| |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cancer |
| ι Cnc A | |
| Right ascension | 08h46m 41.81988s[1] |
| Declination | +28° 45′ 35.6190″[1] |
| Apparent magnitude (V) | 4.02[2] |
| ι Cnc B | |
| Right ascension | 08h46m 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] |
| Distance | 330 ± 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] |
| Distance | approx. 280 ly (approx. 90 pc) |
| Details | |
| ι Cnc A | |
| Mass | 3.43[9] M☉ |
| Radius | 21[6] R☉ |
| Luminosity | 204[6] L☉ |
| Surface gravity (log g) | 2.5[6] cgs |
| Temperature | 4,954[7] K |
| Metallicity [Fe/H] | −0.14[6] dex |
| Rotational velocity (v sin i) | 170[10] km/s |
| ι Cnc B | |
| Luminosity | 14.39[11] L☉ |
| Temperature | 8,786[11] K |
| Age | 263[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 | |
| SIMBAD | data |
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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