Gamma Capricorni
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Capricornus |
Right ascension | 21h 40m 05.45648s[1] |
Declination | −16° 39′ 44.307184″[1] |
Apparent magnitude (V) | +3.67[2] |
Characteristics | |
Spectral type | kF0hF1VmF2[3] |
U−B color index | +0.22[4] |
B−V color index | +0.32[4] |
Variable type | |
Astrometry | |
Radial velocity (Rv) | −31.2±0.5[6] km/s |
Proper motion ( | RA: +187.56[1] mas/yr Dec.: −22.45[1] mas/yr |
Parallax ( | 20.77 ± 0.72 mas[1] |
Distance | 157 ± 5 ly (48 ± 2 pc) |
Absolute magnitude (MV) | +2.60[7] |
Details | |
Mass | 2.44[8] M☉ |
Radius | 2.35[8] R☉ |
Surface gravity (log g) | 3.69[8] cgs |
Temperature | 7,520[9] K |
Metallicity [Fe/H] | +0.5[9] dex |
Rotational velocity (v sin i) | 40[10] km/s |
Other designations | |
Nashira, Gamma Cap, Gam Cap, | |
Database references | |
SIMBAD | data |
Gamma Capricorni or
Nomenclature
[edit]It bore the traditional name Nashira, derived from the Arabic سعد ناشرة sa'd nashirah "the lucky one" or "bearer of good news". In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[13] to catalogue and standardize proper names for stars. The WGSN approved the name Nashira for this star on 21 August 2016 and it is now so included in the List of IAU-approved Star Names.[12]
In Chinese,
Namesake
[edit]Nashira (AK-85) was a United States Navy ship, though it was never commissioned and never bore the USS designation.[16][17]
Properties
[edit]This star is classified as an
References
[edit]- ^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv:0708.1752, Bibcode:2007A&A...474..653V, doi:10.1051/0004-6361:20078357, S2CID 18759600.
- ^ Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
- ^ Abt, Helmut A.; Morrell, Nidia I. (1995). "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars". Astrophysical Journal Supplement. 99: 135. Bibcode:1995ApJS...99..135A. doi:10.1086/192182.
- ^ a b 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): 99. Bibcode:1966CoLPL...4...99J.
- ^ a b Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
- ^ a b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
- ^ a b Eggen, Olin J. (July 1998), "The Age Range of Hyades Stars", The Astronomical Journal, 116 (1): 284–292, Bibcode:1998AJ....116..284E, doi:10.1086/300413.
- ^ a b c d e Glagolevskij, Yu. V. (January 2019). "On Properties of Main Sequence Magnetic Stars". Astrophysical Bulletin. 74 (1): 66–79. Bibcode:2019AstBu..74...66G. doi:10.1134/S1990341319010073. S2CID 149900274.
- ^ a b 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 (3): 897–911. arXiv:astro-ph/0205255. Bibcode:2002A&A...393..897R. doi:10.1051/0004-6361:20020943. S2CID 14070763.
- ^ "gam Cap". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-06-20.
- ^ a b "Naming Stars". IAU.org. Retrieved 7 March 2018.
- ^ IAU Working Group on Star Names (WGSN), International Astronomical Union, retrieved 22 May 2016.
- ^ (in 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. - ^ (in Chinese)
香港 太 空 館 -研究 資源 -亮 星 中 英 對照 表 Archived January 30, 2011, at the Wayback Machine, Hong Kong Space Museum. Accessed on line November 23, 2010. - ^ "Ship Naming in the United States Navy". Naval History & Heritage Command. Archived from the original on 3 January 2015.
- ^ "NavSource Online: Service Ship Photo Archive: AK-85 Nashira". navsource.org. Retrieved 28 December 2016.
- ^ Carrier, F.; North, P.; Udry, S.; Babel, J. (October 2002). "Multiplicity among chemically peculiar stars. II. Cool magnetic Ap stars". Astronomy and Astrophysics. 394: 151–169. arXiv:astro-ph/0208082. Bibcode:2002A&A...394..151C. doi:10.1051/0004-6361:20021122. S2CID 14223227.
External links
[edit]- Kaler, James B. "Nashira". STARS. Retrieved 2021-06-21.