Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Caelum |
Right ascension | 04h 54m 54.81319s[1] |
Declination | −39° 37′ 42.9886″[1] |
Apparent magnitude (V) | 6.09±0.01[2] |
Characteristics | |
Evolutionary stage | red giant branch[1] |
Spectral type | K3 III[3] |
B−V color index | +1.42[4] |
Astrometry | |
Radial velocity (Rv) | 28.4±0.4[5] km/s |
Proper motion (μ) | RA: −6.482 mas/yr[1] Dec.: +22.102 mas/yr[1] |
Parallax (π) | 3.4977 ± 0.0268 mas[1] |
Distance | 932 ± 7 ly (286 ± 2 pc) |
Absolute magnitude (MV) | −1.73[6] |
Details | |
Mass | 4.81+0.11 −0.04[1] M☉ |
Radius | 54.06[7] R☉ |
Luminosity | 915[8] L☉ |
Surface gravity (log g) | 1.15[9] cgs |
Temperature | 4,159±122[10] K |
Metallicity [Fe/H] | −0.12[11] dex |
Rotational velocity (v sin i) | 2.1±1.3[12] km/s |
Other designations | |
Database references | |
SIMBAD | data |
HD 31529, also known as HR 1584, is a solitary, orange hued star located in the southern constellation Caelum, the chisel. It has an apparent magnitude of 6.09,[2] making it faintly visible to the naked eye if viewed under ideal conditions. This object is located relatively far at a distance of 932 light years based on parallax measurements from Gaia DR3,[1] but is receding with a heliocentric radial velocity of 28.4 km/s.[5] Eggen (1989) lists it as a member of the old disk population.[11]
This is an evolved red giant star with a stellar classification of K3 III. It is currently on the red giant branch, generating energy by fusing hydrogen in a shell around its core. It has 4.8 times the mass of the Sun[1] and an enlarged radius of 54.06 R☉[7] due to its evolved state. It radiates 915 times the luminosity of the Sun[8] from its photosphere at an effective temperature of 4,159 K.[10] HD 31529 is slightly metal deficient (76% solar iron abundance)[11] and spins modestly with a projected rotational velocity of 2.1 km/s.[12]