Astronomy:71 Cancri
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[2] mas/yr Dec.: −8.141[2] mas/yr |
| Parallax (π) | 3.6905 ± 0.0292[2] mas |
| Distance | 884 ± 7 ly (271 ± 2 pc) |
| 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 | |
| Database references | |
| SIMBAD | data |
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]
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]
References
- ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R Constellation record for this object at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940 Gaia DR3 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 3.3 "71 Cancri". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=71+Cancri.
Coordinates: 
09h 05m 46s, +17° 23′ 24″
 |  |
