HD 43899
HD 43899, also designated as HR 2263, is a solitary, orange hued star located in the southern constellation Columba, the dove. It has an apparent magnitude of 5.53, 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. It appears to be rapidly receding with a heliocentric radial velocity of 66.5 km/s. Eggen (1993) lists HD 43899 as an old disk star and its kinematics match with that of the ζ Herculis moving group.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Columba |
| Right ascension | 06h 17m 01.23139s |
| Declination | −37° 44′ 14.8056″ |
| Apparent magnitude (V) | 5.53±0.01 |
| Characteristics | |
| Evolutionary stage | red clump |
| Spectral type | K2 III |
| U−B color index | +1.11 |
| B−V color index | +1.14 |
| Astrometry | |
| Radial velocity (Rv) | 66.5±4.3 km/s |
| Proper motion (μ) | RA: +1.657 mas/yr Dec.: +83.920 mas/yr |
| Parallax (π) | 11.4725 ± 0.0449 mas |
| Distance | 284 ± 1 ly (87.2 ± 0.3 pc) |
| Absolute magnitude (MV) | +0.73 |
| Details | |
| Mass | 1.15±0.10 M☉ |
| Radius | 12.38 R☉ |
| Luminosity | 61+2.6 −5.0 L☉ |
| Surface gravity (log g) | 2.04±0.24 cgs |
| Temperature | 4,686±122 K |
| Metallicity [Fe/H] | −0.12±0.08 dex |
| Rotational velocity (v sin i) | 2.9±1 km/s |
| Age | 6.32±1.68 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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. It has a stellar classification of K2 III. At present the object has 115% the mass of the Sun and an effective temperature of 4,686 K. At the age of 6.32 billion years, it has already left the main sequence and now radiates 61 times the luminosity of the Sun from an enlarged photosphere 12.4 times that of the sun. HD 43899 has an iron abundance 24% below solar levels, making it slightly metal deficient. It spins modestly with a projected rotational velocity of 2.9 km/s.