Omega2 Cancri

For other star systems with this Bayer designation, see ω Cancri.
ω2 Cancri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cancer
Right ascension 08h 01m 43.75679s[1]
Declination +25° 05′ 22.0823″[1]
Apparent magnitude (V) 6.32[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type A1 V[4]
B−V color index 0.023±0.006[2]
Astrometry
Radial velocity (Rv)−7.6±2.5[5] km/s
Proper motion (μ) RA: −25.112[1] mas/yr
Dec.: +12.038[1] mas/yr
Parallax (π)7.4046 ± 0.0486 mas[1]
Distance440 ± 3 ly
(135.1 ± 0.9 pc)
Absolute magnitude (MV)0.51[2]
Details
Mass2.59±0.06[3] M☉
Radius2.5[6] R☉
Luminosity68.0+8.3
−7.3[3] L☉
Temperature9,354+174
−171[3] K
Rotational velocity (v sin i)159[3] km/s
Other designations
ω2 Cancri, 4 Cnc, BD+25°1816, HD 65856, HIP 39263, HR 3132, SAO 79869, CCDM J08017+2506A, WDS J08017+2505A, GSC 01930-00674[7]
Database references
SIMBADdata

ω2 Cancri is a star in the zodiac constellation Cancer, located around 810 light years away from the Sun. It has the Flamsteed designation 4 Cancri; ω2 Cancri is the Bayer designation, which is Latinised to omega2 Cancri and abbreviated to ω2 Cnc or omega2 Cnc. The star is near the lower limit of visibility to the naked eye, having an apparent visual magnitude of 6.32.[2] It is moving closer to the Earth with a heliocentric radial velocity of −8 km/s.[5] The position of this star near the ecliptic means it is subject to lunar occultations.[8]

This is an ordinary A-type main-sequence star with a stellar classification of A1 V,[4] which indicates it is generating energy through hydrogen fusion at its core. It has 2.6[3] times the mass of the Sun and about 2.5[6] times the Sun's radius. The star is radiating 68[3] times the Sun's luminosity from its photosphere at an effective temperature of 9354 K.[3]

  1. ^ a b c d e Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c d e f g h Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Cowley1969 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Fracassini2001 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Schmidtke2011 was invoked but never defined (see the help page).