61 Cancri

61 Cancri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cancer
Right ascension 08h 57m 58.66668s[1]
Declination +30° 14′ 01.7715″[1]
Apparent magnitude (V) +6.290[2] (7.0 + 7.0)[3]
Characteristics
Spectral type F4V[4]
U−B color index −0.04[5]
B−V color index +0.42[5]
Astrometry
Radial velocity (Rv)+10.1±0.3[2] km/s
Proper motion (μ) RA: +48.10[1] mas/yr
Dec.: +27.48[1] mas/yr
Parallax (π)18.01 ± 0.52 mas[1]
Distance181 ± 5 ly
(56 ± 2 pc)
Details
61 Cnc A
Mass1.40[3] M☉
Surface gravity (log g)3.87[6] cgs
Temperature6,396[6] K
Metallicity [Fe/H]−0.34[2] dex
Rotational velocity (v sin i)5[7] km/s
Age2.5[2] Gyr
61 Cnc B
Mass1.40[3] M☉
Other designations
61 Cancri, BD+30°1795, HD 76572, HIP 44031, HR 3563, SAO 61157.[8]
Database references
SIMBADdata

61 Cancri (61 Cnc) is the Flamsteed designation for a visual binary[3] star system in the northern constellation Cancer. The pair have a combined apparent magnitude of 6.25, which means 61 Cancri is faintly visible to the naked eye. (According to the Bortle scale, it can be seen from rural or even dark suburban skies.) Based upon parallax measurements, the system is approximately 181 light years away from Earth.

The two components appear to be roughly identical[9] with individual masses of about 1.4[3] times that of the Sun and apparent magnitudes of 7.0.[3] Their combined stellar classification is F4V,[4] matching that of an F-type main sequence star. They have an angular separation of 0.300″ along a position angle of 129.0° (as of 2014). The pair orbit each other with an estimated period of 40.657 years.[3] No significant level of chromospheric activity has been detected coming from either star.[9]

  1. ^ a b c d e Cite error: The named reference van Leeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference aaa419_989 was invoked but never defined (see the help page).
  3. ^ a b c d e f g Cite error: The named reference aj147_4_87 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference ajss176_1_216 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference aaa34 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference trevor2015 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference aaa393 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. ^ a b Cite error: The named reference Radick1998 was invoked but never defined (see the help page).