Chi2 Fornacis
Star in the constellation Fornax
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Chi2 Fornacis, Latinized from χ2 Fornacis, is a solitary star[15] located in the southern constellation Fornax, the furnace. It is faintly visible to the naked eye as an orange-hued point of light with an apparent magnitude of 5.70. Gaia DR3 parallax measurements imply a distance of 476 light-years and it is currently receding with a heliocentric radial velocity of approximately 30 km/s.[6] At its current distance, Chi2 Fornacis' brightness is diminished by an interstellar extinction of 0.11 magnitudes[16] and it has an absolute magnitude of 0.00.[7]
 | |
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Fornax |
| Right ascension | 03h 27m 33.42119s[1] |
| Declination | −35° 40′ 52.7728″[1] |
| Apparent magnitude (V) | 5.70±0.01[2] |
| Characteristics | |
| Spectral type | K2 III[3] |
| B−V color index | +1.29[4] |
| Variable type | suspected[5] |
| Astrometry | |
| Radial velocity (Rv) | 30.0±4.3[6] km/s |
| Proper motion (μ) | RA: +77.064 mas/yr[1] Dec.: +5.989 mas/yr[1] |
| Parallax (π) | 6.8558±0.0446 mas[1] |
| Distance | 476 ± 3 ly (145.9 ± 0.9 pc) |
| Absolute magnitude (MV) | 0.00[7] |
| Details | |
| Mass | 1.18[8] M☉ |
| Radius | 23.58±1.19[9] R☉ |
| Luminosity | 194+4 −3[1] L☉ |
| Surface gravity (log g) | 1.83[8] cgs |
| Temperature | 4,477±122[10] K |
| Metallicity [Fe/H] | +0.02[11] dex |
| Rotational velocity (v sin i) | <1.0[12] km/s |
| Other designations | |
| χ2 For, 91 G. Fornacis[13], NSV 15697, CD−36°1306, CPD−36°355, FK5 2244, GC 4129, HD 21574, HIP 16112, HR 1054, SAO 194312, TIC 142889216[14] | |
| Database references | |
| SIMBAD | data |
Chi2 Fornacis is an old-disk star[11] and it has a stellar classification of K2 III.[3] The class indicates that it is an evolved K-type giant that has ceased hydrogen fusion at its core and left the main sequence. It has 118% the mass of the Sun[8] but it has expanded to 23.58 times the radius of the Sun.[9] It radiates 194 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 4,477 K.[10] Chi2 Fornacis is slightly metal enriched with a near-solar iron abundance of [Fe/H] = +0.02.[11] It spins too slowly for its projected rotational velocity to be measured accurately, having a projected rotational velocity lower than 1.0 km/s.[12]
The star was observed to be variable in infrared light during a 1991 IRAS survey for galaxy clusters.[17] However, its variability in optical light is unknown. In addition, subsequent observations have not confirmed the variability in infrared and optical light.[18] The lenticular galaxy NGC 1380 lies 2 degrees north-northeast of Chi2 Fornacis.[19]