HD 208741

HD 208741
Observation data
Epoch J2000      Equinox J2000
Constellation Octans
A
Right ascension 22h 03m 03.8227s[1]
Declination −76° 07′ 06.453″[1]
Apparent magnitude (V) 5.93±0.01[2]
B
Right ascension 22h 03m 12.9150s[3]
Declination −76° 06′ 54.860″[3]
Apparent magnitude (V) 10.57[4]
Characteristics
A
Evolutionary stage main sequence[5]
Spectral type F3 III[6][7]
U−B color index +0.11[8]
B−V color index +0.39[8]
B
Spectral type K5[9]
B−V color index +0.7
Astrometry
Radial velocity (Rv)8±1.1[10] km/s
Absolute magnitude (MV)+1.96[11]
A
Proper motion (μ) RA: +24.821[1] mas/yr
Dec.: −72.437[1] mas/yr
Parallax (π)15.4736 ± 0.0383 mas[1]
Distance210.8 ± 0.5 ly
(64.6 ± 0.2 pc)
B
Proper motion (μ) RA: +29.912[3] mas/yr
Dec.: −71.414[3] mas/yr
Parallax (π)15.5058 ± 0.0249 mas[3]
Distance210.3 ± 0.3 ly
(64.5 ± 0.1 pc)
Details
A
Mass1.52±0.25[12] M☉
Radius2.6±0.1[12] R☉
Luminosity12.9[13] L☉
Surface gravity (log g)3.89[14] cgs
Temperature6,937±80[14] K
Metallicity [Fe/H]+0.33[14] dex
Rotational velocity (v sin i)36[15] km/s
Age1.1±0.1[16] Gyr
Other designations
66 G. Octantis, CD−76°1113, CPD−76°1542, FK5 3760, GC 30788, HD 208741, HIP 108849, HR 8380, SAO 257993, WDS J22031-7607A
Database references
SIMBADA
B

HD 208741, also known as HR 8380, is a yellowish-white hued star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.91,[2] making it faintly visible to the naked eye. Parallax measurements place it at a distance of 211 light years,[1] and it is currently receding with a heliocentric radial velocity of 8 km/s.[10]

HD 208741 has a 10th magnitude K-type main-sequence companion[9] separated by 34.8″.[4] Together, they make up a wide binary system designated collectively as CPD−76°1542.[4] Sir John Herschel, the discoverer of the pair, noted the primary to be a probable spectroscopic binary.[17]

This object has a stellar classification of F3 III,[6][7] indicating that it is a slightly evolved F-type star. Gaia Data Release 3 models it to be a dwarf that is 81.3% through its main sequence lifetime.[5] At present it has 1.52 times the mass of the Sun and a slightly enlarged radius of 2.6 R☉[12] due to its evolved state. It radiates at 12.9 times the luminosity of the Sun[13] from its photosphere at an effective temperature of 6,937 K.[14] HD 208741 has a metallicity twice the Sun's,[14] making it metal enriched. It is estimated to be 1.1 billion years old,[16] and is spinning with a projected rotational velocity of 36 km/s.[15]

  1. ^ a b c d e f Cite error: The named reference EDR3A 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 c d e Cite error: The named reference EDR3B was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Mason2001 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference GaiaDR3A was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference de Vaucouleurs1957 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Malaroda1975 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Stoy1966 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  12. ^ a b c Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  13. ^ a b Cite error: The named reference McDonald2012 was invoked but never defined (see the help page).
  14. ^ a b c d e Cite error: The named reference Casagrande2011 was invoked but never defined (see the help page).
  15. ^ a b Cite error: The named reference Esramper2003 was invoked but never defined (see the help page).
  16. ^ a b Cite error: The named reference Nordstrom2004 was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference Herschel1835 was invoked but never defined (see the help page).