Mu2 Cancri
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 07m 45.856s |
| Declination | +21° 34′ 54.53″ |
| Apparent magnitude (V) | +5.30 |
| Characteristics | |
| Evolutionary stage | Subgiant |
| Spectral type | G2 IV |
| U−B color index | +0.21 |
| B−V color index | +0.63 |
| Astrometry | |
| Radial velocity (Rv) | −36.0±0.1 km/s |
| Proper motion (μ) | RA: +23.227 mas/yr Dec.: −67.764 mas/yr |
| Parallax (π) | 41.9916±0.0841 mas |
| Distance | 77.7 ± 0.2 ly (23.81 ± 0.05 pc) |
| Absolute magnitude (MV) | +3.46 |
| Details | |
| Mass | 1.192+0.017 −0.016 M☉ |
| Radius | 1.830±0.037 R☉ |
| Luminosity | 3.645±0.017 L☉ |
| Surface gravity (log g) | 3.97±0.02 cgs |
| Temperature | 5,809±59 K |
| Metallicity [Fe/H] | 0.11 dex |
| Rotational velocity (v sin i) | 3.7±0.3 km/s |
| Age | 5.64+0.35 −0.14 Gyr |
| Other designations | |
| μ2 Cnc, 10 Cancri, BD+22°1862, FK5 2630, GC 11021, HD 67228, HIP 39780, HR 3176, SAO 79959 | |
| Database references | |
| SIMBAD | data |
Mu2 Cancri is a solitary, yellow-hued star in the zodiac constellation of Cancer. Its name is a Bayer designation that is Latinized from μ2 Cancri, and abbreviated Mu2 Cnc or μ2 Cnc. This star is visible to the naked eye with an apparent visual magnitude of +5.30. Based upon an annual parallax shift of 42.36 mas as seen from Earth, this star is located 77.7 light-years (23.8 pc) away from the Sun. It is drifting closer with a radial velocity of −36 km/s and will make its closest approach in about 611,100 years when it passes at a distance of 16.8 light-years (5.2 parsecs).
At the estimated age of 5.6 billion years, Mu2 Cancri is an evolving G-type subgiant star with a stellar classification of G2 IV. It has 1.2 times the mass of the Sun and 1.8 times the Sun's radius. Mu2 Cancri has relatively high metallicity—what astronomers term the abundance of elements other than hydrogen and helium—having a 29% higher abundance compared to the Sun. It is radiating 3.65 times the Sun's luminosity at an effective temperature of 5,809 K. The star is spinning with a leisurely projected rotational velocity of 3.7 km/s.