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HD 193556

HD 193556
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Delphinus
Right ascension 20h 20m 20.5234s[1]
Declination +14° 34′ 09.3206″[1]
Apparent magnitude (V) 6.17±0.01[2]
Characteristics
Spectral type G8 III[3]
U−B color index +0.67[4]
B−V color index +0.92[4]
Astrometry
Radial velocity (Rv)11.7±0.3[5] km/s
Proper motion (μ) RA: −3.887 mas/yr[1]
Dec.: +5.610 mas/yr[1]
Parallax (π)6.9878 ± 0.0252 mas[1]
Distance467 ± 2 ly
(143.1 ± 0.5 pc)
Absolute magnitude (MV)+0.04[6]
Details
Mass2.65[7] M☉
Radius11.33[8] R☉
Luminosity102[9] L☉
Surface gravity (log g)2.76[10] cgs
Temperature5,104[10] K
Metallicity [Fe/H]+0.03[10] dex
Rotational velocity (v sin i)1.5±1.2[11] km/s
Age490[7] Myr
Other designations
AG+14°2187, BD+14°4263, FK5 3629, GC 28288, HD 193556, HIP 100274, HR 7778, SAO 105988[12]
Database references
SIMBADdata

HD 193556 (HR 7778) is a solitary star in the equatorial constellation Delphinus. It has an apparent magnitude of 6.17,[2] making it visible to the naked eye under ideal conditions. Parallax measurements place the object at a distance of 467 light years[1] and it is currently receding with a heliocentric radial velocity of 11.7 km/s.[5]

HD 193556 has a stellar classification of G8 III,[3] indicating that it is a red giant. It has 2.65 times the mass of the Sun and is currently 490 million years old,[7] having expanded to 11.33 times the radius of the Sun.[8] It shines with a luminosity of 102 L☉[9] from its enlarged photosphere at an effective temperature of 5,104 K,[10] giving it a yellow glow. HD 193556 has an iron abundance around solar level[10] and spins leisurely with a poorly constrained projected rotational velocity of 1.5 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 Cite error: The named reference Harlan1969 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Fernie1983 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 Cite error: The named reference Dotter2008 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  10. ^ a b c d e Cite error: The named reference Liu2014 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference deMed1999 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).
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