Lambda Cancri
Lambda Cancri (λ Cancri, abbreviated Lambda Cnc, λ Cnc) is a blue-white-hued spectroscopic binary star in the zodiac constellation of Cancer. With a combined apparent visual magnitude of +5.93, it is faintly visible to the naked eye. Based upon parallax measurements obtained during the Gaia mission, it is about 550 light-years distant from the Sun.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 20m 32.13630s |
| Declination | +24° 01′ 20.3198″ |
| Apparent magnitude (V) | +5.93 |
| Characteristics | |
| Spectral type | B9.5 V |
| Astrometry | |
| Radial velocity (Rv) | +23.0±4.3 km/s |
| Proper motion (μ) | RA: −20.29 mas/yr Dec.: −18.81 mas/yr |
| Parallax (π) | 5.9490 ± 0.1482 mas |
| Distance | 550 ± 10 ly (168 ± 4 pc) |
| Absolute magnitude (MV) | +0.19 |
| Details | |
| λ Cnc A | |
| Mass | 2.1+0.39 −0.32 M☉ |
| Luminosity | 78 L☉ |
| Surface gravity (log g) | 4.0±0.25 cgs |
| Temperature | 9,500±1,000 K |
| Rotational velocity (v sin i) | 188 km/s |
| Age | 105+287 −93 Myr |
| λ Cnc B | |
| Mass | 0.8 M☉ |
| Temperature | 4,562±154 K |
| Metallicity [Fe/H] | −0.5 dex |
| Rotational velocity (v sin i) | 10 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
The two components are designated Lambda Cancri A (formally named Piautos /piˈɔːtɒs/) and B.
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