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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[2] it is barely visible to the naked eye under ideal conditions. The star is located at a distance of around 451 light years[1] but is drifting away at a heliocentric radial velocity of almost 20 km/s.[1]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Antlia |
Right ascension | 10h 13m 45.9269s[1] |
Declination | −40° 20′ 45.6832″[1] |
Apparent magnitude (V) | 5.893±0.009[2] |
Characteristics | |
Spectral type | K1 III[3] |
U−B color index | +1.25[4] |
B−V color index | +1.21[4] |
Astrometry | |
Radial velocity (Rv) | 19.96±0.76[1] km/s |
Proper motion (μ) | RA: −79.460[1] mas/yr Dec.: +2.511[1] mas/yr |
Parallax (π) | 7.2269 ± 0.0909 mas[1] |
Distance | 451 ± 6 ly (138 ± 2 pc) |
Absolute magnitude (MV) | +0.19 |
Details[5] | |
Mass | 1.29+1.20 −0.4 M☉ |
Radius | 17.07[6] R☉ |
Luminosity | 117±8 L☉ |
Temperature | 4,410±110 K |
Metallicity [Fe/H] | −0.2 dex |
Rotational velocity (v sin i) | <1.3[7] km/s |
Age | 4.9[8] Gyr |
Position (relative to HD 88809A)[9] | |
Component | HD 88809B |
Epoch of observation | J2000.0 |
Angular distance | 4.9″ |
Position angle | 105° |
Projected separation | 676.2 AU |
Other designations | |
Database references | |
SIMBAD | data |
HD 88809 has a classification of K1 III[3] 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,[10] which yields a diameter of 17.07[6] times that of the Sun at its estimated distance. At present HD 88809 has 129%[5] the mass of the Sun and shines with a luminosity approximately 117[5] times that of the Sun and has a surface temperature of 4,410 K,[5] which gives it an orange glow of a K-type star. HD 88809 has a faint 13th magnitude companion located approximately 4.9″ away.[9]
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