HD 189733

HD 189733 AB

The location of the HD 189733 system.
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Vulpecula
HD 189733 A
Right ascension 20h 00m 43.71294s[1]
Declination +22° 42′ 39.0732″[1]
Apparent magnitude (V) 7.676[2]
HD 189733 B
Right ascension 20h 00m 42.97791s[3]
Declination +22° 42′ 34.1785″[3]
Apparent magnitude (V) ~10
Characteristics
Spectral type K1.5V[2]/M[4]
Apparent magnitude (B) 8.609 ±0.016/[2]
Apparent magnitude (J) 6.07[2]/10.116 ±0.041[5]
Apparent magnitude (H) 5.59[2]/9.545 ±0.086[5]
Apparent magnitude (K) 5.54[2]/9.323 ±0.027[5]
Variable type BY Draconis[2][6]
Astrometry
HD 189733 A
Radial velocity (Rv)−2.53±0.12[1] km/s
Proper motion (μ) RA: −3.208(11) mas/yr[1]
Dec.: −250.323(14) mas/yr[1]
Parallax (π)50.5668 ± 0.0162 mas[1]
Distance64.50 ± 0.02 ly
(19.776 ± 0.006 pc)
Absolute magnitude (MV)6.2[7]
HD 189733 B
Radial velocity (Rv)1.46±1.21[3] km/s
Proper motion (μ) RA: −12.193(9) mas/yr[3]
Dec.: −253.993(12) mas/yr[3]
Parallax (π)50.6291 ± 0.0136 mas[3]
Distance64.42 ± 0.02 ly
(19.751 ± 0.005 pc)
Orbit
CompanionHD 189733 B
Period (P)3,200 yr
Semi-major axis (a)11.38[8]"
(216 AU)
Details
Mass0.846+0.068
−0.049[9] M☉
Radius0.805±0.016[10] R☉
Luminosity0.328±0.011[10] L☉
Surface gravity (log g)4.56±0.03[10] cgs
Temperature4875±43[10] K
Metallicity [Fe/H]−0.03±0.08[11] dex
Rotation11.953±0.009 days[12]
Age4.3±2.8[10] Gyr
Other designations
V452 Vulpeculae, BD+22 3887, GJ 4130, HD 189733, HIP 98505, SAO 88060, LTT 15851, NLTT 48568, Wolf 864, TOI-4470, TIC 256364928, TYC 2141-972-1, 2MASS J20004370+2242391[2]
Database references
SIMBADA
B
Exoplanet Archivedata

HD 189733, also catalogued as V452 Vulpeculae, is a binary star system 64.5 light-years (19.8 parsecs) away in the constellation of Vulpecula (the Fox). The primary star is suspected to be an orange dwarf star,[2] while the secondary star is a red dwarf star.[5] Given that this system has the same visual magnitude as HD 209458, it promises much for the study of close transiting extrasolar planets. The star can be found with binoculars 0.3 degrees east of the Dumbbell Nebula (M27).

As of 2005, it has been confirmed that an exoplanet, HD 189733 b, orbits the primary star within the system.[13]

  1. ^ a b c d e Cite error: The named reference GaiaDR3A was invoked but never defined (see the help page).
  2. ^ a b c d e f g h i Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference GaiaDR3B was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Bakos2006 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference SIMBAD2 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference absmag was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD4 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference de Kok2013 was invoked but never defined (see the help page).
  10. ^ a b c d e Cite error: The named reference Boyajian2015 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Torres2008 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Henry2008 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Bouchy2005 was invoked but never defined (see the help page).