HD 82205

HD 82205
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Antlia
Right ascension 09h 29m 54.5048s[1]
Declination −26° 35′ 22.6154″[1]
Apparent magnitude (V) 5.48±0.01[2]
Characteristics
Spectral type K3 III[3]
B−V color index +1.36[4]
Astrometry
Radial velocity (Rv)12±2[5] km/s
Proper motion (μ) RA: −21.883 mas/yr[1]
Dec.: +0.761 mas/yr[1]
Parallax (π)4.0447 ± 0.0731 mas[1]
Distance810 ± 10 ly
(247 ± 4 pc)
Absolute magnitude (MV)−1.42[6]
Details
Mass4.46[7] M☉
Radius38.86[8] R☉
Luminosity552[9] L☉
Surface gravity (log g)1.61±0.01[10] cgs
Temperature4,413±122[8] K
Metallicity [Fe/H]+0.09[11] dex
Rotational velocity (v sin i)<1[12] km/s
Other designations
3 G. Antliae[13], CD−26°7117, GC 13110, HD 82205, HR 3770, SAO 177546, WDS J09299-2635A[14]
Database references
SIMBADdata

HD 82205 (HR 3770) is a solitary star[15] in the southern constellation Antlia. It is faintly visible to the naked eye with an apparent magnitude of 5.48[2] and is estimated to be 810 light years[1] distant based on parallax measurements. However, it is receding with a heliocentric radial velocity of 12 km/s.[5]

HD 82205 has a general stellar classification of K3 III, indicating that it is a red giant. However, Houk and Cowley (1982) found a slightly warmer class of K2 III CNII,[16] which also suggests a strong overabundance of cyano radicals in the stellar atmosphere. At present it has 4.46 times the mass of the Sun[7] but has expanded to 38.9 times its girth.[8] It shines with a luminosity of 552 L☉[9] from its enlarged photosphere at an effective temperature of 4,413 K,[8] giving an orange hue. HD 82205 has a metallicity 123% that of the Sun and is believed to be a member of the thin disk population.[11] Currently, it spins with a projected rotational velocity lower than 1 km/s.[12]

There is a 14th magnitude optical companion separated 12.4 arcseconds away along a position angle of 131°.[17] The object was first noticed by T.J.J See in 1897.[18]

  1. ^ a b c d e Cite error: The named reference EDR3 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. ^ Cite error: The named reference Abt1985 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 Wilson1953 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 Cite error: The named reference Kervella2021 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference McDonald2012 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Eggen1989 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference DeMederios2014 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Houk1982 was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference Mason2001 was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference See1897 was invoked but never defined (see the help page).