Zeta Pyxidis

Zeta Pyxidis
Location of ζ Pyxidis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Pyxis
Right ascension 08h 39m 42.47410s[1]
Declination −29° 33′ 39.8989″[1]
Apparent magnitude (V) +4.88[2] (4.97 + 9.59)[3]
Characteristics
Spectral type G6 IIIb CN-0.5[4]
B−V color index +0.90[2]
Astrometry
Radial velocity (Rv)−30.10[5] km/s
Proper motion (μ) RA: −24.81[1] mas/yr
Dec.: −90.96[1] mas/yr
Parallax (π)13.35 ± 0.23 mas[1]
Distance244 ± 4 ly
(75 ± 1 pc)
Absolute magnitude (MV)+0.49[6]
Details
ζ Pyx A
Mass1.96[5] M☉
Luminosity69[5] L☉
Surface gravity (log g)2.72±0.06[7] cgs
Temperature4,876±8[5] K
Metallicity [Fe/H]−0.43±0.02[7] dex
Age1.88[5] Gyr
Other designations
ζ Pyx, CPD−29° 2756, FK5 2680, HD 73898, HIP 42483, HR 3433, SAO 176253, WDS J08397-2934A[8]
Database references
SIMBADdata

Zeta Pyxidis (ζ Pyxidis) is a wide binary star[9] system in the southern constellation of Pyxis. It is visible to the naked eye with a combined apparent visual magnitude of +4.88.[2] Based upon an annual parallax shift of 13.35 mas as seen from Earth,[1] it is located around 244 light years from the Sun.

The yellow-hued primary, component A, is an evolved G-type giant star with a stellar classification of G6 IIIb CN-0.5,[4] where the suffix notation indicating it has anomalously weak lines of cyanogen. At the age of 1.88 billion years,[5] is a red clump star that is generating energy through the fusion of helium at its core.[10] The primary has nearly double the mass of the Sun and is radiating 69 times the Sun's luminosity from its photosphere at an effective temperature of 4,876 K.[5]

The companion, component B, is a magnitude 9.59 star at an angular separation of 52.20 arc seconds along a position angle of 61°, as of 2010.[3]

  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 Cousins1966 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference perkins1989 was invoked but never defined (see the help page).
  5. ^ a b c d e f g Cite error: The named reference luck2015 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Alves2015 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 Eggleton2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Alves2000 was invoked but never defined (see the help page).