HD 220773

HD 220773
Observation data
Epoch J2000      Equinox J2000
Constellation Pegasus[1]
Right ascension 23h 26m 27.445s[2]
Declination +08° 38′ 37.84″[2]
Apparent magnitude (V) 7.10[1]
Characteristics
Evolutionary stage main sequence
Spectral type G0 V[3] or F9 V[4]
B−V color index 0.602±0.005[1]
Astrometry
Radial velocity (Rv)−37.735±0.0009[5] km/s
Proper motion (μ) RA: 27.096 mas/yr[2]
Dec.: −222.458 mas/yr[2]
Parallax (π)19.7694 ± 0.0669 mas[2]
Distance165.0 ± 0.6 ly
(50.6 ± 0.2 pc)
Absolute magnitude (MV)3.57[1]
Details
Mass1.154±0.003[6] M☉
Radius1.73±0.02[6] R☉
Luminosity3.16±0.01[6] L☉
Surface gravity (log g)4.02±0.01[6] cgs
Temperature5,852±26[6] K
Metallicity [Fe/H]0.09±0.06[7] dex
Rotational velocity (v sin i)3.82±1.00[8] km/s
Age6.3±0.1[6] Gyr
Other designations
BD+07 5030, Gaia DR2 2761142326076104192, HD 220773, HIP 115697, SAO 128181, 2MASS J23262744+0838376[9]
Database references
SIMBADdata

HD 220773 is a star in the northern constellation of Pegasus. It has an apparent visual magnitude of 7.10,[1] which is too faint to be visible with the naked eye. The distance to this system, as determined by parallax measurements, is 165 light years,[2] but it is drifting closer with a radial velocity of −37.7 km/s.[5] The star shows a high proper motion, traversing the celestial sphere at an angular rate of 0.187 arcsec yr−1.[10]

The spectrum of HD 220773 presents as a late type star F-type or early G-type main-sequence star with a stellar classification of F9 V[4] or G0 V,[3] respectively. It is older than the Sun, with an estimated age of 6.3 billion years,[6] and the magnetic activity in the chromosphere is at a low level.[7] The star has 15% greater mass than the Sun but the radius is 73% larger.[6] The abundance of iron, a measure of the star's metallicity, is slightly higher than solar.[7] It is radiating over three times the luminosity of the Sun from its photosphere at an effective temperature of 5,852 K.[6]

A survey in 2015 ruled out the existence of any additional stellar companions at projected distances from 31 to 337 astronomical units.[3]

  1. ^ a b c d e Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Mugrauer_Ginski_2015 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Wittrock_et_al_2017 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Soubiran_et_al_2018 was invoked but never defined (see the help page).
  6. ^ a b c d e f g h i Cite error: The named reference Bonfanti_et_al_2016 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Robertson2012 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Tejada_Arevalo_et_al_2021 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Luyten1995 was invoked but never defined (see the help page).