Epsilon1 Arae
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Template:Location mark The location of ε1 Arae (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ara |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | +4.068[2] |
| Characteristics | |
| Spectral type | K3 III[3] |
| U−B Template:Engvar | +1.71[4] |
| B−V Template:Engvar | +1.45[4] |
| Astrometry | |
| Radial velocity (Rv) | +23.85±0.03[5] km/s |
| Proper motion (μ) | RA: +1.015 mas/yr[1] Dec.: +21.455 mas/yr[1] |
| Parallax (π) | 8.8520±0.1517 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −0.79±0.16[6] |
| Details[5] | |
| Mass | 1.63±0.21 Template:Solar mass |
| Radius | 29.52±2.45 Template:Solar radius |
| Luminosity | 347Template:Su Template:Solar luminosity |
| Surface gravity (log g) | 1.85±0.07 cgs |
| Temperature | 4,302±45 K |
| Metallicity [Fe/H] | −0.19±0.06 dex |
| Rotational velocity (v sin i) | 4.20±0.45 km/s |
| Age | 1.82±0.60 Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[7] | |
| Database references | |
| SIMBAD | data |
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Epsilon1 Arae is a star in the southern constellation Ara, the Altar. Its name is a Bayer designation that is Latinized from ε1 Arae, and abbreviated Epsilon1 Ara or ε1 Ara. This star is visible to the naked eye with an apparent visual magnitude of +4.1[2] Based upon an annual parallax shift of Template:Val,[1] this star is approximately Template:Convert distant from the Earth. It is drifting further away with a radial velocity of +24 km/s.[5]
ε1 Arae is an evolved giant star[8] with a stellar classification of K3 III.[3] It is around 63% more massive than the Sun. At an age of about 1.8 billion years, the outer envelope of the star has expanded to almost 30 times the Sun's radius. It is radiating 347 times the luminosity of the Sun from its photosphere at an effective temperature of 4,302 K,[5] giving it the orange-hued glow of a K-type star.[9]
ε1 Arae was known as Script error: No such module "Lang".(spelled as "Guī yī", meaning: "the 1st (star) of Script error: No such module "Lang".") in traditional Chinese astronomy.[10][11] Allen erroneously called it Tso Kang (Script error: No such module "Lang".).[12] He probably confused the constellation "Ara" with "Ari", as Tso Kang is actually in Aries.[10][11]
References
External links
- Simbad Epsilon1 Arae
- Image Epsilon1 Arae
- AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 1 日 Template:WebarchiveTemplate:In lang
- ↑ a b c d e Cite error: Invalid
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<ref>tag; no text was provided for refs namedcsiro - ↑ a b Chevalier, S., and Tsuchihashi, P., (1911): "Catalogue d'Étoiles fixes, observés a Pekin sous l'Empereur Kien Long (Qianlong (Chien-Lung)), XVIIIe siecle", Annales de l'Observatoire Astronomique de Zô-Sé.
- ↑ a b Script error: No such module "Lang". (Yi Shi Tong) (1981): Script error: No such module "Lang"..Template:In lang
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