HD 15920

HD 15920
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 02h 38m 02.03097s[1]
Declination +72° 49′ 05.7106″[1]
Apparent magnitude (V) 5.17[2]
Characteristics
Spectral type G8III[3]
B−V color index +0.896±0.003[2]
Astrometry
Radial velocity (Rv)−3.69±0.13[1] km/s
Proper motion (μ) RA: −27.441[1] mas/yr
Dec.: +15.627[1] mas/yr
Parallax (π)12.1723 ± 0.1139 mas[1]
Distance268 ± 3 ly
(82.2 ± 0.8 pc)
Absolute magnitude (MV)0.70[2]
Details
Mass2.55±0.68[4] M☉
Radius10.06+0.15
−0.17[1] R☉
Luminosity60.7±0.7[1] L☉
Surface gravity (log g)2.91±0.11[4] cgs
Temperature5,080+37
−42[1] K
Metallicity [Fe/H]0.02±0.05[4] dex
Age977+198
−164[4] Myr
Other designations
BD+72°140, FK5 87, GC 3116, HD 15920, HIP 12273, HR 743, SAO 4694, GSC 04320-02109[5]
Database references
SIMBADdata

HD 15920 is a single[6] star in the northern constellation of Cassiopeia. It has a yellow hue and is visible to the naked eye as a dim point of light with an apparent visual magnitude of 5.17.[2] This object is located at a distance of approximately 268 light years from the Sun based on parallax, but it is drifting closer with a radial velocity of −4 km/s.[1]

This object is an aging giant star with a stellar classification of G8III.[3] After exhausting the supply of hydrogen at its core, this star has cooled and expanded off the main sequence – at present it has ten times the girth of the Sun.[1] The star is around a billion years old[4] with 2.6[4] times the mass of the Sun. It is radiating 61 times the Sun's luminosity from its swollen photosphere at an effective temperature of 5,080 K.[1] HD 15920 is the most likely source for the X-ray emission detected at these coordinates.[7]

  1. ^ a b c d e f g h i j k l Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Roman1952 was invoked but never defined (see the help page).
  4. ^ a b c d e f Cite error: The named reference Feuillet2016 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Haakonsen2009 was invoked but never defined (see the help page).