71 Cancri
A-type star in the constellation Cancer
From Wikipedia, the free encyclopedia
71 Cancri is a star in the constellation Cancer. Its spectral classification A2 indicates that it is an A-type star but the luminosity class is not specified.[3] Parallax measurements imply a distance of 271 parsecs (880 ly), and it is drifting further away at a speed of 28 km/s.[2] Being apparent magnitude 8.1, it is not visible to the naked eye.[3]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cancer[1] |
| Right ascension | 09h 05m 45.5256s[2] |
| Declination | +17° 23′ 24.464″[2] |
| Apparent magnitude (V) | 8.1[3] |
| Characteristics | |
| Evolutionary stage | main sequence[2] |
| Spectral type | A2[3] |
| Astrometry | |
| Radial velocity (Rv) | 28.35±0.38[2] km/s |
| Proper motion (μ) | RA: −28.352 mas/yr[2] Dec.: −8.141 mas/yr[2] |
| Parallax (π) | 3.6905±0.0292 mas[2] |
| Distance | 884 ± 7 ly (271 ± 2 pc)[2] |
| Details[2] | |
| Mass | 2.161+0.044 −0.041 M☉ |
| Radius | 2.96±0.07 R☉ |
| Luminosity | 33.3+0.9 −0.7 L☉ |
| Surface gravity (log g) | 3.777+0.028 −0.044 cgs |
| Temperature | 8051±91 K |
| Age | 749+100 −102 Myr |
| Other designations | |
| 71 Cnc, BD+17 2004, HD 77892, HIP 44637, SAO 98358, TIC 330687375, TYC 1401-1139-1, GSC 01401-01139, 2MASS J09054552+1723244, Gaia DR3 611251121272814464 | |
| Database references | |
| SIMBAD | data |
This A-type star is estimated to be 750 million years old (16% Solar System age). It has a mass roughly 2.2 times the mass of the Sun and an enlarged radius three times that of the Sun. 71 Cancri is 33 times more luminous and 40% hotter, with a surface effective temperature of 8,051 K. Its apparent brightness is diminished by 0.02 magnitudes due to interveining gas and dust between Earth and the star.[2]
