Eta Capricorni
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Capricornus |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | +4.84[2] (5.02 + 7.39)[3] |
| Characteristics | |
| Spectral type | A4 V + F2 V[4] |
| U−B Template:Engvar | +0.09[2] |
| B−V Template:Engvar | +0.17[2] |
| Astrometry | |
| Proper motion (μ) | RA: Script error: No such module "val".[1] mas/yr Dec.: Script error: No such module "val".[1] mas/yr |
| Parallax (π) | 20.20±0.82 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +1.35[5] |
| Orbit[6] | |
| Period (P) | Script error: No such module "val". yr |
| Semi-major axis (a) | Script error: No such module "val".″ |
| Eccentricity (e) | Script error: No such module "val". |
| Inclination (i) | Script error: No such module "val".° |
| Longitude of the node (Ω) | Script error: No such module "val".° |
| Periastron epoch (T) | Script error: No such module "val". |
| Argument of periastron (ω) (secondary) | Script error: No such module "val".° |
| Details | |
| η Cap A | |
| Mass | Script error: No such module "val".[6] Template:Solar mass |
| Luminosity | 24[5] Template:Solar luminosity |
| Metallicity [Fe/H] | −0.01[5] dex |
| η Cap B | |
| Mass | Script error: No such module "val".[6] Template:Solar mass |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| η Cap, 22 Cap, BD−20°6115, HD 200499, HIP 104019, HR 8060, SAO 189986, WDS J21044-1951AB[7] | |
| Database references | |
| SIMBAD | data |
Script error: No such module "Check for unknown parameters".
Eta Capricorni, Latinized from η Capricorni, is a binary star[6] system in the southern constellation of Capricornus. It can be seen with the naked eye, having a combined apparent visual magnitude of +4.84.[2] Based upon an annual parallax shift of 20.20 mas as seen from the Earth,[1] the star is located about 161 light years from the Sun.
The pair orbit each other with a period of 27.85 years, a semimajor axis of 0.265 arc seconds, an eccentricity of 0.410.[6] The primary member, component A, is a white-hued A-type main sequence star with an apparent magnitude of +5.02.[3] Its companion, component B, has an apparent magnitude of +7.39.[3]
Nomenclature
η Capricorni (Latinised to Eta Capricorni) is the system's Bayer designation. It also has the Flamsteed designation 22 Capricorni.
In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Twelve States, refers to an asterism which is represent twelve ancient states in the Spring and Autumn period and the Warring States period, consisting of η Capricorni, φ Capricorni, ι Capricorni, 38 Capricorni, 35 Capricorni, 36 Capricorni, χ Capricorni, θ Capricorni, 30 Capricorni, 33 Capricorni, ζ Capricorni, 19 Capricorni, 26 Capricorni, 27 Capricorni, 20 Capricorni and 21 Capricorni.[8] Consequently, the Chinese name for η Capricorni itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx), meaning that this star (together with 21 Capricorni and β Serpentis in Right Wall of Heavenly Market Enclosure (asterism)[9]) represent Zhou (Script error: No such module "Lang".) (possibly Chow, the dynasty in China).[10]
Sometimes, this star is called by the name Armus in an astrological context.[11]
References
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- ↑ a b c d e f Script error: No such module "citation/CS1".
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ a b c d e Script error: No such module "citation/CS1".
- ↑ Template:Cite simbad
- ↑ 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.
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
Script error: No such module "Check for unknown parameters".