Epsilon Equulei
| Observation data Epoch J2000 Equinox J2000 | ||
|---|---|---|
| Constellation | Equuleus | |
| Right ascension | 20h 59m 04.47539s[1] | |
| Declination | +04° 17′ 36.5211″[1] | |
| Apparent magnitude (V) | 5.23[2] (5.96 / 6.31)[3] | |
| Characteristics | ||
| Spectral type | F5(V) + F6(V)[4] | |
| U−B color index | +0.00[5] | |
| B−V color index | +0.47[5] | |
| Absolute magnitude (MV) | +1.65[7] | |
Argument of periastron (ω)(secondary) | 340.19° | |
| Details | ||
| A | ||
Gyr | ||
BD +03°4473 | ||
| Database references | ||
| SIMBAD | data | |
Epsilon Equulei, Latinized from ε Equulei, is a star system of apparent magnitude +5.23[2] in the constellation of Equuleus. It is located 180 light years away from the Solar System, based on its parallax.[1]
Star system
Two stars make up the brighter part of the Epsilon Equulei star system. They are called Epsilon Equulei A and B and are
spectroscopic binary. The orbital period of the latter would be 2.03133 days.[11]
Approximately 10 arcseconds away from A and B is Epsilon Equulei C (HIP 103571), with an apparent magnitude of 7.35. It is another F-type main-sequence stars, and based on its similar distance and proper motion to A and B, it is assumed to be associated.[12]
The Epsilon Equulei system is thought to be approximately 1.5 billion years old.[13]
References
- ^ S2CID 18759600.
- ^ a b "* eps Equ". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 8 July 2017.
- ^ a b c "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 8 July 2017.
- ^ doi:10.1086/190702.
- ^ Bibcode:1986EgUBV........0M.
- S2CID 119231169.
- S2CID 119257644.
- ^ a b "Multiple Star Catalog". Archived from the original on 2018-11-29. Retrieved 2018-11-28.
- ^ S2CID 118505114.
- S2CID 56118016.
- doi:10.1086/190363.
- ^ "* eps Equ C". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 31 July 2017.
- S2CID 56118016.
