceros) Stream
Fornax-Leo-Sculptor Stream
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 core of the CMa dwarf, 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.Ctr.      0      0    -20.9          460             SABbc I-II    
NGC 6723                 0.07 -17.30  -7.8     4.1    2.6   -0.96   GC        OH  
NGC 6287                 0.13  11.02  -7.4     2.0    2.1   -1.91   GC        OH  
NGC 6558                 0.20  -6.02  -6.5     3.5    1.0   -1.44   GC        OH  
NGC 6569                 0.48  -6.68  -8.3     4.1    2.9   -0.86   GC        OH  
Palomar 5                0.85  45.86  -5.2    20.0   18.6   -1.24   GC        YH  
NGC 6325                 0.97   8.00  -6.9     2.2    1.1   -1.17   GC        OH  
NGC 6522                 1.02  -3.93  -7.7     2.4    0.6   -1.44   GC        OH  
NGC 6528                 1.14  -4.17  -6.6     1.0    0.6   -0.04   GC        BD  
NGC 6652                 1.53 -11.38  -6.7     1.9    2.8   -0.97   GC        OH  
M69          NGC 6637    1.72 -10.27  -7.6     2.2    1.9   -0.78   GC        BD  
Palomar 6                2.09   1.78  -6.8     1.8    2.2   -1.09   GC        YH  
Djorg 2      ESO456-SC3  2.76  -2.51  -7.0     1.6    1.4   -0.50   GC        BD  
NGC 6624                 2.79  -7.91  -7.5     1.9    1.2   -0.70   GC        BD  
M70          NGC 6681    2.85 -12.51  -7.1     2.4    2.1   -1.35   GC        OH  
NGC 6540     Djorg 3     3.29  -3.31  -5.4     0.3    4.4   -1.20   GC        OH  
BH 261       AL 3        3.36  -5.27  -4.0     1.0    2.1   -1.3    GC            
M107         NGC 6171    3.37  23.01  -7.1     5.0    3.3   -0.95   GC        OH  
Terzan 7                 3.39 -20.07  -5.0     6.6   16.0   -0.58   GC        YH  Sgr
NGC 6401                 3.45   3.98  -7.9     5.8    2.7   -0.98   GC        OH  
Terzan 9                 3.60  -1.99  -3.8     1.5    1.6   -2.00   GC        YH  
Terzan 5     Terzan 11   3.84   1.69  -7.9     2.5    2.5    0.00   GC        BD  (N)
M5           NGC 5904    3.86  46.80  -8.8     4.6    6.2   -1.12   GC        OH  
Terzan 10                4.42  -1.86  -6.3     2.2    2.4   -0.70   GC        BD  
NGC 6342                 4.90   9.73  -6.4     2.2    1.7   -0.69   GC        BD  
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  
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  
Sgr I        SagDEG      5.57 -14.16 -13.8  1550     16.0   -0.5    dSph(t)       Sgr
M54          NGC 6715    5.61 -14.09 -10.0     3.8   19.2   -1.25   GC        YH  Sgr (N)
Terzan 8                 5.76 -24.56  -5.0     7.6   19.1   -1.80   GC        OH  Sgr
NGC 6544                 5.84  -2.20  -6.7     1.4    5.3   -1.20   GC        OH  
NGC 6356                 6.72  10.22  -8.5     3.3    7.6   -0.50   GC        BD  
NGC 6440                 7.73   3.80  -8.7     1.4    1.3   -0.34   GC        BD  
M28          NGC 6626    7.80  -5.58  -8.2     2.5    2.7   -1.45   GC        OH  
NGC 6638                 7.90  -7.15  -7.1     1.8    2.3   -0.99   GC        OH  
Terzan 12                8.36  -2.10  -4.1     1.2    3.4   -0.50   GC        BD  
Arp 2                    8.55 -20.78  -5.3    15.9   21.4   -1.45   GC        YH  Sgr
M55          NGC 6809    8.80 -23.27  -7.5     4.5    5.3   -1.81   GC        OH  
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  
M22          NGC 6656    9.89  -7.55  -8.5     3.0    4.9   -1.49   GC        OH  
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  
Palomar 8               14.10  -6.80  -5.5     2.1    5.6   -0.48   GC        BD  
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  
M12          NGC 6218   15.72  26.31  -7.3     3.1    4.5   -1.14   GC        OH  
IC 1257                 16.53  15.15  -6.2     3.2   17.9   -1.70   GC        OH  
NGC 6366                18.41  16.04  -5.8     2.8    5.0   -0.73   GC        OH  
Palomar 15              18.87  24.30  -5.5    15.7   37.9   -1.90   GC        OH  FLS
Sgr II       Laevens 5  18.9  -22.9   -5.2    38     60     -2.2    GC/UFD        Sgr?
