Iota Cancri
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cancer |
| ι Cnc A | |
| Right ascension | 08h 46m 41.820s |
| Declination | +28° 45′ 35.62″ |
| Apparent magnitude (V) | 4.03 |
| ι Cnc B | |
| Right ascension | 08h 46m 39.980s |
| Declination | +28° 45′ 54.21″ |
| Apparent magnitude (V) | 6.58 |
| Characteristics | |
| ι Cnc A | |
| Spectral type | G8IIIa Ba0.2 |
| B−V color index | 1.007±0.015 |
| ι Cnc B | |
| Evolutionary stage | main sequence |
| Spectral type | A2V |
| B−V color index | 0.051±0.008 |
| Astrometry | |
| ι Cnc A | |
| Radial velocity (Rv) | 15.74±0.13 km/s |
| Proper motion (μ) | RA: −22.070 mas/yr Dec.: −43.699 mas/yr |
| Parallax (π) | 9.4124±0.1621 mas |
| Distance | 347 ± 6 ly (106 ± 2 pc) |
| Absolute magnitude (MV) | −0.79 |
| ι Cnc B | |
| Radial velocity (Rv) | 25.00±1.5 km/s |
| Proper motion (μ) | RA: −24.397 mas/yr Dec.: −44.250 mas/yr |
| Parallax (π) | 9.6720±0.0362 mas |
| Distance | 337 ± 1 ly (103.4 ± 0.4 pc) |
| Details | |
| ι Cnc A | |
| Mass | 2.376±0.011 M☉ |
| Radius | 21 R☉ |
| Luminosity | 204 L☉ |
| Surface gravity (log g) | 2.5 cgs |
| Temperature | 4,954 K |
| Metallicity [Fe/H] | −0.14 dex |
| ι Cnc B | |
| Mass | 2.113±0.035 M☉ |
| Radius | 1.94±0.05 R☉ |
| Luminosity | 24.9±1.2 L☉ |
| Surface gravity (log g) | 4.23±0.06 cgs |
| Temperature | 9,259±139 K |
| Rotational velocity (v sin i) | 170 km/s |
| Age | 263 Myr |
| Other designations | |
| ι Cancri, 48 Cancri, WDS J08467+2846 | |
| Iota Cancri A: Yuyu, NSV 4238, BD+29°1824, FK5 328, GC 12083, HD 74739, HIP 43103, HR 3475, SAO 80416 | |
| Iota Cancri B: BD+29°1823, GC 12080, HD 74738, HIP 43100, HR 3474, SAO 80415, TIC 117355623 | |
| Database references | |
| SIMBAD | A |
| B | |
Iota Cancri, also named Yuyu, is a double star in the constellation Cancer. The brighter component is located at a distance of approximately 347 light-years (106 pc) from Earth based on parallax measurements, and is drifting further away with a line of sight velocity of 16 km/s.
The two stars of ι Cancri are separated by 30.5 arcseconds as of 2019, corresponding to a projected separation of 3,236 AU (0.05 ly). Although no orbit has been derived, the pair show a large common proper motion and are assumed to be gravitationally related.