Gamma Boötis
 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 |
| Characteristics | |
| 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] |
| Astrometry | |
| 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) |
| Details | |
| Luminosity | 34[1] L☉ |
| Temperature | 7,800[1] K |
| Rotational velocity (v sin i) | 140[1] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) | |
Gamma Boötis (γ Boötis, abbreviated Gamma Boo, γ Boo), also named Seginus,[2] is a star in the constellation of Boötes. Approximately 85 light years away from the Sun, it belongs to the spectral class A7III and 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.
Nomenclature
γ Boötis (Latinised to Gamma Boötis) is the star's Bayer designation.
It bore the traditional names Seginus (alternatively Segin, Ceginus) of uncertain origin and was listed as Haris in Bečvář. Seginus possibly resulted from Latinization of an Arabic form of the Greek name of the constellation of Boötes - Theguius. Haris comes from the Arabic name of the constellation of Boötes, Al Haris Al Sama meaning "the guard". In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[3] to catalogue and standardize proper names for stars. The WGSN approved the name Seginus for this star on 21 August 2016 and it is now so entered in the IAU Catalog of Star Names.[2]
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]
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).[5] 招搖 (Zhāoyáo), westernized into Chaou Yaou, but the name Chaou Yaou was designated for Beta Boötis (Nekkar) by R.H. Allen and the meaning is "to beckon, excite, or move." [6]
In culture
USS Seginus (AK-133) was a United States Navy Crater class cargo ship named after the star.
References
- 1 2 3 4 5 6 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
- 1 2 "IAU Catalog of Star Names". Retrieved 28 July 2016.
- ↑ "IAU working group on star names (WGSN)". Retrieved 22 May 2016.
- ↑ 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.
- ↑ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 29 日
- ↑ Richard Hinckley Allen: Star Names — Their Lore and Meaning: Boötes