HD 222155

HD 222155
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 23h 38m 00.30719s[1]
Declination +48° 59′ 47.4874″[1]
Apparent magnitude (V) 7.1[2]
Characteristics
Evolutionary stage main sequence star
Spectral type G0V
B−V color index 0.64
Astrometry
Radial velocity (Rv)−44.00±0.12[1] km/s
Proper motion (μ) RA: 195.306 mas/yr[1]
Dec.: -117.335 mas/yr[1]
Parallax (π)19.8020 ± 0.0160 mas[1]
Distance164.7 ± 0.1 ly
(50.50 ± 0.04 pc)
Details[2][3][4]
Mass1.21±0.10 M☉
Radius1.85±0.04 R☉
Luminosity3.2 L☉
Surface gravity (log g)4.10±0.13 cgs
Temperature5720±44 K
Metallicity [Fe/H]-0.11±0.05 dex
Rotational velocity (v sin i)3.2±1.0 km/s
Age8.2±0.7 Gyr
Other designations
BD+48 4112, Gaia DR2 1943363751009454976, HD 222155, HIP 116616, SAO 53211, TYC 3646-2286-1, 2MASS J23380027+4859475[5]
Database references
SIMBADdata

HD 222155 is a star in the northern constellation of Andromeda.[5] It is a yellow star that can be viewed with binoculars or a small telescope, but is too faint to be seen with the naked eye at an apparent visual magnitude of 7.1. The imaging survey in 2017 did not detect any stellar companions to HD 222155.[6]

This is an old main sequence star with a stellar classification of G0V;[5] a star that is nearing an exhaustion of its hydrogen fuel. It is already beginning to expand its gaseous envelope,[2] having radius of 1.85R☉.[3] The star is relatively depleted of heavy elements, having about 80% of solar abundance, and has weak yet noticeable ultraviolet flare activity.[7][8]

  1. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Boisse2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Stassun2016 was invoked but never defined (see the help page).
  4. ^ Kokaia, Giorgi; Davies, Melvyn B.; Mustill, Alexander J. (2020), "Resilient habitability of nearby exoplanet systems", Monthly Notices of the Royal Astronomical Society, 492 (1): 352–368, arXiv:1910.07573, Bibcode:2020MNRAS.492..352K, doi:10.1093/mnras/stz3408, S2CID 204743669
  5. ^ a b c Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  6. ^ Wittrock, Justin M.; Kane, Stephen R.; Horch, Elliott P.; Howell, Steve B.; Ciardi, David R.; Everett, Mark E. (2017), "Exclusion of Stellar Companions to Exoplanet Host Stars", The Astronomical Journal, 154 (5): 184, arXiv:1709.05315v1, Bibcode:2017AJ....154..184W, doi:10.3847/1538-3881/aa8d69, S2CID 55789971
  7. ^ Evgenya L. Shkolnik, "AN ULTRAVIOLET INVESTIGATION OF ACTIVITY ON EXOPLANET HOST STARS", 2013
  8. ^ Cite error: The named reference Viswanath2020 was invoked but never defined (see the help page).