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71 Cancri

71 Cancri
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]
Distance884 ± 7 ly
(271 ± 2 pc)[2]
Details[2]
Mass2.161+0.044
−0.041 M☉
Radius2.96±0.07 R☉
Luminosity33.3+0.9
−0.7 L☉
Surface gravity (log g)3.777+0.028
−0.044 cgs
Temperature8051±91 K
Age0.749+0.1
−0.102 Myr
Other designations
71 Cnc, BD+17 2004, Gaia DR3 611251121272814464, HD 77892, HIP 44637, SAO 98358, TIC 330687375, TYC 1401-1139-1, GSC 01401-01139, 2MASS J09054552+1723244
Database references
SIMBADdata

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]

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

  1. ^ a b c d e f g "71 Cancri". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2024-06-19.
  2. ^ 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.
  1. ^ Obtained with a right ascension of 09h 05m 45.5255s and a declination of +17° 23′ 24.4645″[1] on this website.
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