Mu2 Cancri
Star in the constellation Cancer
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Mu2 Cancri is a solitary,[9] 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.[2] Based upon an annual parallax shift of 42.36 mas as seen from Earth,[1] 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[5] 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).[10]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 07m 45.856s[1] |
| Declination | +21° 34′ 54.53″[1] |
| Apparent magnitude (V) | +5.30[2] |
| Characteristics | |
| Evolutionary stage | Subgiant[3][1] |
| Spectral type | G2 IV[4] |
| U−B color index | +0.21[2] |
| B−V color index | +0.63[2] |
| Astrometry | |
| Radial velocity (Rv) | −36.0±0.1[5] km/s |
| Proper motion (μ) | RA: +23.227 mas/yr[1] Dec.: −67.764 mas/yr[1] |
| Parallax (π) | 41.9916±0.0841 mas[1] |
| Distance | 77.7 ± 0.2 ly (23.81 ± 0.05 pc) |
| Absolute magnitude (MV) | +3.46[6] |
| Details | |
| Mass | 1.192+0.017 −0.016[7] M☉ |
| Radius | 1.830±0.037[1] R☉ |
| Luminosity | 3.645±0.017[1] L☉ |
| Surface gravity (log g) | 3.97±0.02[7] cgs |
| Temperature | 5,809±59[7] K |
| Metallicity [Fe/H] | 0.11[7] dex |
| Rotational velocity (v sin i) | 3.7±0.3[6] km/s |
| Age | 5.64+0.35 −0.14[7] Gyr |
| Other designations | |
| μ2 Cnc, 10 Cancri, BD+22°1862, FK5 2630, GC 11021, HD 67228, HIP 39780, HR 3176, SAO 79959[8] | |
| Database references | |
| SIMBAD | data |
At the estimated age of 5.6 billion years,[7] Mu2 Cancri is an evolving G-type subgiant star[3] with a stellar classification of G2 IV.[4] It has 1.2[7] times the mass of the Sun and 1.8[1] 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.[7] It is radiating 3.65[1] times the Sun's luminosity at an effective temperature of 5,809 K.[7] The star is spinning with a leisurely projected rotational velocity of 3.7 km/s.[6]