Omega1 Cancri
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 00m 55.873s[1] |
| Declination | +25° 23′ 34.21″[1] |
| Apparent magnitude (V) | 5.85[2] |
| Characteristics | |
| Spectral type | G8 III[3] |
| U−B color index | +0.88[2] |
| B−V color index | +1.02[2] |
| Astrometry | |
| Radial velocity (Rv) | +1.90[3] km/s |
| Proper motion (μ) | RA: +16.663 mas/yr[1] Dec.: +7.197 mas/yr[1] |
| Parallax (π) | 5.3076±0.0367 mas[1] |
| Distance | 615 ± 4 ly (188 ± 1 pc) |
| Absolute magnitude (MV) | −2.27[4] |
| Details | |
| Mass | 3.70+0.04 −1.11[1] M☉ |
| Radius | 17.09+0.17 −0.09[1] R☉ |
| Luminosity | 165.1±2.2[1] L☉ |
| Surface gravity (log g) | 2.461+0.005 −0.008[1] cgs |
| Temperature | 4,941+4 −11[1] K |
| Metallicity [Fe/H] | +0.15±0.19[5] dex |
| Age | 217+344 −17[1] Myr |
| Other designations | |
| ω1 Cnc, 2 Cancri, BD+25°1812, FK5 1211, GC 10844, HD 65714, HIP 39191, HR 3124, SAO 79861[6] | |
| Database references | |
| SIMBAD | data |
Omega1 Cancri is a yellow-hued star in the zodiac constellation of Cancer. Its name is a Bayer designation that is Latinized from ω1 Cancri, and abbreviated Omega1 Cnc or ω1 Cancri. This is a faint star near the lower limit of visibility to the naked eye, having an apparent visual magnitude of 5.85.[2] Based upon an annual parallax shift of 5.31 mas as seen from Earth,[1] this system is 615 light-years (188 pc) away from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.10 due to interstellar dust.[5] It is receding from the Sun with a radial velocity of +2 km/s.[3]
At an estimated age of 217 million years,[1] this is an evolved G-type giant with a stellar classification of G8 III.[3] With the supply of hydrogen at its core exhausted, the star has cooled and expanded to 17 times the girth of the Sun. It has 3.7 times the mass of the Sun and is radiating 165 times the solar luminosity from its photosphere at an effective temperature of 4,941 K.[1] The surface metallicity of this star – what astronomers term the abundance of elements other than hydrogen and helium – is 41% higher than in the Sun.[5]
References
[edit]- ^ a b c d e f g h i j k l m 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 d Walker, R. L. Jr. (April 1971), "UBV Photometry of 173 PZT Stars", Publications of the Astronomical Society of the Pacific, 83 (492): 177, Bibcode:1971PASP...83..177W, doi:10.1086/129097.
- ^ a b c d Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
- ^ Schiavon, Ricardo P. (July 2007), "Population Synthesis in the Blue. IV. Accurate Model Predictions for Lick Indices and UBV Colors in Single Stellar Populations", The Astrophysical Journal Supplement Series, 171 (1): 146–205, arXiv:astro-ph/0611464, Bibcode:2007ApJS..171..146S, doi:10.1086/511753, S2CID 13946698.
- ^ a b c Koleva, M.; Vazdekis, A. (February 2012), "Stellar population models in the UV. I. Characterisation of the New Generation Stellar Library", Astronomy & Astrophysics, 538: 13, arXiv:1111.5449, Bibcode:2012A&A...538A.143K, doi:10.1051/0004-6361/201118065, S2CID 53999614, A143.
- ^ "ome Cnc", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2017-06-07.
