HD 88981
Star in the constellation Carina
From Wikipedia, the free encyclopedia
M Carinae (HD 88981) is a solitary star in the constellation Carina. It has an apparent magnitude of +5.154,[3] making it faintly visible to the naked eye under ideal and is located approximately 310[2] light-years from Earth. With a heliocentric radial velocity of −15.2 km/s[7] M Carinae is drifting closer to the Solar System.
 | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Carina[1] |
| Right ascension | 10h 13m 30.6318s[2] |
| Declination | −66° 22′ 22.1166″[2] |
| Apparent magnitude (V) | 5.154±0.009[3] |
| Characteristics | |
| Evolutionary stage | main sequence[4] |
| Spectral type | kA8 mF4 III[5] |
| U−B color index | +0.18[6] |
| B−V color index | +0.22[6] |
| Astrometry | |
| Radial velocity (Rv) | −15.2 ± 2[7] km/s |
| Proper motion (μ) | RA: −34.330[2] mas/yr Dec.: +11.333[2] mas/yr |
| Parallax (π) | 10.5045±0.1031 mas[2] |
| Distance | 310 ± 3 ly (95.2 ± 0.9 pc) |
| Absolute magnitude (MV) | +0.28[1] |
| Details | |
| Mass | 2.14±0.40[8] M☉ |
| Radius | 4.45+0.35 −0.16[2] R☉ |
| Luminosity | 62.9±0.7[2] L☉ |
| Surface gravity (log g) | 3.52±0.39[8] cgs |
| Temperature | 7,706+142 −289[2] K |
| Rotational velocity (v sin i) | 60[9] km/s |
| Other designations | |
| M Carinae, CPD−65°1273, GC 14066, HD 88981, HIP 50083, HR 4025, SAO 250880, GSC 08955-01326[10] | |
| Database references | |
| SIMBAD | data |
M Car has a stellar classification of kA8 mF4 III[5] which indicates that it has the calcium K-line and surface temperature of an A8 star and the metallic lines of an evolved F-type giant that has just exhausted hydrogen fusion at its core. At present M Car has 2.14[8] times the mass of the Sun but has mildly expanded to 4.45 times its girth. It shines at a luminosity almost 63 times greater than the Sun from its bloated photosphere at an effective temperature of 7,706 K,[2] which gives it the white glow of an A-type star. M Car spins moderately at a projected rotational velocity of 60 km/s,[9] slightly faster than most Am stars.