Rho2 Cancri
Star in the constellation Cancer
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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]
| 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 |
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]