Omicron2 Cancri

For other stars with this Bayer designation, see ο Cancri.
Omicron2 Cancri
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cancer
Right ascension 08h 57m 35.20006s[1]
Declination +15° 34′ 52.6145″[1]
Apparent magnitude (V) +5.67[2]
Characteristics
Spectral type F0 IV[3][4]
B−V color index +0.204[2]
Astrometry
Proper motion (μ) RA: +60.89[1] mas/yr
Dec.: +19.57[1] mas/yr
Parallax (π)21.68 ± 0.33 mas[1]
Distance150 ± 2 ly
(46.1 ± 0.7 pc)
Absolute magnitude (MV)+2.58[5]
Details[4]
Mass1.72±0.01 M☉
Radius1.62±0.08 R☉
Luminosity10.30±0.43 L☉
Surface gravity (log g)4.25 cgs
Temperature7,868 K
Metallicity [Fe/H]0.2 dex
Rotational velocity (v sin i)90.5±4.5[5] km/s
Age300[6] Myr
Other designations
ο2 Cnc, 63 Cancri, BD+16° 1864, HD 76582, HIP 44001, HR 3565, SAO 98250[7]
Database references
SIMBADdata

Omicron2 Cancri (ο2 Cnc, ο2 Cancri) is a solitary,[8] yellow-white-hued star in the zodiac constellation of Cancer. With an apparent visual magnitude of +5.67,[2] it can be viewed with the naked eye on a dark night. Based upon an annual parallax shift of 21.68 mas as seen from Earth,[1] this star is located around 150 light-years from the Sun. It most likely forms a co-moving pair with Omicron1 Cancri.[9]

With a stellar classification of F0 IV,[3] this is an F-type subgiant star that has left the main sequence and is evolving toward the giant stage. It is estimated to be roughly 300[6] million years old with a relatively high rotation rate, as shown by a projected rotational velocity of around 90.5 km/s.[5] With 1.72 times the mass of the Sun and 1.62 times the Sun's radius, it is radiating 10.3 times the solar luminosity from its photosphere at an effective temperature of 7,868 K.[4]

The star has an infrared excess, suggesting it surrounded by a circumstellar debris disk.[6] Modelling of this structure indicates there are three distinct components, consisting of belts orbiting at distances of about 20 AU, 80 AU and 270 AU from the central star. They are inclined at an angle of 64° to the line of sight along a position angle of 103°. The gaps between the belts are most likely maintained by orbiting planets.[4]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Haeggkvist1966 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Cowley1969 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference Marshall2016 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Reiners2006 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Rhee2007 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 Eggleton2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Shaya2011 was invoked but never defined (see the help page).