50 Cancri
Star in the constellation Cancer
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50 Cancri is a single[9] star in the zodiac constellation of Cancer, located 183 light years away from the Sun.[1] It has the Bayer designation A2 Cancri; 50 Cancri is the Flamsteed designation. It is faintly visible to the naked eye as a white-hued star with an apparent visual magnitude of 5.89.[2] The star is moving away from the Earth with a heliocentric radial velocity of 23 km/s, having come to within 118 light-years some 1.2 million years ago.[2]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 46m 56.01919s[1] |
| Declination | +12° 06′ 35.8305″[1] |
| Apparent magnitude (V) | 5.89[2] |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | A1 Vp[3] |
| B−V color index | 0.120±0.005[2] |
| Variable type | None[4] |
| Astrometry | |
| Radial velocity (Rv) | 23.3±2.9[2] km/s |
| Proper motion (μ) | RA: −63.773[1] mas/yr Dec.: −50.694[1] mas/yr |
| Parallax (π) | 17.7961±0.0792 mas[1] |
| Distance | 183.3 ± 0.8 ly (56.2 ± 0.3 pc) |
| Absolute magnitude (MV) | +1.82±0.01[4] |
| Details | |
| Mass | 2.1[5] M☉ |
| Luminosity | 10.8±0.21[5] L☉ |
| Surface gravity (log g) | 4.40[6] cgs |
| Temperature | 8,340±48[5] K |
| Rotational velocity (v sin i) | 18[7] km/s |
| Age | 264[6] Myr |
| Other designations | |
| A2 Cancri, 50 Cnc, BD+12°1904, HD 74873, HIP 43121, HR 3481, SAO 98117[8] | |
| Database references | |
| SIMBAD | data |
This is a chemically peculiar A-type main-sequence star with a stellar classification of A1 Vp.[3] It is a Lambda Boötis star displaying strongly-depleted iron peak and alpha process elements, but otherwise relatively normal solar abundances.[5] The star shows no variability down to a detection limit of 1.6 millimagnitudes.[10] It is 264[6] million years old with a relatively low projected rotational velocity of 18 km/s.[7] 50 Cancri has 2.1[5] times the mass of the Sun and is radiating 11[5] times the Sun's luminosity from its photosphere at an effective temperature of 8,340 K.[5]
50 Cancri has an infrared excess, which most likely indicates a debris disk in orbit around the host star. A blackbody model of the emission shows a two component fit, with the warm section having a temperature of 246±91 K at a radius of 4±3 AU from the star, and a cool component at 108±21 K with a separation of 22±8 AU.[5]