Upsilon1 Cancri

For other stars with this Bayer designation, see υ Cancri.
Upsilon1 Cancri
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Cancer
Right ascension 08h 31m 30.51925s[1]
Declination +24° 04′ 51.9890″[1]
Apparent magnitude (V) +5.694[2]
Characteristics
Spectral type F0 IIIn[3]
B−V color index +0.309[2]
Astrometry
Radial velocity (Rv)+19.0±4.3[4] km/s
Proper motion (μ) RA: −81.36[1] mas/yr
Dec.: −44.57[1] mas/yr
Parallax (π)13.05 ± 0.29 mas[1]
Distance250 ± 6 ly
(77 ± 2 pc)
Absolute magnitude (MV)+1.29[5]
Details
Mass1.47[6] M☉
Luminosity25[5] L☉
Surface gravity (log g)3.51[7] cgs
Temperature7,240±246[6] K
Rotational velocity (v sin i)109.2[7] km/s
Age570[6] Myr
Other designations
υ1 Cnc, 30 Cancri, BD+24° 1940, FK5 2666, HD 72041, HIP 41816, HR 3355, SAO 80229[8]
Database references
SIMBADdata

Upsilon1 Cancri, Latinised from υ1 Cancri, is the Bayer designation for a solitary,[3] yellow-white-hued star in the constellation Cancer. It is faintly visible with the naked eye, having an apparent visual magnitude of +5.7.[2] Based upon an annual parallax shift of 13.05 mas as seen from Earth,[1] this system is roughly 250 light-years from the Sun.

This object has a stellar classification of F0 IIIn, indicating it is an F-type giant star.[3] The 'n' suffix indicates "nebulous" absorption lines due to rapid rotation, and it shows a relatively high projected rotational velocity of 109.2 km/s.[7] It is a variable star of unknown type that varies in brightness with an amplitude of 0.05 magnitude.[9] The star is about 570[6] million years old and it has an estimated mass of 1.47[6] times that of the Sun. On average, it is radiating 25[5] times the Sun's luminosity from its photosphere at an effective temperature of 7,240 K.[6]

  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 Hog2000 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b c d e f Cite error: The named reference David2015 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Schroeder2009 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 Adelman2000 was invoked but never defined (see the help page).