13 Cancri
Star in the constellation Cancer
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13 Cancri is a star in the zodiacal constellation of Cancer. Its name is a Flamsteed designation, abbreviated 13 Cnc; it has the Bayer designation ψ1 Cancri, although this is rarely used.[6] This is one of the few Bayer or Flamsteed designated stars that are not listed in the Bright Star Catalogue.[7][8] It is near the lower limit of stellar brightness that is still visible to the naked eye, having an apparent visual magnitude of +6.41.[3] Based on a parallax measurements, it is located at a distance of 962 light-years (295 pc) from the Earth. The star is drifting further away with a line of sight velocity of 5 km/s.[5] In 1986, O. J. Eggen included it as a probable member of the Hyades Stream of co-moving stars.[9]
 | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cancer[1] |
| Right ascension | 08h 10m 13.107s[2] |
| Declination | +25° 50′ 40.13″[2] |
| Apparent magnitude (V) | +6.41[3] |
| Characteristics | |
| Evolutionary stage | red giant branch[2] |
| Spectral type | K3 III[4][1] |
| B−V color index | 1.420±0.015[1] |
| Astrometry | |
| Radial velocity (Rv) | 4.96±0.23[5] km/s |
| Proper motion (μ) | RA: −14.654 mas/yr Dec.: −30.976 mas/yr |
| Parallax (π) | 3.3894±0.0255 mas |
| Distance | 962 ± 7 ly (295 ± 2 pc) |
| Absolute magnitude (MV) | −0.56[1] |
| Details[2] | |
| Mass | 4.90+0.04 −0.11 M☉ |
| Radius | 34.1±0.2 R☉ |
| Luminosity | 486.0±6.5 L☉ |
| Surface gravity (log g) | 1.820±0.006 cgs |
| Temperature | 4,522±5 K |
| Other designations | |
| ψ1 Cancri, 13 Cnc, BD+26°1728, GC 11082, HD 67690, HIP 40007, SAO 79991, CCDM 08102+2551, WDS J08102+2551A | |
| Database references | |
| SIMBAD | data |
This is an aging K-type giant star with a stellar classification of K3 III,[4] having exhausted the supply of hydrogen at its core and evolved away from the main sequence. Stellar models of this star indicate it has an estimated 4.9 times the mass of the Sun and has expanded to 34 times the Sun's radius. It is radiating 486 times the luminosity of the Sun from its photosphere at an effective temperature of 4,522 K.[2]