HD 199223

HD 199223
Location of HD 199223 (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Delphinus
A
Right ascension 20h 55m 40.6778s[1]
Declination +04° 31′ 57.7994″[1]
Apparent magnitude (V) 6.34±0.01[2]
B
Right ascension 20h 55m 40.5439s[3]
Declination +04° 31′ 58.2271″[3]
Apparent magnitude (V) 7.49±0.01[2]
Characteristics
A
Spectral type G8 III/IV[4]
U−B color index +0.49[5]
B−V color index +0.82[5]
B
Spectral type F/G[6]
Astrometry
Radial velocity (Rv)−32.6±0.4[7] km/s
Absolute magnitude (MV)+0.33[8]
A
Proper motion (μ) RA: +60.413[1] mas/yr
Dec.: +10.949[1] mas/yr
Parallax (π)9.2067 ± 0.0354 mas[1]
Distance354 ± 1 ly
(108.6 ± 0.4 pc)
B
Proper motion (μ) RA: +60.315[3] mas/yr
Dec.: +9.758[3] mas/yr
Parallax (π)9.0757 ± 0.0758 mas[3]
Distance359 ± 3 ly
(110.2 ± 0.9 pc)
Details
A
Mass1.25[9] M☉
Radius8.26+0.65
−0.22[10] R☉
Luminosity37.1±0.4[10] L☉
Surface gravity (log g)2.60±0.25[11] cgs
Temperature4,956+68
−185[10] K
Metallicity [Fe/H]0.13±0.09[11] dex
Rotational velocity (v sin i)<1[12] km/s
B
Mass1.46[9] M☉
Radius2.10+0.16
−0.27[13] R☉
Luminosity8.82±0.23[13] L☉
Surface gravity (log g)3.85[9] cgs
Temperature6,865+494
−251[13] K
Metallicity [Fe/H]−0.2[9] dex
Other designations
1 G. Equulei, AG+04°2834, BD+03°4461, GC 29200, HD 199223, HIP 103301, HR 8010, SAO 126373, WDS J20557+0432[14]
Database references
SIMBADThe system
A
B

HD 199223 (HR 8010) is a double star in the equatorial constellation Delphinus. However, the system was originally in Equuleus prior to the creation of official IAU constellation borders.[15] The components have a separation of 2″ at a position angle of 282° as of 2016.[16] They have apparent magnitudes of 6.34 and 7.49 and distances of 354 and 359 light years respectively. The system is drifting closer with a radial velocity of −33 km/s.

The brighter component has a stellar classification of G8 III/IV,[4] indicating that it is a G-type star with the blended luminosity class of a giant star and a subgiant. It has 125% of the mass of the Sun[9] and an enlarged radius of 8.26 R☉.[10] It shines at 37.1 times the luminosity of the Sun[10] from its photosphere at an effective temperature of 4,956 K,[10] giving it a yellow glow. HD 199223A's iron abundance is 135% that of the Sun[11] and it spins modestly with a projected rotational velocity less than 1 km/s.[12]

As for the dimmer one, it is classified as an F/G star,[6] and is calculated to be an F-type subgiant. It has 146% of the mass of the Sun[9] and 2.1 times its radius.[13] It radiates with a luminosity of 8.82 L☉[13] from its photosphere at an effective temperature of 6,865 K,[13] giving it a yellow white glow.

  1. ^ a b c d e Cite error: The named reference EDR3A was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Fabricius2002 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference EDR3B was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Harlan1974 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Houk1999 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  9. ^ a b c d e f Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  10. ^ a b c d e f Cite error: The named reference DR2A was invoked but never defined (see the help page).
  11. ^ a b c Cite error: The named reference Randich1999 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference deMed1999 was invoked but never defined (see the help page).
  13. ^ a b c d e f Cite error: The named reference DR2B was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Davenhall1997 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Mason2001 was invoked but never defined (see the help page).