5 Cancri

5 Cancri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cancer
Right ascension 08h 01m 30.28830s[1]
Declination +16° 27′ 19.1191″[1]
Apparent magnitude (V) 5.99[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type B9.5 Vn[4]
B−V color index −0.024±0.003[2]
Astrometry
Radial velocity (Rv)−10.0±1.5[5] km/s
Proper motion (μ) RA: +4.12[6] mas/yr
Dec.: −5.43[6] mas/yr
Parallax (π)6.2251 ± 0.1419 mas[1]
Distance520 ± 10 ly
(161 ± 4 pc)
Absolute magnitude (MV)−0.09[2]
Details
Mass2.93±0.10[3] M☉
Radius3.1[7] R☉
Luminosity121.1+20.2
−17.3[3] L☉
Surface gravity (log g)4.5[4] cgs
Temperature9,727+90
−89[3] K
Rotational velocity (v sin i)188[3] km/s
Age36[4] Myr
Other designations
5 Cnc, BD+16°1612, HD 65873, HIP 39236, HR 3134, SAO 97485[8]
Database references
SIMBADdata

5 Cancri is a single[9] star in the zodiac constellation of Cancer, located around 520 light years away from the Sun. It is just visible to the naked eye under good seeing conditions as a dim, blue-white hued star with an apparent visual magnitude of 5.99.[2] This object is moving closer to the Sun with a heliocentric radial velocity of −10 km/s.[5]

At one point this was thought to be a spectroscopic binary system. It is a Be star with a weak circumstellar disk of gas that has around three times the radius of the host star.[10] The stellar classification of 5 Cancri is B9.5 Vn,[4] matching a B-type main-sequence star with "nebulous" lines due to rapid rotation. It is 36[4] million years old with a high projected rotational velocity of 188 km/s.[3] The star has 2.9[3] times the mass of the Sun and about 3.1[7] times the Sun's radius. It is radiating 121[3] times the Sun's luminosity from its photosphere at an effective temperature of 9,727 K.[3]

  1. ^ a b c 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 i Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  4. ^ a b c d e Cite error: The named reference Gullikson2016 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Becker2015 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Fracassini2001 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Ghosh1999 was invoked but never defined (see the help page).