HD 10390
B-type main-sequence star; Triangulum
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HD 10390 (HR 490; 6 H. Trinaguli) is a solitary star[17] located in the northern constellation Triangulum. It is faintly visible to the naked eye as a bluish-white hued point of light with an apparent magnitude of 5.64.[2] The object is located relatively close at a distance of 292 light-years based on Gaia DR3 parallax measurements[1] and it is drifting closer with a heliocentric radial velocity of −1.9 km/s.[6] At its current distance, HD 10390's brightness is diminished by an interstellar extinction of only five-hundredths of a magnitude[18] and it has an absolute magnitude of +1.00.[7]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Triangulum |
| Right ascension | 01h 42m 03.48964s[1] |
| Declination | +35° 14′ 44.5389″[1] |
| Apparent magnitude (V) | 5.64[2] |
| Characteristics | |
| Evolutionary stage | main sequence star[3] |
| Spectral type | B9 IV-V[4] or B9 V[5] |
| U−B color index | −0.20[2] |
| B−V color index | −0.07[2] |
| Astrometry | |
| Radial velocity (Rv) | −1.9±2.0[6] km/s |
| Proper motion (μ) | RA: +48.763 mas/yr[1] Dec.: −25.418 mas/yr[1] |
| Parallax (π) | 11.1882±0.164 mas[1] |
| Distance | 292 ± 4 ly (89 ± 1 pc) |
| Absolute magnitude (MV) | +1.00[7] |
| Details | |
| Mass | 2.62[8] M☉ |
| Radius | 2.14±0.11[9] R☉ |
| Luminosity | 51.5+2.4 −2.3[3] L☉ |
| Surface gravity (log g) | 4.23+0.08 −0.04[10] cgs |
| Temperature | 11,076±139[11] K |
| Metallicity [Fe/H] | −0.20[12] dex |
| Rotational velocity (v sin i) | 45[13] km/s |
| Age | 50+81 −31[14] Myr |
| Other designations | |
| 6 H. Trianguli,[15] AG+34°163, BD+34°297, FK5 1047, GC 2064, HD 10390, HIP 7943, HR 490, SAO 54912, TIC 61524043[16] | |
| Database references | |
| SIMBAD | data |
HD 10390 has a stellar classification of B9 IV-V,[4] indicating that it is a slightly evolved B-type star with a luminosity class intermediate between a subgiant and a main sequence star. Osawa (1959) gave a class of B9 V,[5] instead indicating that it is an ordinary B-type main-sequence star that is generating energy via hydrogen fusion at its core. It has 2.62 times the mass of the Sun[8] and 2.14 times the radius of the Sun.[9] It radiates 51.5 times the luminosity of the Sun[3] from its photosphere at an effective temperature of 11,076 K.[11] HD 10390 is metal defecient with an iron abundance of [Fe/H] = −0.2 or 63.1% of the Sun's[12] and it spins modestly with a projected rotational velocity of 45 km/s,[13] well below its breakup velocity of 355 km/s.[19] Despite the first classification, HD 10390 has only completed 16.8% of its main sequence lifetime[3] at the age of approximately 50 million years. [14]