NGC 6517                19.23   6.76  -8.3     2.0    4.3   -1.37   GC        OH  
M75          NGC 6864   20.30 -25.75  -8.5     2.8   14.8   -1.03   GC        OH  FLS
NGC 6539                20.80   6.78  -8.3     4.1    3.1   -0.66   GC        BD  
M14          NGC 6402   21.32  14.81  -9.1     3.5    4.1   -1.39   GC        OH  
IC 1276      Palomar 7  21.83   5.67  -6.7     3.7    3.7   -0.73   GC        BD  
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  (R)
NGC 6535                27.18  10.44  -4.7     1.5    3.9   -1.51   GC        OH  
M30          NGC 7099   27.18 -46.83  -7.4     2.7    7.1   -1.92   GC        OH  (R)
Boö III                 27.39  55.43  -5.8   170     44.0   -2.1    UFD?          
NGC 6426                28.09  16.23  -6.7     5.8   14.6   -2.11   GC        YH  FLS
Her I                   28.73  36.87  -6.2   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              30.51 -47.68  -4.5     7.1   15.9   -0.83   GC        YH  Sgr
GLIMPSE-C01             31.30  -0.10  -5.9     0.6    2.0   -1.61   GC            
Palomar 11              31.81 -15.58  -6.9     5.6    7.9   -0.39   GC        BD  
M72          NGC 6981   35.16 -32.68  -7.0     4.4   12.9   -1.21   GC        YH  
NGC 6760                36.11  -3.92  -7.9     4.7    4.8   -0.52   GC        BD  
NGC 6749                36.20  -2.20  -6.7     2.5    5.0   -1.60   GC        OH  
NGC 5466                42.15  73.59  -7.0    10.4   16.2   -2.20   GC        YH  (R)
M3           NGC 5272   42.21  78.71  -8.9     3.4   12.2   -1.34   GC        YH  
NGC 6934                52.10 -18.89  -7.5     2.7   12.8   -1.32   GC        YH  (R)
Palomar 10              52.44   2.72  -5.8     1.7    6.4   -0.10   GC        BD  
M2           NGC 7089   53.38 -35.78  -9.0     3.1   10.4   -1.31   GC        OH  (R)
NGC 7492                53.39 -63.48  -5.8     9.2   24.9   -1.41   GC        OH  
M71          NGC 6838   56.74  -4.56  -5.6     1.9    6.7   -0.73   GC        BD  
M13          NGC 6205   59.01  40.91  -8.7     3.3    8.7   -1.33   GC        OH  (R)
M56          NGC 6779   62.66   8.34  -7.4     3.4    9.7   -2.00   GC        OH  (R)
Laevens 3               63.6  -21.2   -4.4     7     64     -1.9    GC        YH  
NGC 7006                63.77 -19.41  -7.7     4.6   38.8   -1.63   GC        YH  
M15          NGC 7078   65.01 -27.31  -9.2     3.2   10.4   -2.02   GC        YH  
M92          NGC 6341   68.34  34.86  -8.2     2.6    9.6   -2.16   GC        OH  
Kim 1                   68.51 -38.43   0.3     6.0          -1.7    GC            
Segue 3                 69.4  -21.27  -1.2     3.0          -0.8    GC/UFD    YH  
Peg III                 69.85 -41.81  -4.1    78            -2.1    GC/UFD        
NGC 6229                73.64  40.31  -8.0     3.3   29.7   -1.43   GC        YH  
CVn I                   74.31  79.82  -7.9   564    219.8   -1.98   dSph          FLS
Balbinot 1              75.18 -32.64  -1.2     7.2          -1.58   GC        OH  
Psc II                  79.21 -47.11  -5.0    60    180             UFD           
Dra I        DDO 208    86.37  34.72  -8.6   196     82     -1.93   dSph pec      Mag
Palomar 13              87.10 -42.70  -3.7     3.5   26.7   -1.74   GC        YH  Mag (R)
Dra II       Laevens 4  98.3   42.9   -2.9    19     22     -2.2    GC/UFD        
UMi I        DDO 199   104.97  44.80  -8.9   280     68.0   -2.13   dSph          Mag
Muñoz 1                105.44  45.48  -0.4     7.1          -1.5    GC            
CVn II                 113.58  82.70  -4.8    74    150.7   -2.21   UFD           FLS
Palomar 1              130.07  19.03  -2.5     2.2   17.0   -0.70   GC        BD  CMa?
