HD 204521

HD 204521
Location of HD 204521; not visible on this chart, but just to the west of β Cephei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Cepheus
Right ascension 21h 25m 16.79696s[1]
Declination +70° 28′ 39.1434″[1]
Apparent magnitude (V) 7.26[2] (binoculars)
Characteristics
Spectral type G0V[3]
B−V color index 0.619±0.015[2]
Astrometry
Radial velocity (Rv)−76.78±0.12[1] km/s
Proper motion (μ) RA: +40.632[1] mas/yr
Dec.: +39.411[1] mas/yr
Parallax (π)37.9375 ± 0.0155 mas[1]
Distance85.97 ± 0.04 ly
(26.36 ± 0.01 pc)
Absolute magnitude (MV)5.15[2]
Details
Mass0.77±0.03[4] or 0.997[5] M☉
Radius0.92[1] R☉
Luminosity0.76[1] L☉
Surface gravity (log g)4.43±0.02[4] cgs
Temperature5,699±50[4] K
Metallicity [Fe/H]−0.75±0.05[4] dex
Rotational velocity (v sin i)3.6[6] km/s
Age8.43±4.24[7] Gyr
Other designations
BD+69°1169, GJ 4194, HD 204521, HIP 105766, SAO 10045, TYC 4465-1133-1[8]
Database references
SIMBADdata

HD 204521 is a star in the northern constellation of Cepheus. In the sky it positioned just to the west of the magnitude 3.2 star Beta Cephei (β Cep). This object has a yellow hue similar to the Sun but is too faint to be visible to the naked eye with an apparent visual magnitude of 7.26.[2] It is located at a distance of 86 light years from the Sun based on parallax, and has an absolute magnitude of 5.15.[2] The star is drifting closer with a radial velocity of −77 km/s,[2] and is predicted to come to within 7.96 light-years in 334,000 years.[5] At that distance the star can have a relatively small perturbing effect on comets in the Oort cloud.[9]

This is an ordinary G-type main-sequence star with a stellar classification of G0V,[3] indicating that it is generating energy through core hydrogen fusion. It is roughly 8 billion years old[7] and appears metal-deficient.[10] The mass of this star appears to be at or below that of the Sun, and it is radiating 76% of the Sun's luminosity from its photosphere at an effective temperature of 5,699 K.[4]

  1. ^ a b c d e f g h Cite error: The named reference dr3 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Gray2003 was invoked but never defined (see the help page).
  4. ^ a b c d e Cite error: The named reference AguileraGómez2018 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference BailerJones2018 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference glebocki2006 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Pace2013 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 Torres2019 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Bond1970 was invoked but never defined (see the help page).