HD 88231, also known as HR 3993, is a solitary orange-hued star located in the northern constellation Leo Minor. It has an apparent magnitude of 5.84,[2] making it faintly visible to the naked eye under ideal conditions. Gaia DR3 parallax measurements imply a distance of about 569 light-years,[1] and the object is currently receding with a heliocentric radial velocity of 7.38 km/s.[7] At its current distance, HD 88231's brightness is diminished by 0.17 magnitudes due to interstellar extinction[14] and it has an absolute magnitude of −0.59.[8]
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Leo Minor |
| Right ascension | 10h 11m 12.77777s[1] |
| Declination | +37° 24′ 06.8383″[1] |
| Apparent magnitude (V) | 5.84[2] (5.79 - 5.88)[3] |
| Characteristics | |
| Spectral type | K3 III[4] |
| B−V color index | +1.29[5] |
| Variable type | suspected[6] |
| Astrometry | |
| Radial velocity (Rv) | 7.38±0.22[7] km/s |
| Proper motion (μ) | RA: −20.679 mas/yr[1] Dec.: −29.496 mas/yr[1] |
| Parallax (π) | 5.7353 ± 0.0663 mas[1] |
| Distance | 569 ± 7 ly (174 ± 2 pc) |
| Absolute magnitude (MV) | −0.59[8] |
| Details | |
| Mass | 1.17[9] M☉ |
| Radius | 24.9±1.3[10] R☉ |
| Luminosity | 228±5[1] L☉ |
| Surface gravity (log g) | 1.76+0.10 −0.06[11] cgs |
| Temperature | 4,487±122[12] K |
| Metallicity [Fe/H] | +0.05[9] dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
The object has a stellar classification of K3 III,[4] indicating that it is an evolved red giant star. It has a comparable mass to the Sun[9] but it has expanded to 24.9 times the radius of the Sun.[10] It radiates 228 times the luminosity of the Sun[1] from its enlarged photosphere at an effective temperature of 4,487 K.[12] HD 88231 is slightly metal enriched with an iron abundance 112% that of the Sun ([Fe/H] = +0.05).[9]
HD 88231 was suspected to be variable in the K-band based on Two-Micron Sky Survey observations in 1969.[15] A 1994 paper found that it ranges from 5.79 to 5.88 in the visual band.[3] As of 2004 however, the variability has not been confirmed.[16]