HD 222155

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 detected any stellar companions to HD 222155.[6]

HD 222155
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 23h 38m 00.3072s[1]
Declination +48° 59′ 47.4865″[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)-43.979[1] km/s
Proper motion (μ) RA: 195.300[1] mas/yr
Dec.: -117.266[1] mas/yr
Parallax (π)19.7309 ± 0.0321[1] mas
Distance165.3 ± 0.3 ly
(50.68 ± 0.08 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

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]

Planetary system

Based on radial velocity data gathered in 2007-2011, the discovery of a superjovian planet b outside the habitable zone[4] was announced in May 2012.[2] The stellar and planetary parameters were refined in 2016.[3]

The HD 222155 planetary system[9][3][8]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 2.12±0.5 MJ 5.221±0.4579 3999±541 0.16±0.22 — —

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. Boisse, I.; Pepe, F.; Perrier, C.; Queloz, D.; Bonfils, X.; Bouchy, F.; Santos, N. C.; Arnold, L.; Beuzit, J. -L.; Dìaz, R. F.; Delfosse, X.; Eggenberger, A.; Ehrenreich, D.; Forveille, T.; Hébrard, G.; Lagrange, A. -M.; Lovis, C.; Mayor, M.; Moutou, C.; Naef, D.; Santerne, A.; Ségransan, D.; Sivan, J. -P.; Udry, S. (2012), "The SOPHIE search for northern extrasolar planets V. Follow-up of ELODIE candidates: Jupiter-analogs around Sun-like stars", Astronomy and Astrophysics, 545: A55, arXiv:1205.5835, Bibcode:2012A&A...545A..55B, doi:10.1051/0004-6361/201118419, S2CID 119109836
  3. Stassun, Keivan G.; Collins, Karen A.; Gaudi, B. Scott (2016), "Accurate empirical radii and masses of planets and their host stars with Gaia parallaxes", The Astronomical Journal, 153 (3): 136, arXiv:1609.04389, doi:10.3847/1538-3881/aa5df3, S2CID 119219062
  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. "HD 222155". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 17 September 2020.
  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, arXiv:1709.05315v1
  7. Evgenya L. Shkolnik, "AN ULTRAVIOLET INVESTIGATION OF ACTIVITY ON EXOPLANET HOST STARS", 2013
  8. Viswanath, Gayathri; Narang, Mayank; Manoj, P.; Mathew, Blesson; Kartha, Sreeja S. (2020), "A statistical search for Star-Planet Interaction in the UltraViolet using GALEX", The Astronomical Journal, 159 (5): 194, arXiv:2003.03349v1, Bibcode:2020AJ....159..194V, doi:10.3847/1538-3881/ab7d3b, S2CID 212628609
  9. Planet HD 222155 b on exoplanet.eu

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