HD 200964

HD 200964
Observation data
Epoch J2000      Equinox J2000
Constellation Equuleus[1]
Right ascension 21h 06m 39.842s[2]
Declination +03° 48′ 11.23″[2]
Apparent magnitude (V) +6.48[1]
Characteristics
Spectral type G8 IV[3]
B−V color index 0.880±0.009[1]
Astrometry
Radial velocity (Rv)−72.63±0.03[4] km/s
Proper motion (μ) RA: 94.748 mas/yr[2]
Dec.: 50.418 mas/yr[2]
Parallax (π)13.7656 ± 0.0275 mas[2]
Distance236.9 ± 0.5 ly
(72.6 ± 0.1 pc)
Absolute magnitude (MV)2.19[1]
Details
Mass1.44±0.09[5] M☉
Radius4.30±0.09[5] R☉
Luminosity13.758±0.064[6] L☉
Surface gravity (log g)3.6±0.1[5] cgs
Temperature5,164±44[5] K
Metallicity [Fe/H]−0.15±0.04[5] dex
Rotational velocity (v sin i)2.28±0.5[5] km/s
Age3.0±0.6[5] Gyr
Other designations
10 G. Equ, BD+03°4501, HD 200964, HIP 104202, SAO 126546[7]
Database references
SIMBADdata

HD 200964 is a star with a pair of orbiting exoplanets[5] located in the northern constellation of Equuleus.[1] It has an apparent visual magnitude of +6.48,[1] which puts it at the lower limit of visibility to the naked eye, but binoculars would make it easy to see. Based on parallax measurements, the distance to this system is 238 light years, but it is drifting closer with a heliocentric radial velocity of −72.6 km/s.[4]

This is a G-type subgiant star[5] with a stellar classification of G8 IV.[3] It is a 3.3 billion year old star that has exhausted the supply of hydrogen at its core and has begun to evolve away from the main sequence, where it was an A-type star.[5] The star has 44% more mass than the Sun and is spinning with a projected rotational velocity of 2.3 km/s. The abundance of iron, an indicator of the star's metallicity, is lower than in the Sun. The star has swelled to 4.3 times the radius of the Sun and it is radiating nearly 14 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 5,164 K.[5]

  1. ^ a b c d e f Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk_Swift_1999 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Soubiran_et_al_2018 was invoked but never defined (see the help page).
  5. ^ a b c d e f g h i j k Cite error: The named reference Johnson2011 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Johns_et_al_2018 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).