Gamma Boötis

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γ Boötis
Boötes constellation map.png
γ Boötis (upper center)
Observation data
Epoch J2000      Equinox J2000
Constellation Boötes
Right ascension 14h 32m 04.6719s
Declination +38° 18′ 29.709″
Apparent magnitude (V) +3.0
Spectral type A7 III[1]
U−B color index +0.12
B−V color index +0.19
R−I color index +0.08
Variable type Delta Scuti variable[1]
Radial velocity (Rv) -36.5 km/s
Proper motion (μ) RA: -115.55 mas/yr
Dec.: 151.87 mas/yr
Parallax (π) 38.29 ± 0.73 mas
Distance 85 ± 2 ly
(26.1 ± 0.5 pc)
Luminosity 34[1] L
Temperature 7,800[1] K
Rotational velocity (v sin i) 140[1] km/s
Other designations
Seginus, Haris, Ceginus, Segin, 27 Boötis, HR 5435, HD 127762, BD+38°2565, FK5 535, HIP 71075, SAO 64203.
Database references
Data sources:
Hipparcos Catalogue,
CCDM (2002),
Bright Star Catalogue (5th rev. ed.)

Gamma Boötis (γ Boo, γ Boötis) is a star in the constellation Boötes. It has the traditional name Seginus (also Segin, Ceginus) of uncertain origin. It was listed as Haris in Bečvář.


Gamma Boötis is approximately 85 light years away from Earth. It belongs to the spectral class A7III. It is a Delta Scuti type variable star with a period of 1.13 hours.[1] Its brightness varies from magnitude +3.02 to +3.07.


In Chinese astronomy, Seginus is called 招搖, Pinyin: Zhāoyáo, meaning Twinkling Indicator, because this star is marking itself and stand alone in Twinkling Indicator asterism, Root mansion (see : Chinese constellation).[2] 招搖 (Zhāoyáo), westernized into Chaou Yaou, but the name Chaou Yaou was designated for β Boötis (Nekkar) by R.H. Allen and the meaning is "to beckon, excite, or move." [3]

In the catalogue of stars in the Calendarium of Al Achsasi al Mouakket, this star was designated Menkib al Aoua al Aisr (منكب العواء الأيسر - mankibu lʿawwaaʾi lʾaysar), which was translated into Latin as Humerus Sinister Latratoris, meaning the left shoulder of barker.[4]

The name Seginus resulted from Latinization of an Arabic form of the Greek name of the constellation of Boötes (Theguius). The name Haris comes from the Arabic name of the constellation of Boötes, Al Haris Al Sama, which means "the guard".


USS Seginus (AK-133) was a United States Navy Crater class cargo ship named after the star.


  1. ^ a b c d e f Balona, L. A.; Dziembowski, W. A. (October 1999), "Excitation and visibility of high-degree modes in stars", Monthly Notices of the Royal Astronomical Society, 309 (1): 221–232, Bibcode:1999MNRAS.309..221B, doi:10.1046/j.1365-8711.1999.02821.x 
  2. ^ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 29 日
  3. ^ Richard Hinckley Allen: Star Names — Their Lore and Meaning: Boötes
  4. ^ Knobel, E. B. (June 1895). "Al Achsasi Al Mouakket, on a catalogue of stars in the Calendarium of Mohammad Al Achsasi Al Mouakket". Monthly Notices of the Royal Astronomical Society. 55: 429. Bibcode:1895MNRAS..55..429K. doi:10.1093/mnras/55.8.429. 

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