66 Cancri

66 Cancri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cancer
Right ascension 09h 01m 24.13000s[1]
Declination +32° 15′ 08.2666″[1]
Apparent magnitude (V) 5.870[2] (5.95 + 8.56)[3]
Characteristics
Evolutionary stage main sequence[4]
Spectral type A2 V[2]
B−V color index 0.088±0.007[5]
Astrometry
Radial velocity (Rv)−12.8±2.9[6] km/s
Proper motion (μ) RA: +0.48[7] mas/yr
Dec.: +0.34[7] mas/yr
Parallax (π)6.8850 ± 0.1020 mas[1]
Distance474 ± 7 ly
(145 ± 2 pc)
Absolute magnitude (MV)0.14[5]
Details
Mass2.73±0.11[4] M☉
Luminosity95.7+24.6
−19.5[4] L☉
Surface gravity (log g)4.0[2][4] cgs
Temperature8,974+230
−224[4] K
Rotational velocity (v sin i)183[4] km/s
Age162[2] Myr
Other designations
66 Cnc, BD+32°1829, HD 77104, HIP 44307, HR 3587, SAO 61202, WDS 09014+3215[8]
Database references
SIMBADdata

66 Cancri is a binary star[9] system near the northern border of the zodiac constellation of Cancer, located 474 light years away from the Sun. It is visible to the naked eye as a faint, white-hued star with a combined apparent visual magnitude of 5.87.[2] The pair are moving closer to the Earth with a heliocentric radial velocity of −13 light years.[6] As of 2003, the magnitude 8.56 companion was located at an angular separation of 4.43″ along a position angle of 134° from the primary.[9]

The brighter member of the system, designated component A, is an A-type main-sequence star with a stellar classification of A2 V.[2] It is around 162[2] million years old with a high rate of spin, showing a projected rotational velocity of 183 km/s.[4] Estimates of the mass of the star range from 1.7[10] up to 2.73[4] times the mass of the Sun. It is radiating 96[4] times the Sun's luminosity from its photosphere at an effective temperature of 8,974 K.[4]

  1. ^ a b c Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g Cite error: The named reference gullikson2016 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).
  4. ^ a b c d e f g h i j Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference vanLeeuwen2007 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 Roberts2005 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Gullikson2016 was invoked but never defined (see the help page).