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67 Cancri

67 Cancri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cancer
Right ascension 09h 01m 48.83393s[1]
Declination +27° 54′ 09.3505″[1]
Apparent magnitude (V) 6.07[2] (6.08 + 9.22)[3]
Characteristics
Evolutionary stage main sequence
Spectral type A8 Vn[4]
B−V color index 0.243±0.008[2]
Astrometry
Radial velocity (Rv)+12.0±4.3[5] km/s
Proper motion (μ) RA: −57.037[1] mas/yr
Dec.: −80.127[1] mas/yr
Parallax (π)16.7647 ± 0.1550 mas[1]
Distance195 ± 2 ly
(59.6 ± 0.6 pc)
Absolute magnitude (MV)2.25[2]
Details
67 Cnc A
Mass1.89[6] M☉
Radius1.90+0.07
−0.14[1] R☉
Luminosity10.465+0.111
−0.112[1] L☉
Surface gravity (log g)4.35[6] cgs
Temperature7,982±271[6] K
Rotational velocity (v sin i)105[7] km/s
Age867[6] Myr
Other designations
67 Cnc, BD+28°1674, HD 77190, HIP 44342, HR 3589, SAO 80585, WDS 09014+3215[8]
Database references
SIMBADdata

67 Cancri is a wide binary star[9] system in the zodiac constellation of Cancer, located 195[1] light years away from the Sun. It is just visible to the naked eye as a faint, white-hued star with a combined apparent magnitude of 6.07.[2] The binary nature of this system was discovered by James South and John Herschel.[3] As of 2007, the two components have an angular separation of 103.9″, corresponding to a projected separation of 6,100 AU.[9] They are moving further from the Earth with a heliocentric radial velocity of +12 km/s.[5]

The primary, designated component A, is an A-type main-sequence star with a stellar classification of A8 Vn.[4] The 'n' notation indicates "nebulous" lines due to rapid rotation. It is a shell star,[10] with weak shell lines of singly-ionized titanium being detected in the near ultraviolet in 1970. These may have come from a sporadic mass loss event.[11] Uesugi and Fukuda (1970) gave a projected rotational velocity estimate of 105[7] km/s for the star, although Abt et al. (1997) suggested it could be as high as 205 km/s.[11]

67 Cancri A is about 867[6] million years old with 1.89[6] times the mass of the Sun and 1.90[1] times the Sun's radius. It is radiating 10.5[1] times the Sun's luminosity from its photosphere at an effective temperature of 7,982 K.[6]

  1. ^ a b c d e f g h i j Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Cowley1969 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  6. ^ a b c d e f g Cite error: The named reference David2015 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference uesugi_fukuda70 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Trilling2007 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference hauck2000 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference Abt1997 was invoked but never defined (see the help page).

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