Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cancer |
Right ascension | 08h 40m 43.20572s [1] |
Declination | +19° 43′ 09.5359″ [1] |
Apparent magnitude (V) | 6.83 [2] |
Characteristics | |
Spectral type | A7III [3] |
B−V color index | 0.202±0.004 [2] |
Astrometry | |
Radial velocity (Rv) | +34.6±0.9 [2] km/s |
Proper motion (μ) |
RA: −36.167±0.102
[1]
mas/
yr Dec.: −12.105±0.063 [1] mas/ yr |
Parallax (π) | 5.2981 ± 0.0548 mas [1] |
Distance | 616 ± 6
ly (189 ± 2 pc) |
Absolute magnitude (MV) | 0.56 [2] |
Details | |
Mass | 2.39±0.03 [4] M☉ |
Radius | 4.22±0.27 [4] R☉ |
Luminosity | 51.5±0.7 [1] L☉ |
Temperature | 7,607+258 −313 [1] K |
Metallicity [Fe/H] | −0.08±0.03 [4] dex |
Rotational velocity (v sin i) | 195 [5] km/s |
Age | 603±28 [4] Myr |
Other designations | |
Database references | |
SIMBAD | data |
42 Cancri is a single [7] star in the northern zodiac constellation of Cancer. With an apparent visual magnitude of 6.83, [2] it is dimmer than what is considered the normal lower limit for visibility with the naked eye. The star is located at a distance of approximately 616 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +35 km/s. [2] 42 Cancri is a member of the Beehive Cluster ( NGC 2632). [7]
The stellar classification of this star is A7III, [3] matching an A-type star that is in the giant stage. However, this may be a misclassification of a main sequence star. [8] It has also been classified as a spectroscopic binary, [5] although no orbital elements are published. 42 Cancri is an estimated 603 [4] million years old and is spinning rapidly with a projected rotational velocity of 195 km/s. [5] The star has 2.39 times the mass of the Sun and 4.2 times the Sun's radius. [4] It is radiating 51.5 [1] times the luminosity of the Sun from its photosphere at an effective temperature of 7,607 K. [1]