HD 13931

HD 13931
Constellation	Andromeda
Apparent magnitude (V)	7.61 (±0.03) [1]
Position Epoch: J2000.0
Right ascension (RA,α)	02h 16m 47.4s [2]
Declination (Dec,δ)	43° 46′ 23″ [2]
Radial velocity (Rv)	33.7 (+-4.6) km/s [2]
Proper motion (μ)	Right ascension: 99 milliseconds / year [2] Declination: -184 milliseconds / year [2]
Annual parallax (π)	22.6 (+-0.7) a millisecond [1]
Distance	144 (±5) Light-year 44.2 (+-1.4) a parsec [1]
Absolute magnitude (MV)	4.32 (+-0.10)
Physical property
Radius	1.23 (+-0.06) R☉[1]
Mass	1.022 (+-0.02) M☉[1]
Surface gravity	(log g) 4.30 (+-0.08) [1]
Rotation period	Approximately 26 days [1]
Spectral class	G0 [1] [2]
The intensity of light	1.57 (+-0.14) L☉[1]
Surface temperature	5829 (+-44) K [1]
Color index (B-V)	0.642 (±0.015) [1]
Quantity of metal [Fe/H]	[Fe/H] 0.03 (+-0.04) [1]
Age	8,400 million (+-2,000,000,000) year [1]
The other name
The other name	HIP 10626, BD+43 459, SAO 37918 [2]
■Project ■ Template

HD 13931 is the fixed star of the G type at the approximately 144 light-year away position from the solar system in the direction of Andromeda. I cannot see the apparent magnitude by the naked eye in 7.6 and gloomy one. I am known to have one planet as of 2010.

Characteristic

HD 13931 is a fixed star of the spectral class G type same as the sun, and the metal quantity is observed with degree same as the sun, too, but, as for the intensity of light, there is greatly a radius around 1.57 times of the sun. Because I am slightly more spirited than the standard main sequence star of activity of the chromosphere being calm, and rotation speed being slow and the same spectral class, it is thought with a star aged than the sun (4,600 million years old), and the age is estimated with 10,400 million years old from 6,400 million [¹].

In 2010, extrasolar planet HD 13931 b over this fixed star was reported. HD 13931 b revolves in circular orbit of radius 5.2AU on a huge planet of the mass 2 times as large as Jupiter for 11.5 years. Because this planet has the property of the solar system similar to the Jupiter; called "analog of the Jupiter" [¹].

Planet of HD 13931

Name (order near the fixed star)	Mass	Orbit semimajor axis （Au）	Revolution period (Day)	Orbit eccentricity	Orbit angle of inclination	Radius
b	>1.88 MJ	5.15	4218	0.02	—	—

References

1. ^ ^{a b c d e f g h i j k l m n o} Howard, A. H. et al. (2010). It is arXiv: "The California Planet Survey I. Four New Giant Exoplanets" 1003.3488v1. 
2. ^ ^{a b c d e f g} "SIMBAD query result". SIMBAD, CDS. March 25, 2010 reading.

Allied item

• HD 13931 b
• List of extrasolar planets

It is acquired by "https://ja.wikipedia.org/w/index.php?title=HD_13931&oldid=47269555"

This article is taken from the Japanese Wikipedia HD 13931

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