| Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 55m 39.68055s [1] |
| Declination | +27° 55′ 38.9299″ [1] |
| Apparent magnitude (V) | 5.22 [2] |
| Characteristics | |
| Spectral type | G8 III [3] or G8 II-III [4] |
| U−B color index | +0.78 [2] |
| B−V color index | +1.00 [2] |
| Astrometry | |
| Radial velocity (Rv) | +16.3±0.3 [5] km/s |
| Proper motion (μ) |
RA: −12.24
[1]
mas/
yr Dec.: −33.79 [1] mas/ yr |
| Parallax (π) | 6.70 ± 0.32 mas [1] |
| Distance | 490 ± 20
ly (149 ± 7 pc) |
| Absolute magnitude (MV) | −1.13 [3] |
| Details | |
| Mass | 3.59 [6] M☉ |
| Radius | 24.2 [3] R☉ |
| Luminosity | 310 [3] L☉ |
| Surface gravity (log g) | 2.46 [7] cgs |
| Temperature | 4,994 [7] K |
| Metallicity [Fe/H] | 0.11 [7] dex |
| Rotational velocity (v sin i) | 8.1 [3] km/s |
| Age | 234 [6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Rho2 Cancri (ρ2 Cancri) is a solitary, [4] yellow-hued star in the constellation Cancer. 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 around 490 light-years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.06 due to interstellar dust. [6]
At the age of about 234 [6] million years, is an evolved, G-type giant star with a stellar classification of G8 III. [3] It has an estimated 3.6 [6] times the mass of the Sun and has expanded to 24 [3] times the Sun's radius. It is radiating 310 [3] times the Sun's luminosity from its photosphere at an effective temperature of 4,994 K. [7]
References
- ^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics, 474 (2): 653–664, arXiv: 0708.1752, Bibcode: 2007A&A...474..653V, doi: 10.1051/0004-6361:20078357, S2CID 18759600.
- ^ a b c d 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.
- ^ a b c d e f g h 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
- ^ a b 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.
- ^ 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 c d e 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.
- ^ a b c d 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.