Gaia II                132.15  -8.74  -2.0     3            -1.0    GC            
Tri II       Laevens 2 141.4  -23.4   -1.8    34     36     -2.2    GC/UFD        TriAnd?
Segue 2                149.4  -38.1   -2.5    34     38.0   -2.0    GC/UFD        Sgr? TriAnd?
NGC 288                152.28 -89.38  -6.7     5.7   12.0   -1.14   GC        OH  (R)
UMa II                 152.46  37.44  -4.2   140     36.5   -2.47   UFD           
Cet II                 156.48 -78.53   0.0    17                    GC/UFD        
Willman 1              158.58  56.78  -3.0    25     43             GC/UFD        
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            Sgr
Palomar 2              170.53  -9.07  -8.0     5.4   35.4   -1.30   GC        YH  Sgr?
NGC 2419               180.37  25.24  -9.6    17.9   91.5   -2.14   GC        OH  (N)
Koposov 2              195.11  25.55  -0.4     1.8   26.3   -0.6    GC        YH  Sgr?
Palomar 4              202.31  71.80  -3.1    17.2  111.8   -1.07   GC        YH  FLS
Leo T                  214.85  43.66  -7.1   178    425     -1.99   UFD           
Eri I                  218.11 -41.33  -5.1    10.5   95.2   -1.20   GC        YH  FLS
Leo II       DDO 93    220.17  67.23 -10.1   151    208     -1.62   dSph pec      FLS
Segue 1                220.5   50.4   -3.0    29     25             GC/UFD        FLS? Sgr?
Hydra I                224.7   29.1   -2.5                  -0.91   GC/UFD        CMa?
Leo I        DDO 74    225.99  49.11 -11.9   246    254     -1.43   dSph          FLS
M79          NGC 1904  227.23 -29.35  -7.9     3.0   18.8   -1.37   GC        OH  CMa
Gaia I                 227.34  -8.75  -5.1     9            -0.7    GC        YH  
Col I                  231.62 -28.88  -4.5   103                    UFD           
For I        ESO 356-4 237.10 -65.65 -13.1   668    140     -0.99   dSph          FLS Mag?
CMa I                  239.99  -8.00  -8.3            8.0           dIrr          CMa
Palomar 3              240.14  41.86  -5.7    17.8   95.9   -1.39   GC        YH  FLS
Coma I                 241.9   83.6   -3.7    77     45.2   -2.6    GC/UFD        FLS Sgr?
Sex I                  243.50  42.27  -9.5   682     89     -1.93   dSph          FLS
NGC 1851               244.51 -35.04  -8.3     1.8   16.7   -1.03   GC        OH  CMa
NGC 2298               245.63 -16.01  -6.3     2.4   15.7   -1.71   GC        OH  CMa
Eri II                 249.78 -51.65  -6.6   172            -1.5    UFD           Mag?
NGC 4147               252.85  77.19  -6.2     2.4   21.3   -1.5    GC        YH  Sgr?
Pic I                  257.30 -40.65  -3.1    31            -1.7    GC/UFD        
AM 1         E1        258.36 -48.47  -4.73   15.2  124.6   -1.70   GC        YH  FLS
Car I                  260.11 -22.22  -9.4   241    103     -2.0    dSph          Mag
Koposov 1              260.98  70.76  -4.3     3.0   36.3   -0.6    GC        YH  Sgr?
Pyxis                  261.32   7.00  -5.7    15.6   41.7   -1.30   GC        YH  
Leo V                  261.86  58.54  -4.3    42    180.8           UFD           FLS?
Hor II                 262.47 -54.14  -2.6    47            -2.1    GC/UFD        
Leo IV                 265.44  56.51  -5.8   116    160.6   -2.54   UFD           FLS
Ret II                 266.30 -49.74  -2.7    32            -1.8    GC/UFD        Mag?
