37 Cancri
Star in the constellation Cancer
From Wikipedia, the free encyclopedia
37 Cancri is a star in the zodiac constellation of Cancer. It is a challenge to view with the naked eye, having an apparent magnitude of 6.54.[2] The star is moving away from the Earth with a heliocentric radial velocity of +22 km/s, having come as close as 246 light-years some 2.7 million years ago.[6]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 38m 05.17248s[1] |
| Declination | +09° 34′ 28.6006″[1] |
| Apparent magnitude (V) | 6.542[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | A1 V[4][5] |
| B−V color index | −0.010±0.006[6] |
| Astrometry | |
| Radial velocity (Rv) | +22.1±2.2[6] km/s |
| Proper motion (μ) | RA: −28.271[1] mas/yr Dec.: −4.237[1] mas/yr |
| Parallax (π) | 6.5093±0.0735 mas[1] |
| Distance | 501 ± 6 ly (154 ± 2 pc) |
| Absolute magnitude (MV) | 1.30[6] |
| Details | |
| Mass | 2.66±0.05[3] M☉ |
| Radius | 1.8[7] R☉ |
| Luminosity | 30.9+3.0 −2.7[2] L☉ |
| Surface gravity (log g) | 4.30[2] cgs |
| Temperature | 9,830[2] K |
| Metallicity [Fe/H] | −0.21±0.13[2] dex |
| Rotational velocity (v sin i) | 35.2±1.1[2] km/s |
| Other designations | |
| 37 Cnc, BD+10°1840, HD 73316, HIP 42353, HR 3412, SAO 116975[5] | |
| Database references | |
| SIMBAD | data |
This is an ordinary A-type main-sequence star with a stellar classification of A1 V,[4] which indicates it is generating energy through hydrogen fusion at its core. It is spinning with a projected rotational velocity of 35 km/s.[2] The star has 2.7[3] times the mass of the Sun and around 1.8[7] times the Sun's radius. It is radiating 31 times the luminosity of the Sun from its photosphere at an effective temperature of 9,830 K.[2]