42 Cancri

42 Cancri
Observation data
Epoch J2000      Equinox J2000
Constellation Cancer
Right ascension 08h 40m 43.20572s[1]
Declination +19° 43′ 09.5359″[1]
Apparent magnitude (V) 6.83[2]
Characteristics
Spectral type A7III[3]
B−V color index 0.202±0.004[2]
Astrometry
Radial velocity (Rv)+34.6±0.9[2] km/s
Proper motion (μ) RA: −36.167±0.102[1] mas/yr
Dec.: −12.105±0.063[1] mas/yr
Parallax (π)5.2981 ± 0.0548 mas[1]
Distance616 ± 6 ly
(189 ± 2 pc)
Absolute magnitude (MV)0.56[2]
Details
Mass2.39±0.03[4] M☉
Radius4.22±0.27[4] R☉
Luminosity51.5±0.7[1] L☉
Temperature7,607+258
−313[1] K
Metallicity [Fe/H]−0.08±0.03[4] dex
Rotational velocity (v sin i)195[5] km/s
Age603±28[4] Myr
Other designations
42 Cnc, BD+20° 2172, GC 11916, HD 73785, HIP 42578, SAO 98030, PPM 125583[6]
Database references
SIMBADdata

42 Cancri is a single[7] star in the northern zodiac constellation of Cancer. With an apparent visual magnitude of 6.83,[2] it is dimmer than what is considered the normal lower limit for visibility with the naked eye. The star is located at a distance of approximately 616 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +35 km/s.[2] 42 Cancri is a member of the Beehive Cluster (NGC 2632).[7]

The stellar classification of this star is A7III,[3] matching an A-type star that is in the giant stage. However, this may be a misclassification of a main sequence star.[8] It has also been classified as a spectroscopic binary,[5] although no orbital elements are published. 42 Cancri is an estimated 603[4] million years old and is spinning rapidly with a projected rotational velocity of 195 km/s.[5] The star has 2.39 times the mass of the Sun and 4.2 times the Sun's radius.[4] It is radiating 51.5[1] times the luminosity of the Sun from its photosphere at an effective temperature of 7,607 K.[1]

  1. ^ a b c d e f g h i Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Gray2001 was invoked but never defined (see the help page).
  4. ^ a b c d e f Cite error: The named reference Bochanski2018 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Treanor1960 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Mason1993 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Clampitt1997 was invoked but never defined (see the help page).