HD 43899
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  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Columba[1] |
| Right ascension | 06h 17m 01.23139s[2] |
| Declination | −37° 44′ 14.8056″[2] |
| Apparent magnitude (V) | 5.53±0.01[3] |
| Characteristics | |
| Evolutionary stage | red clump[4] |
| Spectral type | K2 III[5] |
| U−B color index | +1.11[6] |
| B−V color index | +1.14[6] |
| Astrometry | |
| Radial velocity (Rv) | 66.5±4.3[7] km/s |
| Proper motion (μ) | RA: +1.657 mas/yr[2] Dec.: +83.920 mas/yr[2] |
| Parallax (π) | 11.4725±0.0449 mas[2] |
| Distance | 284 ± 1 ly (87.2 ± 0.3 pc) |
| Absolute magnitude (MV) | +0.73[1] |
| Details | |
| Mass | 1.15±0.10[4] M☉ |
| Radius | 11.67±0.19[4] R☉ |
| Luminosity | 61+2.6 −5.0[2] L☉ |
| Surface gravity (log g) | 2.04±0.24[4] cgs |
| Temperature | 4,686±122[8] K |
| Metallicity [Fe/H] | −0.12±0.08[4] dex |
| Rotational velocity (v sin i) | 2.9±1[9] km/s |
| Age | 6.32±1.68[4] Gyr |
| Other designations | |
| 86 G. Columbae[10], CD−37°2707, CPD−37°890, GC 8075, HD 43899, HIP 29842, HR 2263, SAO 196653[11] | |
| Database references | |
| SIMBAD | data |
HD 43899, also designated as HR 2263, is a solitary,[12] orange hued star located in the southern constellation Columba, the dove. It has an apparent magnitude of 5.53,[3] allowing it to be faintly visible to the naked eye. Based on parallax measurements from the Gaia spacecraft, the object is estimated to be 284 light years distant.[2] It appears to be rapidly receding with a heliocentric radial velocity of 66.5 km/s.[7] Eggen (1993) lists HD 43899 as an old disk star[13] and its kinematics match with that of the ζ Herculis moving group.[14]
HD 43899 is an evolved giant star that is currently on the horizontal branch, a red clump star, fusing a hydrogen shell around an inert helium core.[4] It has a stellar classification of K2 III.[5] At present the object has 115% the mass of the Sun[4] and an effective temperature of 4,686 K.[8] At the age of 6.32 billion years,[4] it has already left the main sequence and now radiates 61 times the luminosity of the Sun[2] from an enlarged photosphere 11.7 times that of the sun.[4] HD 43899 has an iron abundance 24% below solar levels, making it slightly metal deficient.[4] It spins modestly with a projected rotational velocity of 2.9 km/s.[9]
