Global InformationEpsilon Equulei information
| 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] |
| Astrometry | |
| Radial velocity (Rv) | 8.20 ± 0.2[6] km/s |
| Proper motion (μ) | RA: -115.75[1] mas/yr Dec.: -151.70[1] mas/yr |
| Parallax (π) | 18.49 ± 1.35 mas[1] |
| Distance | 180 ± 10 ly (54 ± 4 pc) |
| Absolute magnitude (MV) | +1.65[7] |
| Orbit[3] | |
| Period (P) | 101.485 yr |
| Semi-major axis (a) | 0.6474″ |
| Eccentricity (e) | 0.705 |
| Inclination (i) | 92.17° |
| Longitude of the node (Ω) | 105.15° |
| Periastron epoch (T) | 1920.37 |
| Argument of periastron (ω) (secondary) | 340.19° |
| Details | |
| A | |
| Mass | 1.74[8] M☉ |
| Surface gravity (log g) | 3.87[9] cgs |
| Temperature | 6,223[9] K |
| B | |
| Mass | 1.53[8] M☉ |
| Surface gravity (log g) | 4.29[9] cgs |
| Temperature | 6,399[9] K |
| Age | 1.5[10] Gyr |
| Other designations | |
ε Equ, 1 Equulei, HD 199766, HIP 103569, HR 8034, SAO 126428, 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]
- ^ a b c d e f van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
- ^ a b "* eps Equ". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 8 July 2017.
- ^ a b "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 8 July 2017.
- ^ Beavers, W. I.; Cook, D. B. (1980). "Scanner studies of composite spectra. I - Dwarfs". The Astrophysical Journal Supplement Series. 44: 489. Bibcode:1980ApJS...44..489B. doi:10.1086/190702.
- ^ a b Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Catalogue of Eggen's UBV Data: 0. Bibcode:1986EgUBV........0M.
- ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
- ^ Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015, S2CID 119257644.
- ^ a b "Multiple Star Catalog". Archived from the original on 2018-11-29. Retrieved 2018-11-28.
- ^ a b c d Luck, R. Earle (2015). "Abundances in the Local Region. I. G and K Giants". The Astronomical Journal. 150 (3): 88. arXiv:1507.01466. Bibcode:2015AJ....150...88L. doi:10.1088/0004-6256/150/3/88. S2CID 118505114.
- ^ Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey". Astronomy and Astrophysics. 530: A138. arXiv:1103.4651. Bibcode:2011A&A...530A.138C. doi:10.1051/0004-6361/201016276. S2CID 56118016.