NGC 1261               270.54 -52.13  -7.8     3.6   18.2   -1.08   GC        YH  FLS
Hor I                  271.39 -54.73  -3.4    30            -1.6    GC/UFD        Mag?
Phe I        ESO 245-7 272.16 -68.95  -9.8          445     -1.9    IAm V-VI      
Ret III                273.88 -45.65  -3.3    64                    GC/UFD        Mag?
Laevens 1    Crater    274.8   47.8   -5.3    19.4  145     -1.9    GC        YH  
Eri III                274.96 -59.60  -2.0    18                    GC/UFD        Mag?
Virgo I                276.94  59.58  -0.8    38            -2.2    GC/UFD        
NGC 3201               277.23   8.64  -7.5     3.9    8.9   -1.24   GC        YH  (R)
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  CMa (N)
Crater II              282.91  42.03  -8.2  1066            -1.7    dSph          FLS
Scl I                  287.54 -83.16  -9.8   260     79     -1.68   dSph          FLS
E 3                    292.27 -19.02  -2.8     2.6    7.6   -0.83   GC            
Hydra II               295.61  30.46  -4.8    68    128     -2.2    UFD           Mag?
M68          NGC 4590  299.63  36.05  -7.3     4.6   10.1   -2.06   GC        YH  CMa?
Rup 106                300.89  11.67  -6.3     6.8   18.5   -1.49   GC        YH  CMa?
NGC 4372               300.99  -9.88  -7.8     6.6    7.1   -1.88   GC        OH  
NGC 362                301.53 -46.25  -8.4     2.0    9.4   -1.09   GC        YH  (R)
SMC          NGC 292   302.80 -44.30 -17.1  1000     57     -1.2    SBm V pec     Mag
NGC 4833               303.61  -8.01  -8.2     4.6    7.0   -1.71   GC        OH  
NGC 104      47 Tuc    305.90 -44.89  -9.4     3.7    7.4   -0.78   GC        BD  
IC 4499                307.35 -20.47  -7.3     8.3   15.7   -1.60   GC        YH  
NGC 5139     Omega Cen 309.10  14.97 -10.3     6.4    6.4   -1.35   GC            (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  
Tuc IV                 313.29 -55.29  -3.5   127            -2.3    UFD           Mag?
Tuc III                315.15 -56.19  -2.4    44            -2.3    GC/UFD        Mag?
Tuc V                  316.31 -51.89  -1.6    17            -1.8    GC/UFD        Mag?
NGC 6101               317.75 -15.82  -6.9     7.6   11.1   -1.76   GC        OH  
AM 4                   320.15  33.54  -1.6     3.7   25.5   -0.97   GC            Sgr?
Phe II                 323.69 -59.75  -2.8    27                    GC/UFD        Mag?
NGC 6362               325.55 -17.57  -6.9     4.8    5.1   -0.99   GC        OH  
NGC 5927               326.60   4.86  -7.8     2.5    4.5   -0.64   GC        BD  
NGC 5946               327.58   4.19  -7.2     2.1    5.8   -1.22   GC        OH  
Tuc II                 328.08 -52.33  -4.4   199                    UFD           Mag?
BH 176                 328.41   4.34  -4.3     3.9    9.7   -0.13   GC        BD  
Lynga 7      BH 184    328.77  -2.79  -6.4     2.3    4.2   -0.64   GC        BD  
NGC 5694               331.06  30.36  -7.8     3.3   29.1   -1.74   GC        OH  
NGC 5824               332.55  22.07  -8.8     3.4   25.8   -1.60   GC        OH  
M53          NGC 5024  332.96  79.76  -8.7     5.8   18.3   -1.86   GC        OH  FLS
NGC 5053               335.69  78.94  -6.7    16.7   16.9   -1.98   GC        YH  FLS Sgr?
