HD 17943

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.

HD 17943

Location of HD 17943 (circled)
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]