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Table 5.
Astrometry and radial velocity of Achernar and 2MASS J01375879−5645447 (Gaia EDR3 4911252913514571648).
| Parameter (ICRS) | Value | Epoch | Reference | |
|---|---|---|---|---|
| Achernar position | (α, δ)AB | (01:37:43.01696, −57:14:12.9219) ±(5.1, 4.4) mas | 1991.25 | 1 |
| Achernar parallax | ϖAB | 23.39 ± 0.57 mas | 1991.25 | 1 |
| Achernar PM | μAB | ( + 87.00 ± 0.58, −38.24 ± 0.50) mas a−1 | 1991.25 | 1 |
| Achernar RV | vR, AB | +10.5 ± 0.5 km s−1 | 2013 | 2 |
| 2M position | (α, δ)2M | (01:37:58.97272, −56:45:45.3427) ±(0.014, 0.014) mas | 2016.0 | 3 |
| 2M parallax | ϖAB | 22.246 ± 0.020 mas | 2016.0 | 3 |
| 2M PM | μ2M | ( + 92.992 ± 0.017, −32.009 ± 0.018),mas a−1 | 2016.0 | 3 |
| 2M RV | vR, 2M | +8.5 ± 0.6 km s−1 | 2012.5 | 4 |
References. (1) van Leeuwen (2007a); (2) Present work; (3) Gaia Collaboration (2021); (4) Kraus et al. (2014).
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