| |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 09h15m 13.85196s[1] |
| Declination | +14° 56′ 29.4401″[1] |
| Apparent magnitude (V) | +5.33[2] |
| Characteristics | |
| Spectral type | K1 III[3] |
| U−B color index | +1.31[2] |
| B−V color index | +1.32[2] |
| Astrometry | |
| Radial velocity (Rv) | +27.49±0.19[4] km/s |
| Proper motion (μ) | RA: −40.874[1] mas/yr Dec.: −11.835[1] mas/yr |
| Parallax (π) | 6.0793 ± 0.1222 mas[1] |
| Distance | 540 ± 10 ly (164 ± 3 pc) |
| Absolute magnitude (MV) | −0.98[5] |
| Details | |
| Mass | 2.56±0.13[6] M☉ |
| Radius | 31.01+1.09 −3.52[1] R☉ |
| Luminosity | 307.4±7.3[1] L☉ |
| Temperature | 4,340+270 −74[1] K |
| Metallicity [Fe/H] | −0.195±0.099[7] dex |
| Rotational velocity (v sin i) | 1.3±1.0[8] km/s |
| Other designations | |
π2 Cnc, 82 Cancri, BD+15° 2009, FK5 2733, HD 79554, HIP 45410, HR 3669, SAO 98456[9] | |
| Database references | |
| SIMBAD | data |
82 Cancri is a solitary,[3] orange-hued star in the zodiac constellationofCancer. It has the Bayer designation Pi2 Cancri, which is Latinized from π2 Cancri; 82 Cancri is the star's Flamsteed designation. The star lies just a degree to the south of the ecliptic.[10] With an apparent visual magnitude of +5.33,[2] it is dimly visible to the naked eye on a dark night. This star is located at a distance of approximately 540 light years from the Sun based on parallax. At that range, the visual magnitude is diminished by an extinction of 0.10 magnitudes due to interstellar dust.[11] It is drifting further away with a radial velocity of +27 km/s.[4]
This is an evolved K-type giant star with a stellar classification of K1 III,[3] having exhausted the supply of hydrogen at its core then cooled and expanded off the main sequence. The star currently has 31[1] times the girth of the Sun and is spinning slowly with a projected rotational velocity. It is radiating over 300 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,340 K.[1] Based on its abundance of iron, the star has a lower abundances of heavier elements than the Sun.[7]
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