HD 31529
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| 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 star was designated Pi Caeli by Johann Elert Bode in his 1801 Uranographia, but this is now no longer used.[13]
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]
