HD 27631

HD 27631 is a G-class yellow dwarf star located 164.3 ± 0.3 light-years from Earth.[2] It is smaller and cooler than the Sun, with 0.94 ± 0.04 of its mass and a surface temeperature of 5737±36 K. It is thought to be 4.4 ± 3.6 billion years old.[3]

HD 27631
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Horologium
Right ascension  04h 19m 45.469s[1]
Declination –41° 57′ 36.97″[1]
Apparent magnitude (V) +8.26
Characteristics
Spectral type G3IV
Astrometry
Proper motion (μ) RA: –41.229 ± 0.054[2] mas/yr
Dec.: –91.988 ± 0.067 [2] mas/yr
Parallax (π)19.8573 ± 0.0323[2] mas
Distance164.3 ± 0.3 ly
(50.36 ± 0.08 pc)
Details
Mass0.94 ± 0.04 M☉
Radius1 R☉
Luminosity0.88 L☉
Surface gravity (log g)4.48 ± 0.09 cgs
Temperature5737 ± 36 K
Metallicity [Fe/H]–0.12 ± 0.05 dex
Age4.4 ± 3.6 Gyr
Other designations
CD−42° 1464, HIP 20199, SAO 216753
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

The survey in 2015 have ruled out the existence of any stellar companions at projected distances above 40 astronomical units.[4]

Planetary system

From 1998 to 2012, the star was under observance from "the CORALIE echelle spectrograph at La Silla Observatory".

In 2012, a long-period, wide-orbiting exoplanet was deduced by radial velocity. This was published in November.[3]

The HD 27631 planetary system[3][5]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b >1.45 ± 0.14 MJ 3.25 ± 0.07 2208 ± 66 0.12 ± 0.06 — —

References
  1. van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.Vizier catalog entry
  2. 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.
  3. Marmier, M.; et al. (2013). "The CORALIE survey for southern extrasolar planets XVII. New and updated long period and massive planets". Astronomy and Astrophysics. 551. A90. arXiv:1211.6444. Bibcode:2013A&A...551A..90M. doi:10.1051/0004-6361/201219639.
  4. Mugrauer, M.; Ginski, C. (12 May 2015). "High-contrast imaging search for stellar and substellar companions of exoplanet host stars". Monthly Notices of the Royal Astronomical Society. 450 (3). doi:10.1093/mnras/stv771. Retrieved 19 June 2020.
  5. "hd_27631_b".
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