HD 104555

HD 104555
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Octans
Right ascension 12h 02m 20.23931s[1]
Declination −85° 37′ 54.3264″[1]
Apparent magnitude (V) 6.02±0.01[2]
Characteristics
Evolutionary stage horizontal branch[3]
Spectral type K3 III[4]
U−B color index +1.54[5]
B−V color index +1.29[5]
Astrometry
Radial velocity (Rv)17.1±0.4[6] km/s
Proper motion (μ) RA: −57.259 mas/yr[1]
Dec.: +1.452 mas/yr[1]
Parallax (π)9.7144 ± 0.0241 mas[1]
Distance335.7 ± 0.8 ly
(102.9 ± 0.3 pc)
Absolute magnitude (MV)+0.78[7]
Details
Mass2.18+0.02
−0.01[8] M☉
Radius9.82+1.95
−0.92[8] R☉
Luminosity59.8[9] L☉
Temperature4,497±122[10] K
Metallicity [Fe/H]−0.06+0.11
−0.08[8] dex
Rotational velocity (v sin i)<1[11] km/s
Age955+68
−42[8] Myr
Other designations
12 G. Octantis[12], CPD−84°371, FK5 3983, GC 16449, HD 104555, HIP 58697, HR 4595, SAO 258632, WDS J12023-8538A[13]
Database references
SIMBADdata

HD 104555, also known as HR 4595, is a star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 6.02,[2] allowing it to be faintly visible to the naked eye. Based on parallax measurements from Gaia Data Release 3, it is estimated to be 336 light years distant.[1] It appears to be receding from the Solar System, having a heliocentric radial velocity of 17.1 km/s.[6]

This is an evolved, orange hued giant star with a stellar classification of K3 III.[4] It is currently on the horizontal branch,[3] generating energy via helium fusion at its core. It has twice the mass of the Sun but at 955 million years old, it has expanded to 9.82 times its girth.[8] It radiates 60 times the luminosity of the Sun[9] from its photosphere at an effective temperature of 4,497 K.[10] HD 10455 has an iron abundance 12% below solar levels, making it slightly metal deficient.[8] Like most giants, it spins slowly, having a projected rotational velocity lower than 1 km/s.[11]

HIP 58713 is an 8th magnitude co-moving star located 24.8″ away along a position angle of 146°.[14] It is a main sequence star with a spectral class of F8, and is estimated to be around the same distance as HD 104555.[15]

  1. ^ a b c d e 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 Laney2011 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b c d e f Cite error: The named reference Bochanski2018 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference McDonald2017 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference DeMed2014 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 Mason2001 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference GaiaDR3B was invoked but never defined (see the help page).