HD 220689

HD 220689
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Aquarius
Right ascension 23h 25m 52.99170s[1]
Declination –20° 36′ 57.6998″[1]
Apparent magnitude (V) +7.74[2]
Characteristics
Spectral type G3V[3]
B−V color index +0.603±0.002[2]
Astrometry
Radial velocity (Rv)+12.30±0.14[1] km/s
Proper motion (μ) RA: –15.328 mas/yr[1]
Dec.: –177.593 mas/yr[1]
Parallax (π)21.3074 ± 0.0236 mas[1]
Distance153.1 ± 0.2 ly
(46.93 ± 0.05 pc)
Absolute magnitude (MV)4.50[2]
Details[4]
Mass1.016±0.048 M☉
Radius1.068±0.047 R☉
Luminosity1.491±0.005[5] L☉
Surface gravity (log g)4.360±0.045 cgs
Temperature5,921±26 K
Metallicity [Fe/H]−0.07±0.10 dex
Rotation~29 d
Rotational velocity (v sin i)5.5[6] km/s
Age4.586±2.487 Gyr
Other designations
BD–21°6419, GC 32591, HD 220689, HIP 115662, SAO 191898, G 273-43[7]
Database references
SIMBADdata
Exoplanet Archivedata

HD 220689 is a single[8] star in the equatorial constellation of Aquarius. It is a challenge to view with the naked eye, having an apparent visual magnitude of +7.74,[2] but is readily viewed with a pair of binoculars.[9] The star is located at a distance of 153 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +12 km/s.[1] A survey in 2015 has ruled out the existence of any additional stellar companions at projected distances from 26 to 305 astronomical units.[8]

The stellar classification of HD 220689 is G3V,[3] matching a yellow hued G-type main-sequence star that is generating energy through core hydrogen fusion. It is roughly 4.6 billion years old and is spinning with a projected rotational velocity of 5.5 km/s,[6] giving it a rotation period of around 29 days.[4] The star has a similar size, mass, and elemental abundances as the Sun. It is radiating 1.5[5] times the luminosity of the Sun from its photosphere at an effective temperature of 5,921 K.[4]

  1. ^ a b c d e f Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson_Francis_2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk_Smith-Moore_1978 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference Barbato_et_al_2018 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Luck2018 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).
  8. ^ a b Cite error: The named reference Mugrauer_Ginski_2015 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference ICQ was invoked but never defined (see the help page).