HD 222109

HD 222109
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 23h 37m 32.04280s[1]
Declination +44° 25′ 44.3723″[1]
Apparent magnitude (V) 5.80[2] (6.08 + 7.38)[3]
Characteristics
Spectral type B8V[4]
U−B color index -0.32[2]
B−V color index -0.06[2]
Astrometry
Radial velocity (Rv)−22.90±3.9[5] km/s
Proper motion (μ) RA: 14.20±0.30[1] mas/yr
Dec.: −17.63±0.45[1] mas/yr
Parallax (π)4.04 ± 0.52 mas[1]
Distanceapprox. 800 ly
(approx. 250 pc)
Orbit[6]
Period (P)351.22 yr
Semi-major axis (a)0.41″
Eccentricity (e)0.39
Inclination (i)40.3°
Longitude of the node (Ω)157.1°
Periastron epoch (T)B 2103.29
Argument of periastron (ω)
(secondary)		0.0°
Details
Mass2.9[7] M☉
Surface gravity (log g)3.932±0.021[8] cgs
Temperature12,157±100[8] K
Rotational velocity (v sin i)158±13[8] km/s
Age54[7] Myr
Other designations
BD+43° 4508, HD 222109, HIP 116582, HR 8962, SAO 53202.
Database references
SIMBADdata

HD 222109 is a binary star system located in the northern constellation of Andromeda. It has a combined apparent visual magnitude of 5.80,[2] which allows it to be visible to the naked eye as a single star. The system has a combined spectral classification of B8V.[4] It is situated at a distance of approximately 800 light years from the Solar System,[1] and the two stars orbit each other with a period of 351.22 years. They are separated by a distance of 0.41″ and have an orbital eccentricity of 0.39.[3] Individually, the stars have apparent magnitudes of 6.08 and 7.38, respectively.[3]

  1. ^ a b c d e f Cite error: The named reference van Leeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference pasp96_441 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference aa546_A69_5 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference aj74_375 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Gontcharov was invoked but never defined (see the help page).
  6. ^ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 14 March 2017.
  7. ^ a b Cite error: The named reference Gullikson2016 was invoked but never defined (see the help page).
  8. ^ a b c Cite error: The named reference apj711_1_605 was invoked but never defined (see the help page).