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Table 2.
Proper motion in the sky plane.
| Object | Method |  |
 |
Ref. |
|---|---|---|---|---|
| μas yr−1 | μas yr−1 | |||
| M31-a | Satellite kinematics | −27 ± 11 | −12 ± 10 | (1) |
| M31-b | HST star fields | −45 ± 13 | −32 ± 12 | (2) |
| M31-c | Weighted mean a+b | −34 ± 9 | −20 ± 8 | (2) |
| M31-d | Stars Gaia DR2 | −65 ± 24 | −57 ± 22 | (3) |
| M31-e | Weighted mean b+d | −49 ± 11 | −38 ± 11 | (3) |
| M31-f | Stars Gaia EDR3 blue | −49 ± 11 | −37 ± 8 | (4) |
| M33-g | Water masers IC133 | −21 ± 8 | 6 ± 9 | (5,6) |
| M33-h | Water masers M33/19 | −25 ± 8 | −2 ± 9 | (5,6) |
| M33-i | Weighted mean h+g | −23 ± 6 | 2 ± 6 | (5,6) |
| M33-j | Stars Gaia DR2 | −31 ± 25 | −29 ± 17 | (3) |
| M33-k | Weighted mean i+j | −23 ± 6 | −1 ± 6 | (5,6,3) |
References. (1) van der Marel & Guhathakurta (2008); (2) Sohn et al. (2012); (3) van der Marel et al. (2019); (4) Salomon et al. (2021); (5) Brunthaler et al. (2005); (6) Corbelli et al. (2014).
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