82 Cancri

For other stars with this Bayer designation, see π Cancri.

82 Cancri is a solitary,^[4] 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,^[3] it is dimly visible to the naked eye on a dark night. This star is located at a distance of approximately 574 light-years (176 pc) from the Sun based on parallax measurements. 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 +27.5 km/s.^[5]

82 Cancri

Location of 82 Cancri (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Cancer[1]
Right ascension	09h 15m 13.852s[2]
Declination	+14° 56′ 29.43″[2]
Apparent magnitude (V)	+5.33[3]
Characteristics
Spectral type	K1 III[4]
U−B color index	+1.31[3]
B−V color index	+1.32[3]
Astrometry
Radial velocity (Rv)	+27.49±0.19[5] km/s
Proper motion (μ)	RA: −41.018 mas/yr[2] Dec.: −11.304 mas/yr[2]
Parallax (π)	5.6869±0.0902 mas[2]
Distance	574 ± 9 ly (176 ± 3 pc)
Absolute magnitude (MV)	−0.98[1]
Details
Mass	2.56±0.13[6] M☉
Radius	31.32+0.85 −0.64[2] R☉
Luminosity	435+10 −12[2] L☉
Surface gravity (log g)	2.04±0.02[2] cgs
Temperature	4,703+18 −27[2] 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

This is an evolved K-type giant star with a stellar classification of K1 III,^[4] having exhausted the supply of hydrogen at its core then cooled and expanded off the main sequence. The star 2.6^[6] times the Sun's mass and has expanded to 31^[2] times the girth of the Sun. It is spinning slowly with a projected rotational velocity. This star is radiating 435 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,703 K.^[2] Based on its abundance of iron, the star has a lower abundances of heavier elements than the Sun.^[7]