Rho2 Cancri
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 55m 39.680s[1] |
| Declination | +27° 55′ 38.94″[1] |
| Apparent magnitude (V) | 5.22[2] |
| Characteristics | |
| Evolutionary stage | horizontal branch[3] |
| Spectral type | G8 III[4] or G8 II-III[5] |
| U−B color index | +0.78[2] |
| B−V color index | +1.00[2] |
| Astrometry | |
| Radial velocity (Rv) | +16.3±0.3[6] km/s |
| Proper motion (μ) | RA: −13.014 mas/yr[1] Dec.: −32.535 mas/yr[1] |
| Parallax (π) | 5.5719±0.0903 mas[1] |
| Distance | 585 ± 9 ly (179 ± 3 pc) |
| Absolute magnitude (MV) | −1.13[4] |
| Details | |
| Mass | 3.59[7] M☉ |
| Radius | 24.2[4] R☉ |
| Luminosity | 310[4] L☉ |
| Surface gravity (log g) | 2.46[8] cgs |
| Temperature | 4,994[8] K |
| Metallicity [Fe/H] | 0.11[8] dex |
| Rotational velocity (v sin i) | 8.1[4] km/s |
| Age | 234[7] Myr |
| Other designations | |
| ρ2 Cnc, 58 Cancri, BD+28°1666, FK5 2705, GC 12326, HD 76219, HIP 43834, HR 3540, SAO 80511[9] | |
| Database references | |
| SIMBAD | data |
Rho2 Cancri is a solitary,[5] yellow-hued star in the constellation Cancer. Its name is a Bayer designation that is Latinized from ρ2 Cancri, and abbreviated or Rho2 Cnc or ρ2 Cnc. With an apparent visual magnitude of 5.22,[2] it is visible to the naked eye on a dark night. Based upon an annual parallax shift of 6.70 mas as seen from Earth,[1] this star is located approximately 585 light-years (179 pc) from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.06 due to interstellar dust.[7] It is moving further away with a line of sight velocity of +16 km/s.[6]
At the age of about 234[7] million years, is an evolved, G-type giant star with a stellar classification of G8 III.[4] It has an estimated 3.6[7] times the mass of the Sun and has expanded to 24[4] times the Sun's radius. It is radiating 310[4] times the Sun's luminosity from its photosphere at an effective temperature of 4,994 K.[8] The star is spinning with a projected rotational velocity of 8 km/s.[4]
References
[edit]- 1 2 3 4 5 6 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 Fernie, J. D. (May 1983), "New UBVRI photometry for 900 supergiants", Astrophysical Journal Supplement Series, 52: 7–22, Bibcode:1983ApJS...52....7F, doi:10.1086/190856.
- ↑ Stock, S.; et al. (August 2018), "Precise radial velocities of giant stars. X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search", Astronomy & Astrophysics, 616: 15, arXiv:1805.04094, Bibcode:2018A&A...616A..33S, doi:10.1051/0004-6361/201833111, S2CID 119361866, A33.
- 1 2 3 4 5 6 7 8 9 Henry, Gregory W.; et al. (September 2000), "Photometric Variability in a Sample of 187 G and K Giants", The Astrophysical Journal Supplement Series, 130 (1): 201–225, Bibcode:2000ApJS..130..201H, CiteSeerX 10.1.1.40.8526, doi:10.1086/317346, S2CID 17160805.
- 1 2 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.
- 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 5 Takeda, Yoichi; et al. (August 2008), "Stellar Parameters and Elemental Abundances of Late-G Giants", Publications of the Astronomical Society of Japan, 60 (4): 781–802, arXiv:0805.2434, Bibcode:2008PASJ...60..781T, doi:10.1093/pasj/60.4.781.
- 1 2 3 4 Luck, R. Earle (2014), "Parameters and Abundances in Luminous Stars", The Astronomical Journal, 147 (6): 137, Bibcode:2014AJ....147..137L, doi:10.1088/0004-6256/147/6/137.
- ↑ "rho02 Cnc", SIMBAD, Centre de données astronomiques de Strasbourg, retrieved 2017-06-13.
