Zeta Caeli
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Caelum[1] |
| Right ascension | 04h 47m 49.57719s[2] |
| Declination | −30° 01′ 13.3391″[2] |
| Apparent magnitude (V) | +6.36[3] |
| Characteristics | |
| Spectral type | K0 III[4] |
| B−V color index | +1.06[3] |
| Astrometry | |
| Radial velocity (Rv) | +6.7±1.0[5] km/s |
| Proper motion (μ) | RA: +28.747 mas/yr[2] Dec.: +92.712 mas/yr[2] |
| Parallax (π) | 6.8479±0.0167 mas[2] |
| Distance | 476 ± 1 ly (146.0 ± 0.4 pc) |
| Absolute magnitude (MV) | +0.76[1] |
| Details[2] | |
| Mass | 2.90+0.04 −0.30 M☉ |
| Radius | 12.45±0.25 R☉ |
| Luminosity | 86.67+0.42 −0.44 L☉ |
| Surface gravity (log g) | 2.62±0.01 cgs |
| Temperature | 4,992+6 −5 K |
| Metallicity [Fe/H] | −0.22[6] dex |
| Age | 414+99 −41 Myr |
| Other designations | |
| ζ Cae, CD−30°2011, GC 5851, HD 30608, HIP 22280, HR 1539, SAO 195300[7] | |
| Database references | |
| SIMBAD | data |
Zeta Caeli is an orange-hued star in the southern constellation of Caelum. Its name is a Bayer designation that is Latinized from ζ Caeli, and abbreviated Zeta Cae or ζ Cae. With an apparent visual magnitude of +6.36,[3] it is near the lower limit of brightness for stars visible to the naked eye. Based upon an annual parallax shift of 7.59 mas as seen from Earth,[2] this star is located about 430 light-years (130 pc) away. It is drifting further from the Sun with a line of sight velocity of +7 km/s.[5]
This is an evolved K-type giant star with a stellar classification of K0 III.[4] At an estimated 414 million years of age, this star has 2.9 times the mass of the Sun but it has expanded to 12 times the Sun's radius. It is radiating 87 times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,992 K.[2] This star is a member of the Milky Way's thick disk population.[6]
References
[edit]- ^ a b 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.
- ^ a b c d e f g 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.
- ^ a b c Cousins, A. W. J.; et al. (1966), "Photoelectric magnitudes and colours of southern stars, II", Royal Observatory Bulletins, 121: 1, Bibcode:1966RGOB..121....1C.
- ^ a b Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H.
- ^ a b 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.
- ^ a b Meléndez, J.; et al. (June 2008), "Chemical similarities between Galactic bulge and local thick disk red giant stars", Astronomy and Astrophysics, 484 (3): L21 – L25, arXiv:0804.4124, Bibcode:2008A&A...484L..21M, doi:10.1051/0004-6361:200809398, S2CID 3201679.
- ^ "zet Cae". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-09-09.
