Epsilon Arietis
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aries |
| Right ascension | 02h 59m 12.6s |
| Declination | +21° 20′ 23″ |
| Apparent magnitude (V) | 4.63 |
| Characteristics | |
| Spectral type | A2Vs |
| U−B color index | 0.08 |
| B−V color index | 0.04 |
| R−I color index | 0.02 |
| Astrometry | |
| Radial velocity (Rv) | -6 km/s |
| Proper motion (μ) | RA: -13.04 mas/yr Dec.: -6.55 mas/yr |
| Parallax (π) | -1 ± 5 mas |
| Distance | approx. 0 ly (approx. −1,000 pc) |
| Absolute magnitude (MV) | 4.67 |
| Details | |
| Mass | 3.1 M☉ |
| Radius | 2.1 R☉ |
| Luminosity | 40 L☉ |
| Temperature | 7,500–10,000 K |
| Rotation | 66 Km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
|
Epsilon Arietis (ε Ari, ε Arietis) is a double star[1] in the constellation Aries. It is approximately 293 light years from Earth.[1]
The two components are both white A-type main sequence dwarfs with apparent magnitudes of 5.2 and 5.5 respectively.[2] They are separated by 1.5 arcseconds on the sky.[2] The combined apparent magnitude of the system is +4.63.
[edit] Name
This star, 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.[3] 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 dan ζ Ari as Al Buṭain IV[4]
[edit] References
- ^ a b eSky: the electronic sky
- ^ a b Clear Skies On Demand - an astronomy blog
- ^ Allen, R. H. (1963). Star Names: Their Lore and Meaning (Reprint ed.). New York, NY: Dover Publications Inc. p. 83. ISBN 0486210790. http://penelope.uchicago.edu/Thayer/E/Gazetteer/Topics/astronomy/_Texts/secondary/ALLSTA/Aries*.html. Retrieved 2010-12-12.
- ^ Jack W. Rhoads - Technical Memorandum 33-507-A Reduced Star Catalog Containing 537 Named Stars, Jet Propulsion Laboratory, California Institute of Technology; November 15, 1971
[edit] External links
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