Epsilon Crateris
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Crater[1] |
| Right ascension | 11h 24m 36.591s[2] |
| Declination | −10° 51′ 33.576″[2] |
| Apparent magnitude (V) | 4.81[1] |
| Characteristics | |
| Spectral type | K5 III[3] |
| U−B color index | +1.87[4] |
| B−V color index | +1.556±0.005[1] |
| Astrometry | |
| Radial velocity (Rv) | +2.0±0.6[5] km/s |
| Proper motion (μ) | RA: −25.154 mas/yr[2] Dec.: +24.689 mas/yr[2] |
| Parallax (π) | 8.1780±0.1653 mas[2] |
| Distance | 399 ± 8 ly (122 ± 2 pc) |
| Absolute magnitude (MV) | −0.43±0.18[6] |
| Details | |
| Mass | 0.99±0.08[6] M☉ |
| Radius | 44.7[7] R☉ |
| Luminosity | 391[8] L☉ |
| Surface gravity (log g) | 1.61[9] cgs |
| Temperature | 3,930[9] K |
| Metallicity [Fe/H] | −0.38[9] dex |
| Rotational velocity (v sin i) | 10[10] km/s |
| Other designations | |
| ε Crt, 14 Crateris, BD−10°3260, HD 99167, HIP 55687, HR 4402, SAO 156658[11] | |
| Database references | |
| SIMBAD | data |
Epsilon Crateris is a solitary[12] star in the southern constellation of Crater. Its name is a Bayer designation that is Latinized from ε Crateris and abbreviated ε Crt or ε Crt. Visible to the naked eye, it has an apparent visual magnitude of 4.81.[1] With an annual parallax shift of 8.1780 mas as seen from the Earth, its estimated distance is approximately 399 light-years (122 pc) 376 light years from the Sun.
This is an evolved K-type giant star with a stellar classification of K5 III.[3] It has about the same mass as the Sun, but has expanded to 44.7[7] times the Sun's radius. The star is radiating 391[8] times the solar luminosity from its outer atmosphere at an effective temperature of 3,930 K.[9]
References
- 1 2 3 4 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 XHIP record for this object at VizieR.
- 1 2 3 4 5 Vallenari, A.; et al. (Gaia collaboration) (2023), "Gaia Data Release 3. Summary of the content and survey properties", Astronomy and Astrophysics, 674: A1, arXiv:2208.00211, Bibcode:2023A&A...674A...1G, doi:10.1051/0004-6361/202243940, S2CID 244398875 Gaia DR3 record for this source at VizieR.
- 1 2 Houk, N.; Swift, C. (1999), "Michigan catalogue of two-dimensional spectral types for the HD Stars", Michigan Spectral Survey, 5, Ann Arbor, Michigan: Department of Astronomy, University of Michigan, Bibcode:1999MSS...C05....0H.
- ↑ Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, SIMBAD, Bibcode:1986EgUBV........0M.
- ↑ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
- 1 2 da Silva, L.; et al. (November 2006), "Basic physical parameters of a selected sample of evolved stars", Astronomy and Astrophysics, 458 (2): 609–623, arXiv:astro-ph/0608160, Bibcode:2006A&A...458..609D, doi:10.1051/0004-6361:20065105, S2CID 9341088.
- 1 2 Setiawan, J.; et al. (July 2004), "Precise radial velocity measurements of G and K giants. Multiple systems and variability trend along the Red Giant Branch", Astronomy and Astrophysics, 421: 241–254, Bibcode:2004A&A...421..241S, doi:10.1051/0004-6361:20041042-1.
- 1 2 McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
- 1 2 3 4 McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants", Astrophysical Journal Supplement Series, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527.
- ↑ Bernacca, P. L.; Perinotto, M. (1970), "A catalogue of stellar rotational velocities", Contributi Osservatorio Astronomico di Padova in Asiago, 239 (1): 1, Bibcode:1970CoAsi.239....1B.
- ↑ "* eps Crt -- Star", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2017-03-01.
- ↑ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
