HD 99015

HD 99015
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]
Distance243.4 ± 0.4 ly
(74.6 ± 0.1 pc)
Absolute magnitude (MV)+2.08[6]
Details
Mass1.87±0.06[7] M☉
Radius1.83±0.09[8] R☉
Luminosity12.0+0.3
−0.2[1] L☉
Surface gravity (log g)4.2±0.1[9] cgs
Temperature7,859±124[9] K
Metallicity [Fe/H]+0.15[10] dex
Age854[11] Myr
Other designations
31 G. Chamaeleontis[12], CD−76°495, CPD−76°662, GC 15628, HD 99015, HIP 55497, HR 4397, SAO 256832[13]
Database references
SIMBADdata

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]

  1. ^ a b c d e f g h Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Oblak1981 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference AP1999 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Kervella2004 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Netopil2017 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Houk1975 was invoked but never defined (see the help page).