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.[1] 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.[1]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cancer[note 1] |
| Right ascension | 09h 05m 45.5255s[1] |
| Declination | +17° 23′ 24.4645″[1] |
| Apparent magnitude (V) | 8.1[1] |
| Characteristics | |
| Spectral type | A2[1] |
| 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 | 0.749+0.1 −0.102 Myr |
| Other designations | |
| 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]
References
edit- ^ a b c d e f g "71 Cancri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2024-06-19.
- ^ a b c d e f g Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
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