Gamma Capricorni
Coordinates: 21h 40m 05.5s, −16° 39′ 44″
Gamma Capricorni is at left center. | |
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Capricornus |
Right ascension | 21h 40m 05.4563s[1] |
Declination | −16° 39′ 44.308″[1] |
Apparent magnitude (V) | +3.69 |
Characteristics | |
Spectral type | A7mp[2] |
U−B color index | +0.22[3] |
B−V color index | +0.32[3] |
Astrometry | |
Radial velocity (Rv) | −31.2[4] km/s |
Proper motion (μ) | RA: 187.39[1] mas/yr Dec.: −22.33[1] mas/yr |
Parallax (π) | 23.48 ± 1.10[1] mas |
Distance | 139 ± 7 ly (43 ± 2 pc) |
Details | |
Surface gravity (log g) | 3.95[5] cgs |
Temperature | 7,520[5] K |
Metallicity | [5] |
Rotational velocity (v sin i) | 40[6] km/s |
Other designations | |
Gamma Capricorni (γ Cap, γ Capricorni) is a giant star in the constellation Capricornus. It has the traditional name Nashira, which comes from the Arabic سعد ناشرة - sa'd nashirah for "the lucky one" or "bearer of good news".
In Chinese, 壘壁陣 (Lěi Bì Zhèn), meaning Line of Ramparts, refers to an asterism consisting of γ Capricorni, κ Capricorni, ε Capricorni, δ Capricorni, ι Aquarii, σ Aquarii, λ Aquarii, φ Aquarii, 27 Piscium, 29 Piscium, 33 Piscium and 30 Piscium.[7] Consequently, γ Capricorni itself is known as 壘壁陣三 (Lěi Bì Zhèn sān, English: the Third Star of Line of Ramparts.)[8]
Because it is near the ecliptic, γ Capricorni can be occulted by the Moon, and (rarely) by planets.
γ Capricorni is a blue-white A-type (A7III) giant star with a mean apparent magnitude of +3.69. It is approximately 139 light years from Earth. It is classified as an Alpha2 Canum Venaticorum type variable star and its brightness varies by 0.03 magnitudes.
Nashira as the name
Nashira (AK-85) is once of United States navy ship.
References
- 1 2 3 4 5 Perryman, M. A. C.; et al. (July 1997). "The HIPPARCOS Catalogue". Astronomy & Astrophysics 323: L49–L52. Bibcode:1997A&A...323L..49P.
- 1 2 "HD 206088 -- Variable Star of alpha2 CVn type". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2009-11-12.
- 1 2 Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory 4 (99). Bibcode:1966CoLPL...4...99J.
- ↑ Wilson, Ralph Elmer (1953). General catalogue of stellar radial velocities. Carnegie Institution of Washington. Retrieved 2007-05-14.
- 1 2 3 Burkhart, C.; Coupry, M. F. (September 1991). "The A and Am-Fm stars. I - The abundances of Li, Al, Si, and Fe". Astronomy and Astrophysics 249 (1): 205–216. Bibcode:1991A&A...249..205B.
- ↑ Royer, F.; Grenier, S.; Baylac, M.-O.; Gómez, A. E.; Zorec, J. (October 2002). "Rotational velocities of A-type stars in the northern hemisphere. II. Measurement of v sin i". Astronomy and Astrophysics 393: 897–911. arXiv:astro-ph/0205255. Bibcode:2002A&A...393..897R. doi:10.1051/0004-6361:20020943.
- ↑ (Chinese) 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, ISBN 978-986-7332-25-7.
- ↑ (Chinese) 香港太空館 - 研究資源 - 亮星中英對照表, Hong Kong Space Museum. Accessed on line November 23, 2010.
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