32 Leonis Minoris
Star in the constellation Leo Minor
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32 Leonis Minoris (32 LMi), also known as HD 90840, is a solitary star[14] located in the northern constellation Leo Minor. It is faintly visible to the naked eye as a white-hued point of light with an apparent magnitude of 5.78.[2] The object is located relatively far at a distance of 729 light-years based on Gaia DR3 parallax measurements[1] and it is currently receding with a heliocentric radial velocity of 2 km/s,[6] which is somewhat constrained. At its current distance, 32 LMi's brightness is diminished by 0.14 magnitudes due to interstellar extinction[15] and it has an absolute magnitude of −1.02.[7]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Leo Minor |
| Right ascension | 10h 30m 06.44761s[1] |
| Declination | +38° 55′ 30.4758″[1] |
| Apparent magnitude (V) | 5.78±0.01[2] |
| Characteristics | |
| Evolutionary stage | subgiant[3] |
| Spectral type | A4 V[4] or A4 III[5] |
| U−B color index | +0.14[5] |
| B−V color index | +0.07[5] |
| Astrometry | |
| Radial velocity (Rv) | 2±4.3[6] km/s |
| Proper motion (μ) | RA: −16.446 mas/yr[1] Dec.: −4.506 mas/yr[1] |
| Parallax (π) | 4.4749±0.0527 mas[1] |
| Distance | 729 ± 9 ly (223 ± 3 pc) |
| Absolute magnitude (MV) | −1.02[7] |
| Details | |
| Mass | 2.01±0.39[8] M☉ |
| Radius | 6.58±0.33[9] R☉ |
| Luminosity | 241+41 −35[3] L☉ |
| Surface gravity (log g) | 3.07±0.37[8] cgs |
| Temperature | 8,511+79 −78[3] K |
| Metallicity [Fe/H] | −0.80[10] dex |
| Rotational velocity (v sin i) | 70±8[11] km/s |
| Age | 465[12] Myr |
| Other designations | |
| 32 LMi, AG+39°1131, BD+39°2357, GC 14417, HD 90840, HIP 51420, HR 4113, SAO 62076[13] | |
| Database references | |
| SIMBAD | data |
The object has been given several stellar classifications over the years, ranging from main sequence (V) to giant star (III) and A1 to A4. Two of the classifications are A4 V[4] and A4 III.[5] It has 2.01 times the mass of the Sun[8] but at the age of 465 million years,[12] 32 LMi is now on the subgiant branch[8][failed verification] and it has expanded to 6.58 times the radius of the Sun.[9] It radiates 241 times the luminosity of the Sun[3] from its photosphere at an effective temperature of 8,511 K.[3] 32 LMi is metal deficient with an iron abundance only 15.9% that of Sun ([Fe/H] = −0.80)[10] and it spins modestly with a projected rotational velocity of 70 km/s.[11]