83 Cancri

83 Cancri
Observation data
Epoch J2000      Equinox J2000
Constellation Cancer
Right ascension 09h 18m 58.82772s[1]
Declination +17° 42′ 19.2744″[1]
Apparent magnitude (V) 6.61[2]
Characteristics
Evolutionary stage main sequence
Spectral type F4V[2] + WD[3]
B−V color index 0.487±0.030[2]
Variable type constant[2]
Astrometry
Radial velocity (Rv)−14.8±0.4[2] km/s
Proper motion (μ) RA: −135.130[1] mas/yr
Dec.: −105.267[1] mas/yr
Parallax (π)24.5641 ± 0.0966 mas[1]
Distance132.8 ± 0.5 ly
(40.7 ± 0.2 pc)
Absolute magnitude (MV)3.57[2]
Orbit[3]
Period (P)32±2.5 d
Eccentricity (e)0.6±0.2
Inclination (i)94±6°
Longitude of the node (Ω)148±5°
Periastron epoch (T)1976.0±3.5
Argument of periastron (ω)
(secondary)		351±42°
Details
83 Cnc A
Mass1.13[4] M☉
Radius1.53+0.02
−0.05[1] R☉
Luminosity3.135±0.015[1] L☉
Surface gravity (log g)3.99[4] cgs
Temperature6,218+96
−53[1] K
Metallicity [Fe/H]−0.26±0.02[2] dex
Age3.1[4] Gyr
83 Cnc B
Mass1.3[3] M☉
Other designations
83 Cnc, BD+18°2165, FK5 350, HD 80218, HIP 45699, SAO 98488[5]
Database references
SIMBADdata

83 Cancri is an astrometric binary[6][7] star system in the northern constellation of Cancer, positioned near the constellation border with Leo. It is a challenge to view with the naked eye, having an apparent visual magnitude of 6.61.[2] Despite having a Flamsteed designation, the system was too faint to be included in the Bright Star Catalogue.[8] It is located at a distance of 133 light years from the Sun, based on parallax,[1] but is drifting closer with a radial velocity of −15 km/s.[2] 83 Cancri has a relatively high proper motion, traversing the celestial sphere at an angular rate of 0.185″ per annum.[9]

The pair have an orbital period of around 32 days and an eccentricity of about 0.6.[3] The visible member of this system, designated component A, is an F-type main-sequence star with a stellar classification of F4V.[2] Its atmosphere is enhanced with s-process elements, particularly strontium and yttrium, which is attributed to mass transfer from the companion while the latter was on the asymptotic giant branch.[10] The primary is 3.1[4] billion years old with 1.1[4] times the mass of the Sun and 1.5[1] times the Sun's radius. It is radiating 3.1[1] times the luminosity of the Sun from its photosphere at an effective temperature of 6,218 K.[1] The unseen secondary companion is most likely a high mass white dwarf, having around 1.3 times the Sun's mass.[3]

  1. ^ a b c d e f g h i j k l Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i j Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference Goncharov2002 was invoked but never defined (see the help page).
  4. ^ a b c d e Cite error: The named reference David2015 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Tokovinin2014 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Bidelman1990 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Lepine2005 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Reddy2003 was invoked but never defined (see the help page).