Zeta Capricorni

Zeta Capricorni
Location of ζ Capricorni (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Capricornus
Right ascension 21h 26m 40.02634s[1]
Declination −22° 24′ 40.8042″[1]
Apparent magnitude (V) 3.77[2]
Characteristics
Spectral type G4Ib: Ba2[3] + DA2.2[4]
U−B color index +0.57[5]
B−V color index +0.99[5]
Variable type Suspected eclipsing binary[6][7]
Astrometry
Radial velocity (Rv)+2.1±0.1[2] km/s
Proper motion (μ) RA: −2.23[1] mas/yr
Dec.: 18.10[1] mas/yr
Parallax (π)8.46 ± 0.21 mas[1]
Distance386 ± 10 ly
(118 ± 3 pc)
Absolute magnitude (MV)−1.59[2]
Orbit[8]
Period (P)2,378.2 d
Semi-major axis (a)8.56±4.3 mas
1.00+1.69
−0.44 AU
Eccentricity (e)0.2821
Inclination (i)111.7±20.7°
Longitude of the node (Ω)190.7±50.0°
Periastron epoch (T)2,445,996 JD
Argument of periastron (ω)
(secondary)		233.8±19.8°
Details[9]
A
Mass4.5+0.3
−0.2 M☉
Radius~29[10] R☉
Luminosity561+180
−143 L☉
Surface gravity (log g)1.7±0.3 cgs
Temperature5,269±53 K
Metallicity [Fe/H]−0.09 dex
B
Mass1.03 M☉
Temperature23,000[4] K
Other designations
ζ Cap, 34 Cap, NSV 25596, CD−22°15388, GC 30020, HD 204075, HIP 105881, HR 8204, SAO 190341, CCDM J21267-2225AB, WDS J21267-2225AB, WD 2123-226[11]
Database references
SIMBADdata

Zeta Capricorni, Latinised from ζ Capricorni, is a binary star system in the southern constellation of Capricornus. It is visible to the naked eye with an apparent visual magnitude of 3.77.[2] The system is located at a distance of approximately 386 light-years from the Sun based on parallax.[1] It is drifting further away with a radial velocity of +2 km/s. The absolute magnitude of this system is −1.59.[2]

  1. ^ a b c d e f Cite error: The named reference van Leeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Keenan_McNeil_1989 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Holberg_et_al_2013 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference UBV was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Srivastava1988 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Samus_et_al_2017 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Pourbaix2000 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Jorissen_et_al_2019 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Kaler was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).