HD 212771

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HD 212771
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 22h 27m 03.07s[1]
Declination −17° 15′ 49.16″[1]
Apparent magnitude (V) 7.60±0.01[2]
Characteristics
Spectral type G8IV[3]
Astrometry
Radial velocity (Rv)14.99±0.15[1] km/s
Parallax (π)8.9678 ± 0.0437[1] mas
Distance364 ± 2 ly
(111.5 ± 0.5 pc)
Details
Mass1.42±0.07[4] M☉
Radius4.41+0.06
−0.08[1] R☉
Luminosity11.55±0.08[1] L☉
Surface gravity (log g)3.22±0.07[5] cgs
Temperature5026+42.26
−38.75[1] K
Metallicity [Fe/H]−0.09±0.01[5] dex
Age1.676±0.287[5] Gyr
Other designations
BD−17 6526, HD 212771, HIP 110813, SAO 165086
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

HD 212771 is a solitary star in the zodiac constellation Aquarius. With an apparent magnitude of 7.60, it can only be seen with binoculars. This star is located 364 light years away based on parallax, but is drifting away with a radial velocity of 15 km/s.

Properties[]

HD 212771 has a classification of “G8 IV”, which suggests it is evolving away from the main sequence after being an A-type star. It has twice the Sun’s mass, and 4 times the Sun's radius. It radiates at 11 solar luminosities, and has an effective temperature of 5,026 K, which gives HD 212771 a yellow-hue. HD 212771 is estimated to a billion years old.

Planetary system[]

HD 212771 has a Jovian companion discovered in 2010 via Doppler spectroscopy. Not a lot of parameters are known about the planet.

The HD 212771 planetary system
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 2.39 MJ 1.24 380.7 0.07 — —

References[]

  1. ^ a b c d e f g h 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. ^ a b Hog, E. (March 2, 2000), "The Tycho-2 catalogue of the 2.5 million brightest stars.", Astronomy and Astrophysics, 355: L27-30, Bibcode:2000A&A...355L..27H
  3. ^ a b Houk, N.; Smith-Moore, M. (1988), "Catalogue of two-dimensional spectral types for the HD stars, Vol.4", Michigan Spectral Survey, 4, Bibcode:1988MSS...C04....0H
  4. ^ a b Campante, Tiago L.; Corsaro, Enrico; Lund, Mikkel N.; Mosser, Benoît; Serenelli, Aldo; Veras, Dimitri; et al. (October 2019), "TESS Asteroseismology of the Known Red-giant Host Stars HD 212771 and HD 203949", The Astrophysical Journal, 885 (1): 31, arXiv:1909.05961, Bibcode:2019ApJ...885...31C, doi:10.3847/1538-4357/AB44A8
  5. ^ a b c d Ghezzi, L. (June 2018), "Retired A Stars Revisited: An Updated Giant Planet Occurrence Rate as a Function of Stellar Metallicity and Mass", The Astrophysical Journal, 860 (2): 18, arXiv:1804.09082, Bibcode:2018ApJ...860..109G, doi:10.3847/1538-4357/aac37c, S2CID 118969017
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