Table 2.
Positions, velocities, and orbital poles of the MW satellites considered in this work.
| Galaxy | Class. | x | y | z | Vx | Vy | Vz |
 |
 |
fVPOS |
|---|---|---|---|---|---|---|---|---|---|---|
| [kpc] | [km s−1] | [deg] | ||||||||
| Antlia II | Off | −19.6 | −128.9 | 25.8 | −97 ± 10 | −36 ± 2 | 61 ± 9 | 2.6 |
 |
0.0 |
| Aquarius II | ? | 28.7 | 53.2 | −86.1 | 103 ± 88 | 7 ± 77 | −9 ± 65 | 7.7 |
 |
0.29 |
| Bootes I | Off | 15.2 | −0.8 | 62.2 | 153 ± 10 | −97 ± 21 | 58 ± 4 | 16.4 |
 |
0.0 |
| Bootes II | Off | 6.9 | −1.6 | 38.9 | −336 ± 21 | −129 ± 23 | 1 ± 9 | 13.2 |
 |
0.0 |
| Bootes III | On | 1.7 | 6.9 | 45.3 | −10 ± 6 | −42 ± 21 | 259 ± 6 | 3.2 |
 |
1.0 |
| CanesVenatici I | ? | 2.6 | 35.9 | 207.7 | 10 ± 32 | 97 ± 34 | 64 ± 6 | 1.6 |
 |
0.87 |
| CanesVenatici II | ? | −15.8 | 18.6 | 158.8 | 60 ± 68 | −4 ± 79 | −92 ± 8 | 4.0 |
 |
0.4 |
| Carina | On | −25.1 | −96.5 | −39.9 | −29 ± 10 | −66 ± 7 | 175 ± 17 | 4.6 |
 |
1.0 |
| Carina II | Off | −8.2 | −34.6 | −10.6 | 122 ± 7 | −304 ± 5 | 156 ± 15 | 3.3 |
 |
0.0 |
| Carina III | On | −8.2 | −26.6 | −8.0 | 14 ± 6 | −161 ± 9 | 353 ± 28 | 6.9 |
 |
1.0 |
| Columba I | Off | −107.8 | −125.6 | −88.0 | 218 ± 62 | −116 ± 51 | −36 ± 53 | 27.6 |
 |
0.0 |
| ComaBerenices | Off | −10.2 | −4.2 | 42.1 | 254 ± 16 | −23 ± 16 | 92 ± 1 | 9.5 |
 |
0.0 |
| Crater I | ? | 0.4 | −97.2 | 107.7 | 37 ± 87 | 79 ± 47 | 59 ± 43 | 9.4 |
 |
0.54 |
| Crater II | On | 11.5 | −84.5 | 78.1 | 18 ± 13 | 127 ± 9 | 13 ± 9 | 15.4 |
 |
1.0 |
| Draco | On | −3.8 | 66.1 | 45.9 | 68 ± 9 | 4 ± 4 | −170 ± 6 | 9.8 |
 |
1.0 |
| Draco II | ? | −10.4 | 15.7 | 14.7 | 9 ± 10 | 88 ± 8 | −332 ± 9 | 31.2 |
 |
0.2 |
| Eridanus II | ? | −86.9 | −211.6 | −284.7 | −165 ± 207 | 48 ± 177 | 103 ± 121 | 9.5 |
 |
0.3 |
| Fornax | On | −39.6 | −48.3 | −126.9 | 15 ± 11 | −101 ± 19 | 77 ± 7 | 14.8 |
 |
1.0 |
| Grus I | ? | 53.6 | −24.2 | −107.8 | −66 ± 29 | 106 ± 44 | 158 ± 20 | 25.0 |
 |
0.65 |
| Grus II | On | 25.2 | −5.2 | −43.4 | −112 ± 9 | −150 ± 26 | 99 ± 7 | 27.9 |
 |
1.0 |
| Hercules | Off | 88.2 | 52.7 | 81.9 | 181 ± 20 | 92 ± 35 | −22 ± 22 | 38.0 |
 |
0.0 |
| Horologium I | On | −7.2 | −45.9 | −64.9 | 8 ± 16 | −143 ± 32 | 141 ± 23 | 1.3 |
 |
1.0 |
| Horologium II | ? | −14.3 | −45.4 | −63.2 | 68 ± 81 | −241 ± 68 | 140 ± 49 | 6.3 |
 |
0.78 |
| Hydra II | ? | 48.3 | −117.2 | 76.3 | −93 ± 90 | −130 ± 58 | 114 ± 64 | 29.5 |
 |
0.08 |
| Hydrus I | On | 2.0 | −19.6 | −16.5 | −157 ± 10 | −190 ± 19 | 282 ± 16 | 10.7 |
 |
1.0 |
| Leo I | ? | −130.0 | −126.8 | 204.1 | −115 ± 28 | −33 ± 27 | 136 ± 20 | 20.2 |
 |
0.28 |
| Leo II | ? | −71.7 | −54.2 | 200.2 | −55 ± 35 | 56 ± 33 | 21 ± 13 | 13.3 |
 |
0.27 |
| Leo IV | ? | −14.5 | −84.9 | 128.7 | 86 ± 107 | 10 ± 68 | 17 ± 45 | 2.9 |
 |
0.27 |
| Leo V | ? | −20.8 | −92.0 | 151.9 | 240 ± 174 | −84 ± 111 | 32 ± 70 | 1.3 |
