Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Cancer |
Right ascension | 09h 15m 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 | |
Database references | |
SIMBAD | data |
82 Cancri is a solitary, [3] orange-hued star in the zodiac constellation of Cancer. 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]