Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Chamaeleon |
Right ascension | 11h 21m 56.89166s[1] |
Declination | −77° 36′ 30.1275″[1] |
Apparent magnitude (V) | 6.42±0.01[2] |
Characteristics | |
Evolutionary stage | main sequence[1] |
Spectral type | A5 V[3] |
U−B color index | +0.11[4] |
B−V color index | +0.20[4] |
Astrometry | |
Radial velocity (Rv) | −5.9±2.5[5] km/s |
Proper motion (μ) | RA: −79.623 mas/yr[1] Dec.: −8.231 mas/yr[1] |
Parallax (π) | 13.3992 ± 0.0202 mas[1] |
Distance | 243.4 ± 0.4 ly (74.6 ± 0.1 pc) |
Absolute magnitude (MV) | +2.08[6] |
Details | |
Mass | 1.87±0.06[7] M☉ |
Radius | 1.83±0.09[8] R☉ |
Luminosity | 12.0+0.3 −0.2[1] L☉ |
Surface gravity (log g) | 4.2±0.1[9] cgs |
Temperature | 7,859±124[9] K |
Metallicity [Fe/H] | +0.15[10] dex |
Age | 854[11] Myr |
Other designations | |
Database references | |
SIMBAD | data |
HD 99015, also known as HR 4397 or rarely 31 G. Chamaeleontis, is a solitary white-hued star located in the southern circumpolar constellation Chamaeleon. It has an apparent magnitude of 6.42,[2] placing it near the limit for naked eye visibility even in ideal conditions. The object is located relatively close at a distance of 243 light years[1] and is drifting closer with a somewhat constrained heliocentric radial velocity of −5.9 km/s.[5] At its current distance, HD 99015's brightness is diminished by 0.31 magnitudes due to interstellar dust.[14] It has an absolute magnitude of +2.08.[6]
This is an ordinary A-type main-sequence star with a stellar classification of A5 V.[3] However, Nancy Houk and A. P. Cowley gave a class of A5 III/IV,[15] indicating that it is instead an evolved A-type star with the luminosity class of a subgiant and giant star. It has 1.87 times the mass of the Sun[7] and 1.83 times the solar radius.[8] It radiates 12 times the luminosity of the Sun[1] from its photosphere at an effective temperature of 7,859 K.[9] HD 99015 is somewhat metal enriched ([Fe/H] = +0.15[10]) and is estimated to be 854 million years old.[11]