Phi2 Pavonis

For other stars with this Bayer designation, see φ Pavonis.
Phi2 Pavonis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Pavo
Right ascension 20h 40m 02.63822s[1]
Declination −60° 32′ 56.0200″[1]
Apparent magnitude (V) +5.10[2]
Characteristics
Spectral type G0 V Fe-0.8 CH-0.5[3]
U−B color index −0.02[2]
B−V color index +0.53[2]
Astrometry
Radial velocity (Rv)−32.02±0.05[4] km/s
Proper motion (μ) RA: +313.48[1] mas/yr
Dec.: −569.91[1] mas/yr
Parallax (π)40.55 ± 0.27 mas[1]
Distance80.4 ± 0.5 ly
(24.7 ± 0.2 pc)
Details[4]
Mass1.09±0.02 M☉
Radius1.86±0.05 R☉
Luminosity3.39 L☉
Surface gravity (log g)4.20±0.02 cgs
Temperature6,091±27 K
Metallicity [Fe/H]−0.38±0.04 dex
Rotation27.7±1.7 d[5]
Rotational velocity (v sin i)1.95±0.43 km/s
Age5.69±0.24 Gyr
Other designations
φ2 Pav, CD−60° 7508, GJ 9701, HD 196378, HIP 101983, HR 7875, SAO 254846[6]
Database references
SIMBADdata
ARICNSdata

Phi2 Pavonis (φ2 Pav, φ2 Pavonis) is a solitary[7] star in the southern constellation of Pavo (the Peacock). It is faintly visible to the naked eye with an apparent visual magnitude of +5.10.[2] Based upon an annual parallax shift of 40.55 mas as seen from Earth, it is located 80.4 light years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.07 due to interstellar dust. It is a member of the thin disk population.[4]

This is a yellow-white hued G-type main sequence star with a stellar classification of G0 V Fe-0.8 CH-0.5.[3] This notation indicates the surface abundance of iron and cyanogen are below normal for this class of star. It is around 5.7[4] billion years old and is spinning with a period of around 28 days.[5] It has an estimated 1.09 times the mass of the Sun and is 1.86 times the Sun's radius. The star is radiating 3.39 times the solar luminosity from its photosphere at an effective temperature of 6,091 K.[4]

This system was in 1991 a test case for the Zeta Herculis moving group, of low metallicity stars with 5 billion years of age. This group includes besides Zeta Herculis: δ Trianguli, ζ Reticuli, 1 Hydrae, Gl 456, Gl 678, and Gl 9079.[8]

In 1998, using the European Southern Telescope in Chile, a planet was announced to be orbiting the star.[9] This team retracted this claim in 2002, but found a different periodicity of 7 days possibly due to stellar rotation.[10]

  1. ^ a b c d e Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Mermilliod1986 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Gray2006 was invoked but never defined (see the help page).
  4. ^ a b c d e Cite error: The named reference Jofre2015 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Olmedo2013 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference PortoDeMello1991 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Kuerster1998 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Endl2002 was invoked but never defined (see the help page).