Eta Crateris
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Crater[1] |
| Right ascension | 11h 56m 00.954s[2] |
| Declination | −17° 09′ 02.968″[2] |
| Apparent magnitude (V) | 5.17[1] |
| Characteristics | |
| Spectral type | A0 V[3] |
| U−B color index | −0.06[4] |
| B−V color index | −0.022±0.002[1] |
| Variable type | constant[1] |
| Astrometry | |
| Radial velocity (Rv) | +15.0±4.2[5] km/s |
| Proper motion (μ) | RA: −49.952 mas/yr[2] Dec.: −8.271 mas/yr[2] |
| Parallax (π) | 13.0075±0.1226 mas[2] |
| Distance | 251 ± 2 ly (76.9 ± 0.7 pc) |
| Absolute magnitude (MV) | +1.00[6] |
| Details | |
| Mass | 2.55±0.02[7] M☉ |
| Radius | 2.47[8] R☉ |
| Luminosity | 57±2[7] L☉ |
| Temperature | 9,930±90[7] K |
| Rotational velocity (v sin i) | 65[3] km/s |
| Age | 350[6] Myr |
| Other designations | |
| η Crt, 30 Crateris, BD−16°3358, FK5 1309, HD 103632, HIP 58188, HR 4567, SAO 156988[9] | |
| Database references | |
| SIMBAD | data |
Eta Crateris is a solitary[10] star in the southern constellation of Crater. Its name is a Bayer designation that is Latinized from η Crateris and abbreviated Eta Crt or η Crt. This star marks the lip of the tilted bowl on the left side in the constellation. Eta Crateris lies in the sky NE of Zeta Crateris and NNW of 31 Crateris, the three stars forming an almost perfect right triangle with Eta at the right angle and 31 and Zeta the ends of the hypotenuse. Eta Crateris also lies to the right (west) of the bright star Gamma Corvi.
This star is faintly visible to the naked eye with an apparent visual magnitude of 5.17.[4] With an annual parallax shift of 13.01 mas as seen from Earth, it is located around 251 light-years (77 pc) from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.08 due to interstellar dust.[6] The star is receding from the Sun with a radial velocity of +15 km/s.[5]
Eta Crateris is an ordinary A-type main sequence star with a stellar classification of A0 V.[3] It has 2.55 times the mass[7] and 2.47 times the radius of the Sun.[8] It radiates 57 times the solar luminosity from its outer atmosphere at an effective temperature of 9,930 K.[7] It is 350 million years old[6] and is spinning with a projected rotational velocity of 65 km/s.[3]
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 3 4 Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298.
- 1 2 Mermilliod, J.-C. (1986), Compilation of Eggen's UBV data, transformed to UBV (unpublished), SIMBAD, Bibcode:1986EgUBV........0M.
- 1 2 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 3 4 Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters, 38 (11): 694–706, arXiv:1606.09028, Bibcode:2012AstL...38..694G, doi:10.1134/S1063773712110035, S2CID 119108982.
- 1 2 3 4 5 Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, ISSN 0004-6361.
- 1 2 McDonald, I.; et al. (October 2017), "Fundamental parameters and infrared excesses of Tycho-Gaia stars", Monthly Notices of the Royal Astronomical Society, 471: 770–791, arXiv:1706.02208, Bibcode:2017MNRAS.471..770M, doi:10.1093/mnras/stx1433, ISSN 0035-8711. Eta Crateris' database entry at VizieR.
- ↑ "eta Crt", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2017-02-26
- ↑ 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.
