HD 89998
Star in the constellation Vela
From Wikipedia, the free encyclopedia
HD 89998 (r Velorum) is a single[9] star in the southern constellation of Vela. It is a faint star but visible to the naked eye with an apparent visual magnitude of 4.82.[1] The distance to HD 89998, as determined from its annual parallax shift of 15.9 mas,[2] is 205 light years. The star is moving further from the Earth with a heliocentric radial velocity of +21 km/s,[4] having come within 140 ly some 1.552 million years ago.[1]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Vela[1] |
| Right ascension | 10h 22m 19.58477s[2] |
| Declination | −41° 38′ 59.8592″[2] |
| Apparent magnitude (V) | 4.82[1] |
| Characteristics | |
| Spectral type | K1 III[3] |
| B−V color index | 1.095±0.055[1] |
| Astrometry | |
| Radial velocity (Rv) | +20.9±0.8[4] km/s |
| Proper motion (μ) | RA: −27.664[2] mas/yr Dec.: +60.090[2] mas/yr |
| Parallax (π) | 15.9154±0.1375 mas[2] |
| Distance | 205 ± 2 ly (62.8 ± 0.5 pc) |
| Absolute magnitude (MV) | 0.84[1] |
| Details | |
| Mass | 1.9[5] M☉ |
| Radius | 11.0[6] R☉ |
| Luminosity | 56[6] L☉ |
| Surface gravity (log g) | 2.77[5] cgs |
| Temperature | 4,761[6] K |
| Metallicity [Fe/H] | +0.12[5] dex |
| Rotational velocity (v sin i) | <1.0[7] km/s |
| Other designations | |
| r Vel, NSV 4837, CD−41°5809, FK5 1268, HD 89998, HIP 50799, HR 4080, SAO 221998[8] | |
| Database references | |
| SIMBAD | data |
This is an evolved giant star with a stellar classification of K1 III.[3] The measured angular diameter of this star, after correcting for limb darkening, is 1.72±0.02 mas.[10] At the estimated distance of this star, this yields a physical size of 11.6 times the radius of the Sun.[11] It is radiating 56 times the Sun's luminosity from its enlarged photosphere at en effective temperature of 4,761 K.[6]
