Epsilon Arietis
Template:Location mark Location of ε Arietis (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 4.63[2] (5.2/5.5)[3] |
| Characteristics | |
| Spectral type | A2 Vs + A2 Vs[4] |
| U−B Template:Engvar | +0.08[2] |
| B−V Template:Engvar | +0.04[2] |
| R−I Template:Engvar | 0.02Script error: No such module "Unsubst". |
| Astrometry | |
| Radial velocity (Rv) | +0.9±0.9[5] km/s |
| Proper motion (μ) | RA: −15.884 mas/yr[1] Dec.: −7.151 mas/yr[1] |
| Parallax (π) | 9.0296±0.1851 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| 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 | |
| ε Ari A | |
| Mass | 2.4[6] Template:Solar mass |
| Rotational velocity (v sin i) | 60[4] km/s |
| ε Ari B | |
| Mass | 2.4[6] Template:Solar mass |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Rotational velocity (v sin i) | 60[4] km/s |
| Other designations | |
| Template:Odlist[7] | |
| ε Ari A: Template:Odlist | |
| ε Ari B: HD 18519, HR 887 | |
| Database references | |
| SIMBAD | ε Ari |
| ε Ari A | |
| ε Ari B | |
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Epsilon Arietis is a visual binary[8] star system in the northern constellation of Aries. Its name is a Bayer designation that is Latinized from ε Arietis, and abbreviated Epsilon Ari or ε Ari. This system has a combined apparent visual magnitude of 4.63[2] and can be seen with the naked eye, although the two components are too close together to be resolved without a telescope. With an annual parallax shift of Script error: No such module "val".,[9] the distance to this system can be estimated as Script error: No such module "convert"., give or take a 7 light-year margin of error. It is located behind the dark cloud MBM12.[6]
The brighter member of this pair has an apparent magnitude of 5.2.[3] At an angular separation of Script error: No such module "val". from the brighter component, along a position angle of Script error: No such module "val".,[8] is the magnitude 5.5 companion.[3] Both are A-type main sequence stars with a stellar classification of A2 Vs.[4] (The 's' suffix indicates that the absorption lines in the spectrum are distinctly narrow.) In the 2009 Catalogue of Ap, HgMn and Am stars, the two stars have a classification of A3 Ti,[3] indicating they are Ap stars with an anomalous abundance of titanium. Within the measurement margin of error, their projected rotational velocities are deemed identical at 60 km/s.[4]
Name
This star system, along with δ Ari, ζ Ari, π Ari, and ρ3 Ari, were Al Bīrūnī's Al Buṭain (ألبطين), the dual of Al Baṭn, the Belly.[10] According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al Buṭain were the title for five stars :δ Ari as Botein, π Ari as Al Buṭain I, ρ3 Ari as Al Buṭain II, ε Ari as Al Buṭain III and ζ Ari as Al Buṭain IV[11]
In Chinese astronomy, Epsilon Arietis may be or may be part of Tso Kang (from Cantonese Script error: No such module "Lang". zogang, Mandarin pronunciation zuǒgēng).[12][13]
References
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- ↑ a b c d Template:Cite Gaia DR3
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ a b c d e Script error: No such module "citation/CS1".
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- ↑ a b c d Script error: No such module "citation/CS1".
- ↑ Template:Cite simbad
- ↑ a b 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 "citation/CS1".
- ↑ 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.
- ↑ Script error: No such module "Lang". (Yi Shi Tong) (1981): Script error: No such module "Lang"..Template:In lang
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