Beta Cancri

β Cancri
β Cancri is the bottom right star in the "crab"
Observation data
Epoch J2000      Equinox J2000
Constellation Cancer
Right ascension 08h 16m 30.9206s[1]
Declination +09° 11′ 07.961″[1]
Apparent magnitude (V) 3.50 - 3.58[2]
Characteristics
Spectral type K4III Ba1[3]
U−B color index +1.77[4]
B−V color index +1.48[4]
Variable type Suspected[2]
Astrometry
Radial velocity (Rv)22.94[5] km/s
Proper motion (μ) RA: −45.679 mas/yr[6]
Dec.: −49.505 mas/yr[6]
Parallax (π)10.1026 ± 0.3141 mas[6]
Distance323+10
−8.5 ly
(99.2+3
−2.6 pc)[7]
Absolute magnitude (MV)−1.218[8]
Details
Mass1.75±0.11[9] M☉
Radius51.7±1[9] R☉
Luminosity677±41[9] L☉
Surface gravity (log g)1.9[9] cgs
Temperature4,094±53[9] K
Metallicity [Fe/H]−0.29±0.06[10] dex
Rotational velocity (v sin i)3.7±0.8[10] km/s
Age1.49±0.22[9] Gyr
Other designations
Tarf, β Cancri, 17 Cancri, HR 3249, HD 69267, BD+09°1917, FK5 312, HIP 40526, SAO 116569, GC 11254, ADS 6704, CCDM 08165+0911, WDS J08165+0911A.[11]
Database references
SIMBADdata

Beta Cancri (β Cancri, abbreviated Beta Cnc, β Cnc), also named Tarf /ˈtɑːrf/,[12] is the brightest star in the zodiacal constellation of Cancer. It has an apparent visual magnitude of +3.5[2] and an absolute magnitude of −1.2.[8] Based on parallax measurements obtained by the Gaia spacecraft, it is approximately 323 light-years distant from the Sun.[6] An exoplanet, designated Beta Cancri b, is believed to be orbiting the star.[10]

Beta Cancri has a companion listed and together they are designated WDS J08165+0911. As the primary, Beta Cancri bears the designation WDS J08165+0911A.[11] The companion is designated WDS J08165+0911B.[13]

  1. ^ a b Cite error: The named reference hipparcos was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference gcvs was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference lu was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference eggen was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference famaey was invoked but never defined (see the help page).
  6. ^ a b c 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.
  7. ^ Cite error: The named reference b-j was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference cassatella was invoked but never defined (see the help page).
  9. ^ a b c d e f Cite error: The named reference baines2018 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference Lee2014 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference IAU-LSN was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference SIMBADB was invoked but never defined (see the help page).