CH Cygni

Not to be confused with Chi Cygni.
CH Cygni
Location of CH Cygni (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 19h 24m 33.06773s[1]
Declination +50° 14′ 29.1263″[1]
Apparent magnitude (V) 5.60 – 8.49[2]
Characteristics
Spectral type M7IIIab + Be[3]
Variable type Z And and SR[2]
Astrometry
Radial velocity (Rv)−59.74[4] km/s
Proper motion (μ) RA: −7.09[1] mas/yr
Dec.: −59.74[1] mas/yr
Parallax (π)5.4642 ± 0.2172 mas[5]
Distance600 ± 20 ly
(183 ± 7 pc)
Orbit[6]
Period (P)15.58±0.13 yr
Semi-major axis (a)8.5 AU
Eccentricity (e)0.122±0.024
Inclination (i)84°
Semi-amplitude (K1)
(primary)		4.45±0.12 km/s
Details[6]
Red giant
Mass2 M☉
Radius280 R☉
Luminosity5012 L☉
Temperature3,100 K
White dwarf
Mass0.7 M☉
Luminosity0.25 L☉
Other designations
HD 182917, BD+49°2999, HIP 95413, SAO 31632
Database references
SIMBADdata

CH Cygni (CH Cyg / HIP 95413 / BD +49 2999) is a red giant, variable, symbiotic binary in the constellation Cygnus. It is the nearest symbiotic star to Earth, and one of the brightest, making it an ideal candidate for study.

  1. ^ a b c d Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference gcvs was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference shenavrin was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference famaey2009 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference dr2 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference hinkle2009 was invoked but never defined (see the help page).