Ursa Minor Beta

Ursa Minor beta star [1] Beta Ursae Minoris
Temporary mark, another name	Kochab [2], Kochab[3][4]
Constellation	Ursa Minor
Apparent magnitude (V)	2.078[1] 2.02 - 2.08 (strange light) [5]
Variable star type	It is suspicious [5]
Classification	Orange big star
Position Epoch: J2000.0[1]
Right ascension (RA,α)	14h 50m 42.32580s [1]
Declination (Dec,δ)	+ 74° 09′ 19.8142″[1]
Red shift	0.000057[1]
Radial velocity (Rv)	16.96km/s [1]
Proper motion (μ)	Right ascension: -32.61 milliseconds / year [1] Declination: 11.42 milliseconds / year [1]
Annual parallax (π)	24.91 +-0.12 milliseconds [1]
Distance	130.87 +-0.63 light-year [note 1] (40.14+-0.19 parsec) [note 1]
Absolute magnitude (MV)	-0.940[note 2]
Position of the beta star
Physical property
Radius	42.06 +-0.91 R☉[6]
Mass	1.4 +-0.2 M☉[6]
Surface gravity	1.39 +-0.06 cgs[6]
Rotation speed	1.7 km/s[6]
Rotation period	625-6457 days [6]
Spectral class	K4III [1]
The intensity of light	537.07 L☉[6]
Surface temperature	4,150 K[6]
Color index (B-V)	+ 1.47[7]
Color index (U-B)	+ 1.78[7]
Color index (R-I)	+ 0.76[7]
Age	2.95 ± 1.03*109 year [6]
The other name
The other name	Ursa Minor seventh star [1] BD +74 595 [1] FK5 550 [1], HD 131873 [1] HIP 72607 [1], HR 5563 [1] SAO 8102 [1] NSV 6846 [1]
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An Ursa Minor beta star is a second class star at a fixed star of Ursa Minor. There is it in the row of the star which can be called the small Big Dipper of Ursa Minor one size smaller than the Big Dipper, and there is it in the point of the water drawer of the ladle.

Table of contents

Characteristic

With an Ursa Minor gamma star, it was the polestar by precession of the earth from about B.C. 1500 through Christian era about 500. The polestar before one is a Draco alpha star, and the polestar after one is current Polaris.

I exhaust hydrogen, and a stage to burn with helium melting into a nucleus begins now. In addition, I have the property as the barium star as well as Hydra alpha star Alphard. The main star which was bigger than this fixed star at the time becomes a big star and reaches death, and it is thought that a material brought about in the process might flow [⁸].

Name

The scientific name an Ursa Minor beta star (βUrsa Minoris, abbreviated designation βUMi). Kochab [²] (Kochab^[3][4]) of the inherent name Oh, it is thought that a part of kaukab (star) of Al kaukab al shamaliyy meaning "a north star" in Arabic was left [²]; [³]. For another view, come from Alrucaba which is another name for Polaris again; is turned on [³]. On July 20, 2016, the working group (Working Group on Star Names, WGSN) about the naming of the fixed star of International Astronomical Union approved Kochab as the inherent name of the Ursa Minor beta star formally [⁴].

This record of wins and losses with an Ursa Minor gamma star "the guardian of the pole" (Guards of the Pole^[7]) と is called [²]. Said, for the spirited star who can see it by the naked eye around polestar Polaris, to be because the polestar is the nearest [²].

There is the name in old China, too, and an emperor is Kochab among North Pole five planets (the Crown Prince, emperor, bastard, Empress, the polestar). This is Lord of Heaven (Taichi (Daiichi) タイチー, origin of the universe, 太乙) namely an Emperor great emperor. It was said that 所臣 including the Big Dipper went around the people and protected it.

Planetary system

In 2014, one extrasolar planet was discovered in the Ursa Minor beta star.

Planet [⁶] of the Ursa Minor Beta

Name (order near the fixed star)	Mass	Orbit semimajor axis （Au）	Revolution period (Day)	Orbit eccentricity	Orbit angle of inclination	Radius
b	>6.1 ± 1.0 MJ	1.4 +-0.1	522.3 +-2.7	0.19 +-0.02	—	—

Footnote

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Explanatory note

1. The ^ ^{a b} parsec calculates calculation (as for the error, like), light-year than parsec *3.26 than 1/ annual parallax (second). Each effective figure decimal second place
2. I calculate from ^ apparent magnitude +5 + 5* log (annual parallax (second)). The effective figure decimal third place

Source

1. ^ ^{a b c d e f g h i j k l m n o p q r s} "SIMBAD Astronomical Database". Results for bet UMi. February 7, 2013 reading.
2. Revised edition fourth impression, page 134 redecorated on ^ ^{a b c d e} Megumi Hara "meaning 恒星社厚生閣 of history of myth - constellation and Hoshina of the constellation", February 28, 2007. ISBN 978-4-7699-0825-8。
3. ^ ^{a b c d} Paul Kunitzsch; Tim Smart (2006). A Dictionary of Modern Star Names. Sky Publishing. p. 58. ISBN 978-1 - 931,559-44-7. 
4. ^ ^{a b c} "IAU Catalog of Star Names". International Astronomical Union. December 4, 2016 reading.
5. ^ ^{a b} "NSV". Results for NSV 6846. October 20, 2015 reading.
6. ^ ^{a b c d e f g h i} B.-C. Lee et al. (May 9, 2014). It is arXiv: "Planetary companions in K giantsβCancri,μLeonis, andβUrsae Minoris*" 1405.2127v1 [astro-ph.EP]. 
7. ^ ^{a b c d} 輝星星表The fifth edition
8. ^ Jim Kaler (December 20, 2013). "Kochab". STARS. December 4, 2016 reading.

Allied item

• List of bright fixed stars

Predecessors in the family line: Draco alpha star

The polestar B.C. 1500–500 years

The next era: Polaris

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