HD 17943
High proper-motion star in Eridanus
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HD 17943, or HR 859, is a high proper-motion star in the constellation of Eridanus. It has an apparent magnitude of 6.325. Based on parallax measurements from the Gaia spacecraft, it is at a distance of 306 light-years (94 parsecs). It belongs to spectral class A4V.
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Eridanus[1] |
| Right ascension | 02h 52m 50.74s[2] |
| Declination | −09° 26′ 28.4″[2] |
| Apparent magnitude (V) | 6.325[3] |
| Characteristics | |
| Evolutionary stage | main-sequence star[4] |
| Spectral type | A4V[5] |
| Astrometry | |
| Radial velocity (Rv) | 38.07±0.28[2] km/s |
| Proper motion (μ) | RA: +109.825 mas/yr[2] Dec.: +40.094 mas/yr[2] |
| Parallax (π) | 10.6465±0.0374 mas[2] |
| Distance | 306 ± 1 ly (93.9 ± 0.3 pc) |
| Absolute magnitude (MV) | 1.37[1] |
| Details | |
| Mass | 1.8[6] M☉ |
| Radius | 2.6[6] R☉ |
| Luminosity | 21[6] L☉ |
| Surface gravity (log g) | 3.88[6] cgs |
| Temperature | 7,749[6] K |
| Metallicity [Fe/H] | −0.01[7] dex |
| Rotational velocity (v sin i) | 134[4] km/s |
| Age | 735[7] Myr |
| Other designations | |
| BD−10 569, HD 17943, HIP 13421, HR 859, SAO 130160, TYC 5286-1109-1,[8] 33 G. Eridani[9] | |
| Database references | |
| SIMBAD | data |
This star is incorrectly called by the Bayer designation Sigma Eridani in the 1991 edition of the Bright Star Catalogue. Bayer's Sigma Eridani is in fact non-existent; he assigned this designation to a 4th-magnitude-star near Eta Eridani, on the opposite side to Rho Eridani, but no naked-eye star is found in that position in modern star atlases.[10][11][12]