HD 222093

HD 222093
Observation data
Epoch J2000      Equinox J2000
Constellation Aquarius
Right ascension 23h 37m 39.56021s[1]
Declination −13° 03′ 36.8732″[1]
Apparent magnitude (V) 5.68[2] + 9.6[3] or 11.19[4]
Characteristics
Evolutionary stage horizontal branch
Spectral type K0III[5]
U−B color index +0.81[2]
B−V color index +0.99[2]
Astrometry
Radial velocity (Rv)−12.56±0.15[1] km/s
Proper motion (μ) RA: +34.676[1] mas/yr
Dec.: +26.758[1] mas/yr
Parallax (π)11.1185 ± 0.1442 mas[1]
Distance293 ± 4 ly
(90 ± 1 pc)
Details
Mass1.51[6] M☉
Radius10.00+0.47
−1.06[1] R☉
Luminosity50.0±0.8[1] L☉
Surface gravity (log g)2.7[7] cgs
Temperature4,853+279
−110[1] K
Metallicity [Fe/H]−0.25[7] dex
Rotational velocity (v sin i)0.0[7] km/s
Age3.17[6] Gyr
Other designations
BD−13°6439, HD 222093, HIP 116591, HR 8958, SAO 165804[8]
Database references
HD 222093
SIMBADdata
ADS 16878
SIMBADdata

HD 222093 is a double star in the equatorial constellation of Aquarius. It has an orange hue and is visible to the naked eye with an apparent visual magnitude of 5.68.[2] The system is located at a distance of approximately 293 light years from the Sun based on parallax, but is drifting closer with a radial velocity of −13 km/s.[1]

The primary component is an aging K-type giant star with a stellar classification of K0III,[5] which indicates it has exhausted the supply of hydrogen at its core then cooled and expanded. At present it has ten[1] times the Sun's radius. This is a red clump giant,[9] which indicates it is on the horizontal branch and is generating energy through helium fusion at its core. It is around three billion years old with 1.5 times the mass of the Sun.[6] The star is radiating fifty times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,853 K.[1]

According to Eggleton and Tokovinin (2008), this is most likely a wide binary star system; the secondary companion is a magnitude 9.6 star at an angular separation of 33.1″ from the primary.[3] However, the Washington Visual Double Star Catalog gives a magnitude of 11.19 with an angular separation of 30.2″.[4]

  1. ^ a b c d e f g h i j k l Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference MERMILLIOD was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference mnras389_2_869 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference luck2015 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference aj135_1_209 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 Alves2000 was invoked but never defined (see the help page).