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: −46.80[1] mas/yr
Dec.: −48.65[1] mas/yr
Parallax (π)11.23 ± 0.97 mas[1]
Distance290 ± 30 ly
(89 ± 8 pc)
Absolute magnitude (MV)−1.218[6]
Details
Mass1.7±0.1[7] M☉
Radius51.7±1[8] R☉
Luminosity677±41[8] L☉
Surface gravity (log g)1.28±0.04[7] cgs
Temperature4,094±53[8] K
Metallicity [Fe/H]−0.29±0.06[7] dex
Rotational velocity (v sin i)3.7±0.8[7] km/s
Age1.85±0.34[7] 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.[9]
Database references
SIMBADdata

Beta Cancri (β Cancri, abbreviated Beta Cnc, β Cnc), also named Tarf /ˈtɑːrf/,[10] 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.[6] Based on parallax measurements obtained during the Hipparcos mission, it is approximately 290 light-years distant from the Sun.[1] An exoplanet, designated Beta Cancri b, is believed to be orbiting the star.[7]

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.[9] The companion is designated WDS J08165+0911B.[11]

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  6. ^ a b Cite error: The named reference cassatella was invoked but never defined (see the help page).
  7. ^ a b c d e f Cite error: The named reference Lee2014 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference baines2018 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference IAU-LSN was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBADB was invoked but never defined (see the help page).