Lambda Cancri
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 20m 32.13630s |
| Declination | +24° 01′ 20.3198″ |
| Apparent magnitude (V) | +5.93 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | B9.5 V |
| B−V color index | −0.039±0.004 |
| Astrometry | |
| Radial velocity (Rv) | +23.0±4.3 km/s |
| Proper motion (μ) | RA: −20.843 mas/yr Dec.: −18.970 mas/yr |
| Parallax (π) | 5.7362±0.0582 mas |
| Distance | 569 ± 6 ly (174 ± 2 pc) |
| Absolute magnitude (MV) | +0.19 |
| Details | |
| λ Cnc A | |
| Mass | 2.61±0.35 M☉ |
| Radius | 3.69±0.13 R☉ |
| Luminosity | 131±9 L☉ |
| Surface gravity (log g) | 3.72±0.06 cgs |
| Temperature | 10,162±123 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 | |
| Piautos, λ Cnc, 19 Cancri, BD+24°1909, HD 70011, HIP 40881, HR 3268, SAO 80113 | |
| Database references | |
| SIMBAD | data |
Lambda Cancri is a blue-white-hued spectroscopic binary star in the zodiac constellation of Cancer. Its name is a Bayer designation that is Latinized from λ Cancri, and abbreviated Lambda Cnc or λ Cnc. 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 approximately 569 light-years (174 pc) distant from the Sun. The system is drifting further away with a line of sight velocity of around +23 km/s.
The two components are designated Lambda Cancri A (formally named Piautos /piˈɔːtɒs/) and B. The position of this system near the ecliptic means it is subject to lunar occultation.