Gamma Capricorni
Template:Short description Template:Sky
Template:Location mark Location of γ Capricorni (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Capricornus |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | +3.67[2] |
| Characteristics | |
| Spectral type | kF0hF1VmF2[3] |
| U−B Template:Engvar | +0.22[4] |
| B−V Template:Engvar | +0.32[4] |
| Variable type | α2 CVn[5] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[6] km/s |
| Proper motion (μ) | RA: +187.56[1] mas/yr Dec.: −22.45[1] mas/yr |
| Parallax (π) | 20.77±0.72 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +2.60[7] |
| Details | |
| Mass | 2.44[8] Template:Solar mass |
| Radius | 2.35[8] Template:Solar radius |
| 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 |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist | |
| Database references | |
| SIMBAD | data |
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Gamma Capricorni or γ Capricorni, formally named Nashira (Template:IPAc-en),[11] is a star in the constellation of Capricornus. Based on parallax measurements obtained during the Hipparcos mission, it is located at a distance of approximately 157 light-years from the Sun. The star is drifting closer with a radial velocity of −31 km/s.[6] It is 2.56 degrees south of the ecliptic, so it can be occulted by the Moon, and (rarely) by planets.
Nomenclature
γ Capricorni (Latinised to Gamma Capricorni) is the star's Bayer designation.
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)[12] 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.[11]
In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Line of Ramparts, refers to an asterism consisting of Gamma Capricorni, Kappa Capricorni, Epsilon Capricorni, Delta Capricorni, Iota Aquarii, Sigma Aquarii, Lambda Aquarii, Phi Aquarii, 27 Piscium, 29 Piscium, 33 Piscium and 30 Piscium.[13] Consequently, the Chinese name for Gamma Capricorni itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx).[14]
Namesake
Nashira (AK-85) was a United States Navy ship, though it was never commissioned and never bore the USS designation.[15][16]
Properties
γ Capricorni is classified as a hot chemically peculiar Am star with a mean apparent magnitude of +3.67. The spectrum displays abundance anomalies of the elements strontium, chromium, and europium.[8] It was first classified as an Am star in 1965 by K. Osawa, but in 1974 C. Bertaud and M. Floquet found it to be an Ap star with a strontium abundance anomaly. In 1998, F. A. Catalano and associates found a slight variability in the infrared J band with a period of 2.78 days, which suggests the Ap classification is correct. However, no magnetic field is detected, which points to the Am classification, as does the infrared spectrum. The star displays large radial velocity variations, which could be explained by star spots and rotation. Alternatively it may be a double-lined spectroscopic binary viewed from nearly pole-on.[17]
This star is classified as an α2 Canum Venaticorum type variable star and its brightness varies by 0.03 magnitudes.[5] It has 2.44 times the mass and 2.35 times the radius of the Sun.[8] O. J. Eggen included it as a member of the Hyades Stream.[7]
References
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- ↑ a b c d e Script error: No such module "Citation/CS1".
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- ↑ a b Script error: No such module "citation/CS1".
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- ↑ Template:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Template:ISBN.
- ↑ Template:In lang 香港太空館 - 研究資源 - 亮星中英對照表 Template:Webarchive, Hong Kong Space Museum. Accessed on line November 23, 2010.
- ↑ Script error: No such module "citation/CS1".
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External links
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