HD 194612

HD 194612
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Octans
Right ascension 20h 38m 18.6064s[1]
Declination −81° 17′ 20.6261″[1]
Apparent magnitude (V) 5.89±0.01[2]
Characteristics
Evolutionary stage RGB[3]
Spectral type K5 III[4]
U−B color index +2.02[5]
B−V color index +1.71[5]
Astrometry
Radial velocity (Rv)0.3±0.4[6] km/s
Proper motion (μ) RA: +1.597 mas/yr[1]
Dec.: −37.819 mas/yr[1]
Parallax (π)4.3006 ± 0.0707 mas[1]
Distance760 ± 10 ly
(233 ± 4 pc)
Absolute magnitude (MV)−0.56[7]
Details
Mass2.1[8] M☉
Radius59.9[9] R☉
Luminosity598±13[10] L☉
Surface gravity (log g)0.99±0.02[3] cgs
Temperature3941±122[9] K
Rotational velocity (v sin i)2.3±1.2[11] km/s
Other designations
49 G. Octantis[12], CPD−81°906, GC 28578, HD 194612, HIP 101843, HR 7812, SAO 258864[13]
Database references
SIMBADdata

HD 194612 (HR 7812) is a solitary[14] orange hued star located in the southern circumpolar constellation Octans. It has an apparent magnitude of 5.9,[2] making it visible to the naked eye under ideal conditions. Parallax measurements place it at a distance of 760 light years[1] and it has a low heliocentric radial velocity of 0.3 km/s.[6]

This is a red giant with a stellar classification of K5 III,[4] and Gaia DR3 stellar evolution models place it on the red giant branch.[3] It has double the mass of the Sun[8] and an enlarged radius of 59.9 R☉[9] due to its evolved status. It shines with a luminosity of 598 L☉[10] from its photosphere at an effective temperature of 3,941 K.[9] Like many giants, HD 194612 has a comparatively modest projected rotational velocity, which is around 2.3 km/s.[11]

  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. ^ a b c Cite error: The named reference GaiaDR3 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 Cite error: The named reference Kervella2021 was invoked but never defined (see the help page).
  9. ^ a b c d Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference DeMederios2014 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference GouldNEW 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 Eggleton2008 was invoked but never defined (see the help page).