HD 17943
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Eridanus |
| Right ascension | 02h 52m 50.74s |
| Declination | −09° 26′ 28.4″ |
| Apparent magnitude (V) | 6.325 |
| Characteristics | |
| Evolutionary stage | main-sequence star |
| Spectral type | A4V |
| Astrometry | |
| Radial velocity (Rv) | 38.07±0.28 km/s |
| Proper motion (μ) | RA: +109.825 mas/yr Dec.: +40.094 mas/yr |
| Parallax (π) | 10.6465±0.0374 mas |
| Distance | 306 ± 1 ly (93.9 ± 0.3 pc) |
| Absolute magnitude (MV) | 1.37 |
| Details | |
| Mass | 1.8 M☉ |
| Radius | 2.6 R☉ |
| Luminosity | 21 L☉ |
| Surface gravity (log g) | 3.88 cgs |
| Temperature | 7,749 K |
| Metallicity [Fe/H] | −0.01 dex |
| Rotational velocity (v sin i) | 134 km/s |
| Age | 735 Myr |
| Other designations | |
| BD−10 569, HD 17943, HIP 13421, HR 859, SAO 130160, TYC 5286-1109-1, 33 G. Eridani | |
| Database references | |
| SIMBAD | data |
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.
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.