HD 194012

HD 194012
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Delphinus
Right ascension 20h 22m 52.3692s[1]
Declination +14° 33′ 03.9513″[1]
Apparent magnitude (V) 6.15±0.01[2]
Characteristics
Spectral type F7 V[3]
U−B color index −0.07[4]
B−V color index +0.51[4]
Astrometry
Radial velocity (Rv)4.5±0.2[5] km/s
Proper motion (μ) RA: +78.997 mas/yr[1]
Dec.: −7.143 mas/yr[1]
Parallax (π)38.4009 ± 0.0233 mas[1]
Distance84.93 ± 0.05 ly
(26.04 ± 0.02 pc)
Absolute magnitude (MV)+4.06[6]
Details
Mass1.21+0.19
−0.16[7] M☉
Radius1.18±0.04[7] R☉
Luminosity1.9[8] L☉
Surface gravity (log g)4.36[8] cgs
Temperature6,301±80[9] K
Metallicity [Fe/H]−0.06[8] dex
Rotational velocity (v sin i)5[10] km/s
Age1.06[11] Gyr
Other designations
AG+14°2196, BD+14°4275, GC 28343, GJ 789, HD 194012, HIP 100511, HR 7793, SAO 106042[12]
Database references
SIMBADdata

HD 194012 (HR 7793; Gliese 789) is a star in the equatorial constellation Delphinus. It has an apparent magnitude of 6.15,[2] making it visible to the naked eye under ideal conditions. The star is relatively close at a distance of only 85 light years[1] but is receding with a heliocentric radial velocity of 4.5 km/s.[5]

HD 194012 has a stellar classification of F7 V,[3] indicating that it is an ordinary F-type main-sequence star. It has 121% the mass of the Sun[7] and is estimated to be a billion years old,[11] spinning with a projected rotational velocity of 5 km/s.[10] The star's diameter is 118% that of the Sun[7] and shines with a luminosity of 1.9 L☉[8] from its photosphere at an effective temperature of 6,301 K,[9] giving a yellow white hue. HD 194012's metallicity is calculated to be 87% that of the Sun.[8]

A 2010 paper has identified a candidate substellar companion 12.78″ away along a position angle of 67.9°.[13] HD 194012 has been examined for infrared excess suggesting a debris disk but none was found.[14]

  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 Cite error: The named reference Gray2003 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Marlborough1964 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 Stassun2019 was invoked but never defined (see the help page).
  8. ^ a b c d e Cite error: The named reference Luck2016 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Casagrande2011 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Kraft1967 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Dermarque2004 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Tanner2010 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Gáspár2016 was invoked but never defined (see the help page).