Psi Capricorni

Psi Capricorni
Location of ψ Capricorni (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Capricornus
Right ascension 20h 46m 05.73263s[1]
Declination −25° 16′ 15.2312″[1]
Apparent magnitude (V) 4.13[2]
Characteristics
Spectral type F5 V[3]
U−B color index −0.03[2]
B−V color index +0.42[2]
Astrometry
Radial velocity (Rv)+20.3[4] km/s
Proper motion (μ) RA: −51.96[1] mas/yr
Dec.: −156.56[1] mas/yr
Parallax (π)68.13 ± 0.27 mas[1]
Distance47.9 ± 0.2 ly
(14.68 ± 0.06 pc)
Absolute magnitude (MV)3.33[5]
Details
Mass1.37[6] M☉
Radius1.51+0.08
−0.04[7] R☉
Luminosity3.82±0.03[7] L☉
Surface gravity (log g)4.25[6] cgs
Temperature6,572+89
−173[7] K
Metallicity [Fe/H]0.15[6] dex
Rotational velocity (v sin i)40.9±2.0[8] km/s
Age1.4[3] Gyr
Other designations
ψ Cap, 16 Capricorni, CD−25°15018, FK5 779, GC 805, HD 197692, HIP 102485, HR 7936, SAO 189664[9]
Database references
SIMBADdata

Psi Capricorni, Latinized from ψ Capricorni, is a single[10] star in the southern zodiac constellation of Capricornus. It is a yellow-white hued star that is faintly visible to the naked eye with an apparent visual magnitude of +4.13.[2] The distance to this star is approximately 47.9 light years based on parallax measurements,[1] and it is drifting further away with a radial velocity of +20 km/s.[4] The closest approach to the Sun occurred some 467,000 years ago at a separation of 20 light-years.[11]

This object is an F-type main-sequence star with a stellar classification of F5 V.[3] It is 1.4[3] billion years old with 1.4[6] times the mass of the Sun. The measured rotational velocity of this star is approximately 41 km/s[8] (the Sun has an equatorial rotation velocity of 2 km/s). Analysis of the line profile of the star's spectrum indicates that it is undergoing differential rotation, with the variation by latitude being similar to the Sun.[12] The star has 1.5[7] times the Sun's radius and is radiating 3.8[7] times the luminosity of the Sun from its photosphere at an effective temperature of 6,572 K.[7] It displays an infrared excess, suggesting the presence of an orbiting debris disk at a separation of 38.75 AU and a temperature of 60 K.[13]

  1. ^ a b c d e f Cite error: The named reference aa474_2_653 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference MERMILLIOD was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference aaa523_A73 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference paas21_2_129 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Reiners2006 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Luck2018 was invoked but never defined (see the help page).
  7. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference AmmlerVonEiff2012 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference BailerJones2015 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference aa376_L13 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Gáspár2016 was invoked but never defined (see the help page).