HD 27631

HD 27631
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Horologium
Right ascension	04h 19m 45.46931s[1]
Declination	–41° 57′ 36.9515″[1]
Apparent magnitude (V)	8.243±0.012[2]
Characteristics
Spectral type	G3IV[2]
B−V color index	0.721±0.009[2]
Astrometry
Proper motion (μ)	RA: –41.229 ± 0.054[1] mas/yr ; Dec.: –91.988 ± 0.067[1] mas/yr
Parallax (π)	19.8573 ± 0.0323[1] mas
Distance	164.3 ± 0.3 ly ; (50.36 ± 0.08 pc)
Details[2]
Mass	0.944±0.032 M☉
Radius	0.923±0.033 R☉
Surface gravity (log g)	4.455±0.038 cgs
Temperature	5,737±36 K
Metallicity [Fe/H]	−0.12±0.05 dex
Rotation	~31 d
Age	4.010±2.892 Gyr
Other designations
	CD−42°1464, HD 27631, HIP 20199, SAO 216753
Database references
SIMBAD	data
Exoplanet Archive	data
Extrasolar Planets; Encyclopaedia	data

HD 27631 is a G-class yellow dwarf star located 164.3 ± 0.3 light-years from Earth.[1] It is smaller and cooler than the Sun, with 0.94 ± 0.04 of its mass and a surface temperature of 5737±36 K. It is thought to be 4.4 ± 3.6 billion years old.[3]

A 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[2]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	≥ 1.494±0.042 M_J	3.242+0.070 −0.068	2198.14+54.11 −50.34	0.141+0.062 −0.065	—	—

References

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.
Barbato, D.; et al. (August 2018). "Exploring the realm of scaled solar system analogues with HARPS". Astronomy & Astrophysics. 615: 21. arXiv:1804.08329. Bibcode:2018A&A...615A.175B. doi:10.1051/0004-6361/201832791. A175.
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. S2CID 59467665.
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): 3127–3136. doi:10.1093/mnras/stv771. Retrieved 19 June 2020.

External links

"HD 27631 b".

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[GaiaDR2-1] 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.

[Barbato_et_al_2018-2] Barbato, D.; et al. (August 2018). "Exploring the realm of scaled solar system analogues with HARPS". Astronomy & Astrophysics. 615: 21. arXiv:1804.08329. Bibcode:2018A&A...615A.175B. doi:10.1051/0004-6361/201832791. A175.

[Marmier2013-3] 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. S2CID 59467665.

[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): 3127–3136. doi:10.1093/mnras/stv771. Retrieved 19 June 2020.