 |
0.15 |
| Pegasus III( † ) | ? | 46.6 | 150.4 | −143.5 | / | / | / | 2.9 |
 |
0.34 |
| Phoenix II | On | 25.5 | −24.8 | −72.0 | −21 ± 17 | −256 ± 52 | 127 ± 17 | 18.9 |
 |
1.0 |
| Pisces II | ? | 14.8 | 122.4 | −134.1 | −277 ± 360 | −454 ± 173 | −367 ± 176 | 4.6 |
 |
0.69 |
| Reticulum II | On | −9.5 | −20.4 | −24.1 | 21 ± 4 | −114 ± 21 | 222 ± 18 | 11.8 |
 |
1.0 |
| Reticulum III | Off | −4.0 | −64.0 | −65.6 | 200 ± 111 | −110 ± 53 | −21 ± 56 | 3.0 |
 |
0.05 |
| Sagittarius II | Off | 52.2 | 20.7 | −27.1 | 23 ± 17 | −145 ± 32 | 192 ± 16 | 47.6 |
 |
0.0 |
| Sculptor | On | −5.3 | −9.5 | −83.4 | 17 ± 8 | 155 ± 8 | −94 ± 1 | 5.2 |
 |
1.0 |
| Segue 1 | ? | −19.2 | −9.5 | 17.7 | −133 ± 7 | −214 ± 35 | −57 ± 21 | 35.7 |
 |
0.71 |
| Segue 2 | Off | −31.5 | 13.8 | −21.1 | −108 ± 14 | 42 ± 16 | 74 ± 8 | 58.7 |
 |
0.0 |
| Sextans | Off | −35.9 | −56.1 | 57.1 | −197 ± 10 | 70 ± 6 | 73 ± 7 | 14.6 |
 |
0.0 |
| Triangulum II | Off | −28.4 | 16.4 | −11.4 | 227 ± 6 | −23 ± 6 | 195 ± 8 | 65.0 |
 |
0.0 |
| Tucana II | Off | 21.6 | −18.6 | −45.7 | −239 ± 18 | −100 ± 37 | 146 ± 7 | 24.6 |
 |
0.0 |
| Tucana III | ? | 0.9 | −9.0 | −19.1 | 28 ± 5 | 141 ± 10 | 184 ± 6 | 4.4 |
 |
0.77 |
| Tucana IV | On | 10.1 | −19.5 | −38.7 | 20 ± 10 | −119 ± 32 | 173 ± 17 | 15.2 |
 |
0.99 |
| Tucana V | Off | 16.3 | −23.5 | −43.4 | 85 ± 16 | 22 ± 27 | 213 ± 21 | 20.5 |
 |
0.0 |
| UrsaMajor I | Off | −60.9 | 20.0 | 79.4 | −85 ± 17 | −88 ± 27 | −41 ± 10 | 35.7 |
 |
0.0 |
| UrsaMajor II | Off | −32.5 | 12.7 | 21.2 | 174 ± 7 | −108 ± 23 | 215 ± 21 | 54.4 |
 |
0.0 |
| UrsaMinor | On | −22.0 | 52.3 | 53.8 | 10 ± 7 | 50 ± 5 | −157 ± 5 | 21.5 |
 |
1.0 |
| Willman 1 | Off | −27.5 | 7.6 | 32.0 | 88 ± 17 | 64 ± 35 | 80 ± 17 | 38.8 |
 |
0.0 |
| SMC | On | 16.6 | −38.5 | −44.8 | 9 ± 9 | −195 ± 21 | 170 ± 16 | 20.2 |
 |
1.0 |
| LMC | On | −0.5 | −41.8 | −27.5 | −40 ± 9 | −227 ± 16 | 222 ± 23 | 6.8 |
 |
1.0 |
Notes. Column 2 indicates if the dwarf galaxies listed in Col. 1 are classified either as on-plane (On), off-plane (Off) or have an uncertain classification (?); Cols. 3–7 show the calculated Galactocentric positions and velocities in Cartesian projection needed to determine the orbital pole directions; Cols. 8–9 show the best-possible (‘predicted’) and measured angular separation between the satellites orbital plane and the VPOS orientation, while in Col. 10 is shown the fraction of Monte Carlo realisations of the orbital poles that fall within the 10% sky area encircling the VPOS location. Galaxy names in italics indicate those systems for which 
(see Sect. 2), while in boldface are marked those systems likely associated with the LMC. ( † ) The systemic proper motion of Pegasus III is too uncertain to obtain a velocity vector with meaningful values.
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