Iota Cancri

ι Cancri
Location of ι Cancri (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cancer
ι Cnc A
Right ascension 08h 46m 41.81988s[1]
Declination +28° 45′ 35.6190″[1]
Apparent magnitude (V) 4.02[2]
ι Cnc B
Right ascension 08h 46m 39.98118s[1]
Declination +28° 45′ 54.1932″[1]
Apparent magnitude (V) 6.57[3]
Characteristics
Spectral type G8IIIa Ba0.2[4] + A2V[5]
Astrometry
ι Cnc A
Radial velocity (Rv)15.74 ± 0.13[6] km/s
Proper motion (μ) RA: -21.58 ± 0.75[1] mas/yr
Dec.: -45.69 ± 0.56[1] mas/yr
Parallax (π)9.85 ± 0.61 mas[1]
Distance330 ± 20 ly
(102 ± 6 pc)
Absolute magnitude (MV)−0.79[7]
ι Cnc B
Radial velocity (Rv)25.00 ± 1.5[8] km/s
Proper motion (μ) RA: -22.74 ± 3.45[1] mas/yr
Dec.: -46.36 ± 2.56[1] mas/yr
Parallax (π)11.69 ± 2.75 mas[1]
Distanceapprox. 280 ly
(approx. 90 pc)
Details
ι Cnc A
Mass3.43[9] M☉
Radius21[6] R☉
Luminosity204[6] L☉
Surface gravity (log g)2.5[6] cgs
Temperature4,954[7] K
Metallicity [Fe/H]−0.14[6] dex
Rotational velocity (v sin i)170[10] km/s
ι Cnc B
Luminosity14.39[11] L☉
Temperature8,786[11] K
Age263[9] Myr
Other designations
48 Cancri
Iota Cancri A: HR 3475, HD 74739, BD+29°1824, HIP 43103, SAO 80416
Iota Cancri B: HR 3474, HD 74738, BD+29°1823, HIP 43100, SAO 80415
Database references
SIMBADdata
ι Cancri A and B (Jeffrey Fisher)

Iota Cancri (ι Cnc, ι Cancri) is a double star in the constellation Cancer approximately 300 light years from Earth.

The two stars of ι Cancri are separated by 30 arcseconds, changing only slowly. Although no orbit has been derived, the two stars show a large common proper motion and are assumed to be gravitationally related.[12]

The brighter star, ι Cancri A, is a yellow G-type giant with an apparent magnitude of +4.02. It is a mild barium star, thought to be formed by mass transfer of enriched material from an asymptotic giant branch star onto a less evolved companion. No such donor has been detected in the ι Cancri system, but it is assumed that there is an unseen white dwarf.[13]

The fainter of the two stars, ι Cancri B, is a white A-type main sequence dwarf with an apparent magnitude of +6.57. It is a shell star, surrounded by material expelled by its rapid rotation.[14]

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