HD 109271

HD 109271
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Virgo
Right ascension	12h 33m 35.5543s[1]
Declination	−11° 37′ 18.7272″[1]
Apparent magnitude (V)	8.05 ± 0.01[2]
Characteristics
Spectral type	G5 V[2]
B−V color index	+0.658 ± 0.002[2]
Astrometry
Radial velocity (Rv)	−5.10 ± 0.3[3] km/s
Proper motion (μ)	RA: −169.693±0.114[1] mas/yr ; Dec.: 80.882±0.108[1] mas/yr
Parallax (π)	17.8697 ± 0.0660[1] mas
Distance	182.5 ± 0.7 ly ; (56.0 ± 0.2 pc)
Absolute magnitude (MV)	4.1 ± 0.1[2]
Details[2]
Mass	1.047 ± 0.024 M☉
Luminosity	2.0 ± 0.3 L☉
Surface gravity (log g)	4.28 ± 0.10 cgs
Temperature	5783 ± 62 K
Metallicity [Fe/H]	0.10 ± 0.05 dex
Rotational velocity (v sin i)	2.7 km/s
Age	7.3 ± 1.2 Gyr
Other designations
	BD−10° 3494, HIP 61300, SAO 157362, LTT 4770
Database references
SIMBAD	data
Exoplanet Archive	data
Extrasolar Planets; Encyclopaedia	data

HD 109271 is a star in the constellation of Virgo. With an apparent magnitude of 8.05,[2] it cannot be seen with the naked eye. Parallax measurements made by Gaia put the star at a distance of 182 light-years (56.0 parsecs) away.[1]

HD 109271 is a typical G-type main-sequence star. It has a mass of 1.047 M_☉, but is twice as luminous as the Sun. It is also much older, at an age of 7.3 billion years.[2]

Planetary system

From 2003 to 2012, the star was under observance from the High Accuracy Radial Velocity Planet Searcher (HARPS).[2]

In 2012, two eccentric hot Neptune-mass planets were deduced by radial velocity. They were published in January 2013. These are close to a 1:4 resonance. The system is like HD 69830.

A third Neptune in the Venus zone was hypothesised from the data.

The HD 109271 planetary system[4][2]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	>0.054 ± 0.004 M_J	0.079 ± 0.001	7.8543 ± 0.0009	0.25 ± 0.08	—	—
c	>0.076 ± 0.007 M_J	0.196 ± 0.003	30.93 ± 0.02	0.15 ± 0.09	—	—
d (unconfirmed)	>1.3 neptune M_J	1	430	0.36	—	—

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.
G. Lo Curto; et al. (2013). "The HARPS search for southern extrasolar planets: XXXVI. New multi-planet systems in the HARPS volume limited sample: a super-Earth and a Neptune in the habitable zone". Astronomy & Astrophysics. 551: A59. arXiv:1301.2741. Bibcode:2013A&A...551A..59L. doi:10.1051/0004-6361/201220415.
Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
"Planet HD 109271 b". The Extrasolar Planets Encyclopaedia. Retrieved 3 September 2017.

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[Gaia_DR2-1] 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.

[HARPS-2] G. Lo Curto; et al. (2013). "The HARPS search for southern extrasolar planets: XXXVI. New multi-planet systems in the HARPS volume limited sample: a super-Earth and a Neptune in the habitable zone". Astronomy & Astrophysics. 551: A59. arXiv:1301.2741. Bibcode:2013A&A...551A..59L. doi:10.1051/0004-6361/201220415.

[Gontcharov-3] Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.

[exoplaneteu-4] "Planet HD 109271 b". The Extrasolar Planets Encyclopaedia. Retrieved 3 September 2017.