1 Cancri

1 Cancri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cancer
Right ascension 07h 56m 59.45262s[1]
Declination +15° 47′ 25.0019″[1]
Apparent magnitude (V) 5.97[2]
Characteristics
Spectral type K3− III[3]
B−V color index 1.285±0.007[4]
Astrometry
Radial velocity (Rv)+13.55±0.12[1] km/s
Proper motion (μ) RA: −26.731[1] mas/yr
Dec.: −42.7591[1] mas/yr
Parallax (π)6.9810 ± 0.0694 mas[1]
Distance467 ± 5 ly
(143 ± 1 pc)
Absolute magnitude (MV)0.03[4]
Details
Mass1.1[5] M☉
Radius18.7[6] R☉
Luminosity199[1] L☉
Surface gravity (log g)2.03[7] cgs
Temperature4,231[7] K
Metallicity [Fe/H]−0.01[7] dex
Other designations
1 Cnc, BD+16°1590, FK5 1208, HD 64960, HIP 38848, HR 3095, SAO 97399[8]
Database references
SIMBADdata

1 Cancri is a single[2] star in the zodiac constellation of Cancer, positioned near the border with Gemini at a distance of around 467 light years from the Sun. It is barely visible to the naked eye as a dim, orange-hued star with an apparent visual magnitude of 5.97. The object is moving further from the Earth with a heliocentric radial velocity of +14 km/s.

This is an evolved giant star with a stellar classification of K3− III,[3] having exhausted the hydrogen at its core and expanded. It is specified as a spectral standard for that type.[3] The angular diameter of the star measured from a lunar occultation is 2.1±0.6 mas,[9] which, at its estimated distance, equates to a physical radius of about 19 times the radius of the Sun. It is radiating 199 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,231 K.

  1. ^ a b c d e f g Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference perkins1989 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference starhorse was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference ticv8 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference apogee 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 Richichi2005 was invoked but never defined (see the help page).