Chi1 Fornacis
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Fornax |
| Right ascension | 03h 25m 55.84196s |
| Declination | −35° 55′ 15.1876″ |
| Apparent magnitude (V) | 6.39±0.01 |
| Characteristics | |
| Evolutionary stage | main sequence star |
| Spectral type | A1 IV |
| B−V color index | +0.08 |
| Astrometry | |
| Radial velocity (Rv) | 19.0±0.5 km/s |
| Proper motion (μ) | RA: +36.770 mas/yr Dec.: −4.641 mas/yr |
| Parallax (π) | 9.6154±0.0266 mas |
| Distance | 339.2 ± 0.9 ly (104.0 ± 0.3 pc) |
| Absolute magnitude (MV) | +1.42 |
| Details | |
| Mass | 2.05±0.08 M☉ |
| Radius | 2.20±0.11 R☉ |
| Luminosity | 31.24+3.43 −3.09 L☉ |
| Surface gravity (log g) | 4.08±0.07 cgs |
| Temperature | 8,770+122 −120 K |
| Metallicity [Fe/H] | 0.00+0.02 −0.04 dex |
| Rotational velocity (v sin i) | 136 km/s |
| Age | 5.5±0.5 Myr |
| Other designations | |
| χ1 For, 89 G. Fornacis, NSV 1162, CD−36°1290, CPD−36°350, GC 4097, HD 21573, HIP 15987, HR 1042, SAO 194289 | |
| Database references | |
| SIMBAD | For data |
Chi1 Fornacis, Latinised from χ1 Fornacis is a solitary white-hued star located in the southern constellation Fornax. It is barely visible to the naked eye with an apparent magnitude of 6.39, which is near the limit for naked eye visibility. Gaia DR3 parallax measurements imply a distance of 339 light-years and it is currently drifting away with a heliocentric radial velocity of 19.0 km/s. At its current distance, Chi1 Fornacis' brightness is diminshed by an interstellar extinction of 0.08 magnitudes and it has an absolute magnitude of +1.42.
Chi1 Fornacis has a stellar classification of A1 IV, indicating that it is a slightly evolved A-type star that is ceasing hydrogen fusion at its core. Alternatively, it has been given a class of A1 Vbn, indicating that it is instead a slightly less luminous A-type main-sequence star with broad or nebulous absorption lines due to rapid rotation. It has 2.05 times the mass of the Sun and 2.20 times the radius of the Sun. It radiates 31.24 times the luminosity of the Sun from its photosphere at an effective temperature of 8,870 K. Chi1 Fornacis has a solar metallicity and it is estimated to be only 5.5 million years old. It spins rapidly with a projected rotational velocity of 136 km/s.
It is the brightest star and titular member in the χ1 Fornacis cluster, a star cluster around 104 parsecs from Earth.