HD 88836

HD 88836
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Antlia
Right ascension 10h 13m 56.55764s[1]
Declination −40° 18′ 38.7862″[1]
Apparent magnitude (V) 6.32±0.01[2]
Characteristics
Evolutionary stage red giant branch[1]
Spectral type G8 III[3]
B−V color index +0.94[4]
Astrometry
Radial velocity (Rv)0±0.4[5] km/s
Proper motion (μ) RA: −30.210 mas/yr[1]
Dec.: −8.448 mas/yr[1]
Parallax (π)7.0190 ± 0.0167 mas[1]
Distance465 ± 1 ly
(142.5 ± 0.3 pc)
Absolute magnitude (MV)+0.61[6]
Details[7]
Mass2.32±0.13 M☉
Radius9.96±0.15 R☉
Luminosity58.3±1.0 L☉
Surface gravity (log g)2.78±0.06 cgs
Temperature5,055±32 K
Metallicity [Fe/H]−0.02±0.03 dex
Rotational velocity (v sin i)1.6±1.2[8] km/s
Age619[1] Myr
Other designations
56 G. Antliae[9], CD−39°6225, CPD−39°4270, HD 88836, HIP 50122, HR 4019, SAO 221883, WDS J10139-4019A[10]
Database references
SIMBADdata

HD 88836, also known as HR 4019, is a solitary, yellow-hued star located in the southern constellation Antlia. It has an apparent magnitude of 6.32,[2] placing it near the limit for naked eye visibility. Based on an annual parallax shift of 7.019 mas, the object is estimated to be 465 light years away from the Solar System.[1] Its distance from the Sun does not appear to be changing, having a radial velocity of 0 km/s.[5]

HD 88836 has a stellar classification of G8 III,[3] indicating that it is an evolved red giant. Gaia Data Release 3 stellar evolution models place it on the red giant branch.[1] At present it has 2.3 times the mass of the Sun but has expanded to 10 times its girth.[7] It shines with a luminosity of 58.3 L☉ from its enlarged photosphere at an effective temperature of 5,055 K.[7] HD 88836 metallicity – what astronomers dub as a star's abundance of elements heavier than helium – is around solar level.[7] Like most giants, the object spins slowly, having a projected rotational velocity of 1.6 km/s.[8]

There is a 13th magnitude companion located 10.9″ away along a position angle of 209°,[11] which was first noticed by R.A. Rossiter in 1912. It is unknown if its physically related to HD 88836 or not, although its Gaia Data Release 3 parallax is much smaller than HD 88836's.[12]

  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 Houk1982 was invoked but never defined (see the help page).
  4. ^ 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. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference Ottoni2022 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference De Medeiros2014 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Mason2001 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference dr3b was invoked but never defined (see the help page).