Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Caelum [1] |
Right ascension | 04h 54m 54.81319s [2] |
Declination | −39° 37′ 42.9886″ [2] |
Apparent magnitude (V) | 6.09±0.01 [3] |
Characteristics | |
Evolutionary stage | red giant branch [2] |
Spectral type | K3 III [4] |
B−V color index | +1.42 [5] |
Astrometry | |
Radial velocity (Rv) | 28.4±0.4 [6] km/s |
Proper motion (μ) | RA: −6.482 mas/yr [2] Dec.: +22.102 mas/yr [2] |
Parallax (π) | 3.4977±0.0268 mas [2] |
Distance | 932 ± 7 ly (286 ± 2 pc) |
Absolute magnitude (MV) | −1.73 [1] |
Details | |
Mass | 4.81+0.11 −0.04 [2] 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 | |
22 G. Caeli, CD−39°1691, CPD−39°536, FK5 2371, GC 6016, HD 31529, HIP 22847, HR 1584, SAO 195400 | |
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, [3] 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, [2] but is receding with a heliocentric radial velocity of 28.4 km/s . [6] 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 [2] 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]