HD 31134
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 04h 56m 07.07238s |
| Declination | +52° 52′ 11.0544″ |
| Apparent magnitude (V) | 5.74±0.01 |
| Characteristics | |
| Evolutionary stage | main sequence star |
| Spectral type | A2 Vs or A1 Vp |
| U−B color index | +0.11 |
| B−V color index | +0.09 |
| Astrometry | |
| Radial velocity (Rv) | −15.1±2.5 km/s |
| Proper motion (μ) | RA: −3.418 mas/yr Dec.: +14.954 mas/yr |
| Parallax (π) | 6.8897±0.1144 mas |
| Distance | 473 ± 8 ly (145 ± 2 pc) |
| Absolute magnitude (MV) | +0.19 |
| Details | |
| Mass | 2.74±0.05 M☉ |
| Radius | 4.38±0.22 R☉ |
| Luminosity | 103+13 −11 L☉ |
| Surface gravity (log g) | 3.85 cgs |
| Temperature | 8,690 K |
| Metallicity [Fe/H] | −0.11 dex |
| Rotational velocity (v sin i) | 60±1 km/s |
| Age | 432 Myr |
| Other designations | |
| AG+52°472, BD+52°898, GC 5988, HD 31134, HIP 22936, HR 1561, SAO 24919 | |
| Database references | |
| SIMBAD | data |
HD 31134, also designated as HR 1561, is a solitary star located in the northern circumpolar constellation Camelopardalis, the giraffe. It is faintly visible to the naked eye as a white-hued star with an apparent magnitude of 5.74. Gaia DR3 parallax measurements place it 473 light years away. It appears to be approaching the Solar System with a heliocentric radial velocity of −15.1 km/s. At its current distance, HD 31134's brightness is diminished by 0.35 magnitudes due to interstellar dust. It has an absolute magnitude of +0.19.
The object has a stellar classification of A2 Vs, indicating that it is an A-type main-sequence star with sharp or narrow absorption lines due to slow rotation. Two sources remove the s prefix and instead list it as an ordinary dwarf star while one lists it as a more evolved giant star. Abt and Morell (1995) list it as a slightly hotter peculiar Ap star, but it is now considered unlikely to be chemically peculiar. It has 2.74 times the mass of the Sun and an enlarged radius of 4.38 R☉. It radiates 103 times the luminosity of the Sun from its photosphere at an effective temperature of 8,690 K. HD 31134 is a rather evolved star, having completed 97.6% of its main sequence lifetime at the age of 432 million years. Consistent with its spectrum, it spins modestly with a projected rotational velocity of 60 km/s.