| Observation data EpochJ2000 EquinoxJ2000 | |
|---|---|
| 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−Vcolor 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] |
| Distance | 132.8 ± 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° |
| Periastronepoch (T) | 1976.0±3.5 |
| Argument of periastron (ω) (secondary) | 351±42° |
| Details | |
| 83 Cnc A | |
| Mass | 1.13[4] M☉ |
| Radius | 1.53+0.02 −0.05[1] R☉ |
| Luminosity | 3.135±0.015[1] L☉ |
| Surface gravity (log g) | 3.99[4] cgs |
| Temperature | 6,218+96 −53[1] K |
| Metallicity [Fe/H] | −0.26±0.02[2] dex |
| Age | 3.1[4] Gyr |
| 83 Cnc B | |
| Mass | 1.3[3] M☉ |
| Other designations | |
| 83 Cnc,BD+18°2165,FK5 350,HD 80218,HIP 45699,SAO 98488[5] | |
| Database references | |
| SIMBAD | data |
83 Cancri is anastrometric binary[6][7]star system in the northernconstellation ofCancer, positioned near the constellation border withLeo. It is a challenge to view with the naked eye, having anapparent visual magnitude of 6.61.[2] Despite having aFlamsteed designation, the system was too faint to be included in theBright Star Catalogue.[8] It is located at a distance of 133 light years from the Sun, based onparallax,[1] but is drifting closer with aradial velocity of −15 km/s.[2] 83 Cancri has a relatively highproper motion, traversing thecelestial sphere at anangular rate of0.185″ per annum.[9]
The pair have anorbital period of around 32 days and aneccentricity of about 0.6.[3] The visible member of this system, designated component A, is anF-type main-sequence star with astellar classification of F4V.[2] Itsatmosphere is enhanced withs-process elements, particularlystrontium andyttrium, which is attributed to mass transfer from the companion while the latter was on theasymptotic giant branch.[10] The primary is 3.1[4] billion years old with 1.1[4] times themass of the Sun and 1.5[1] times theSun's radius. It is radiating 3.1[1] times theluminosity of the Sun from itsphotosphere at aneffective temperature of 6,218 K.[1] The unseen secondary companion is most likely a high masswhite dwarf, having around 1.3 times the Sun's mass.[3]
