HD 88809
Star in the constellation of Antlia
From Wikipedia, the free encyclopedia
HD 88809 is a star located in the southern constellation Antlia. With an apparent magnitude of 5.89[3] it is barely visible to the naked eye under ideal conditions. The star is located at a distance of around 451 light years[2] but is drifting away at a heliocentric radial velocity of almost 20 km/s.[2]
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Antlia[1] |
| Right ascension | 10h 13m 45.9269s[2] |
| Declination | −40° 20′ 45.683″[2] |
| Apparent magnitude (V) | 5.893±0.009[3] |
| Characteristics | |
| Spectral type | K1 III[4] |
| U−B color index | +1.25[5] |
| B−V color index | +1.21[5] |
| Astrometry | |
| Radial velocity (Rv) | 19.96±0.76[2] km/s |
| Proper motion (μ) | RA: −79.460[2] mas/yr Dec.: +2.511[2] mas/yr |
| Parallax (π) | 7.2269±0.0909 mas[2] |
| Distance | 451 ± 6 ly (138 ± 2 pc) |
| Absolute magnitude (MV) | +0.09[1] |
| Position (relative to HD 88809A)[6] | |
| Component | HD 88809B |
| Epoch of observation | J2000.0 |
| Angular distance | 4.9″ |
| Position angle | 105° |
| Projected separation | 676.2 AU |
| Details | |
| Mass | 1.29+1.20 −0.4[7] M☉ |
| Radius | 17.7[8] R☉ |
| Luminosity | 117±8[7] L☉ |
| Temperature | 4,410±110[7] K |
| Metallicity [Fe/H] | −0.2[7] dex |
| Rotational velocity (v sin i) | <1.3[9] km/s |
| Age | 4.9[10] Gyr |
| Other designations | |
| 55 G. Antliae, CD−39°6222, HD 88809, HIP 50103, HR 4015, SAO 22187 | |
| Database references | |
| SIMBAD | data |
HD 88809 has a classification of K1 III[4] which indicates that it is an evolved early K-type giant star that has exhausted hydrogen at its core and left the main sequence. It has an angular diameter of 1.15 mas,[11] which yields a diameter of 17.07[12] times that of the Sun at its estimated distance. At present HD 88809 has 129%[7] the mass of the Sun and shines with a luminosity approximately 117[7] times that of the Sun and has a surface temperature of 4,410 K,[7] which gives it an orange glow of a K-type star. HD 88809 has a faint 13th magnitude companion located approximately 4.9″ away.[6]