NGC 6752               336.49 -25.63  -7.7     2.7    5.2   -1.24   GC        OH  
NGC 5986               337.02  13.27  -8.4     3.2    4.8   -1.35   GC        OH  
NGC 6397               338.17 -11.96  -6.6     1.6    6.0   -1.76   GC        OH  
Grus I                 338.68 -58.24  -3.4    70                    GC/UFD        
FSR 1735               339.19  -1.85  -6.5     0.8    2             GC            
NGC 6352               341.42  -7.17  -6.5     3.3    3.3   -0.70   GC        BD  
NGC 6584               342.14 -16.41  -7.7     3.1    7.0   -1.30   GC        YH  
NGC 5634               342.21  49.26  -7.7     4.0   21.2   -1.94   GC        OH  Sgr
NGC 6139               342.37   6.94  -8.4     2.4    3.6   -1.68   GC        OH  
NGC 5897               342.95  30.29  -7.2     7.6    7.3   -1.73   GC        OH  
Terzan 3               345.08   9.19  -4.6     2.8    2.4   -0.73   GC        BD  
NGC 6388               345.56  -6.74  -9.4     2.0    3.2   -0.60   GC        BD  
ESO280-SC06            346.90 -12.57  -4.9     6.3   14.3   -2.00   GC            
Kim 2                  347.17 -42.07  -1.5    12.8   99.4   -1.0    GC        YH  
NGC 6256               347.79   3.31  -6.5     2.1    1.8   -0.70   GC        BD  
NGC 6496               348.02 -10.01  -7.2     6.3    4.3   -0.70   GC        BD  
NGC 6541               349.48 -11.09  -8.4     2.4    2.2   -1.53   GC        OH  
NGC 6380     Ton 1     350.18  -3.42  -7.5     2.3    3.2   -0.50   GC        BD  
Ton 2        Pismis 26 350.80  -3.42  -6.1     2.5    1.4   -0.50   GC        BD  
M4           NGC 6121  350.97  15.97  -7.2     2.3    5.9   -1.05   GC        OH  (R)
Grus II                351.15 -51.94  -3.9    93            -2.0    UFD           Mag?
ESO452-SC11  1636-283  351.91  12.10  -4.0     1.3    2.0   -1.50   GC        YH  
NGC 6144               351.93  15.70  -6.7     4.0    2.6   -1.56   GC        OH  (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  
NGC 6441               353.53  -5.01  -9.6     2.2    3.9   -0.60   GC        BD  
M62          NGC 6266  353.57   7.32  -9.2     2.5    1.7   -1.02   GC        OH  
Boö II                 353.7   68.9   -3.1    51     47.6   -2.0    GC/UFD        Sgr?
Indus I                353.99 -37.40  -4.3   181            -2.0    GC/UFD        
Liller 1               354.84  -0.16  -7.6     1.3    1.8    0.22   GC        BD  
NGC 6453               355.72  -3.87  -6.9     1.0    1.8   -1.53   GC        OH  
NGC 6304               355.83   5.38  -7.3     2.5    2.2   -0.66   GC        BD  
Terzan 4     HP 4      356.02   1.31  -6.1     0.6    1.3   -1.60   GC        OH  
Terzan 2     HP 3      356.32   2.30  -5.3     3.9    0.9   -0.40   GC        BD  
Djorg 1                356.67  -2.48  -6.3     4.4    4.1   -2.00   GC            
M19          NGC 6273  356.87   9.38  -9.2     3.1    1.6   -1.53   GC        OH  
NGC 6316               357.18   5.76  -8.3     2.3    3.2   -0.55   GC        BD  (R)
HP 1         BH 229    357.42   2.12  -6.4     6.2    6.1   -1.55   GC        OH  
Terzan 1     HP 2      357.56   0.99  -4.9     6.2    2.5   -1.30   GC        YH  
NGC 6293               357.62   7.83  -7.8     2.3    1.4   -1.92   GC        OH  
Boö I                  358.08  69.62  -5.7   242     57.6   -2.5    UFD           
NGC 6284               358.35   9.94  -8.0     3.5    7.6   -1.13   GC        OH  
Terzan 6     HP 5      358.57  -2.16  -7.7     1.2    1.6   -0.50   GC        BD  
NGC 6235               358.92  13.52  -6.4     2.8    4.1   -1.18   GC        OH  
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        OH  

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

(2) Stream (Forbes, Bridges 2010):
Mag = Magellanic Stream
Sgr = Sagittarius Stream
CMa = Canis Major (Monoceros) Stream
FLS = Fornax-Leo-Sculptor Great Circle

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

Links & References
Older versions of the chart
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]
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
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
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
Koposov et al. (2017) Gaia 1 and 2. A pair of new satellites of the Galaxy. arXiv:astro-ph/1702.01122