Chi Cygni information

χ Cygni
	Location of χ Cygni (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Cygnus
Right ascension	19h 50m 33.92439s
Declination	+32° 54′ 50.6097″
Apparent magnitude (V)	3.3 – 14.2
Characteristics
Spectral type	S6+/1e = MS6+ (S6,2e – S10,4e)
U−B color index	−0.30 – +0.98
B−V color index	+1.56 – +2.05
Variable type	Mira
Astrometry
Radial velocity (Rv)	+1.60 km/s
Proper motion (μ)	RA: -20.16 mas/yr ; Dec.: -38.34 mas/yr
Parallax (π)	5.53 ± 1.10 mas
Distance	553 ly ; (169 pc)
Absolute magnitude (MV)	−3.2 – +7.7
Details
Mass	2.1+1.5; −0.7 M☉
Radius	348 – 480 R☉
Luminosity	6,000 – 9,000 L☉
Surface gravity (log g)	0.49 cgs
Temperature	2,441 – 2,742 K
Metallicity [Fe/H]	-1.00 dex
Other designations
	χ Cyg, Chi Cyg, HD 187796, BD+32°3593, HIP 97629, HR 7564, SAO 68943
Database references
SIMBAD	data

Chi Cygni (Latinised from χ Cygni) is a Mira variable star in the constellation Cygnus, and also an S-type star. It is around 500 light years away.

χ Cygni is an asymptotic giant branch star, a very cool and luminous red giant nearing the end of its life. It was discovered to be a variable star in 1686 and its apparent visual magnitude varies from as bright as 3.3 to as dim as 14.2, corresponding to a brightness factor of over 20,000. It is only visible to the naked eye for a short period near each maximum.

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Observation data Epoch J2000 Equinox J2000
Location of χ Cygni (circled)
Constellation	Cygnus
Right ascension	19^h 50^m 33.92439^s^[1]
Declination	+32° 54′ 50.6097″^[1]
Apparent magnitude (V)	3.3 – 14.2^[2]
Characteristics
Spectral type	S6+/1e = MS6+^[3] (S6,2e – S10,4e^[4])
U−B color index	−0.30 – +0.98^[5]
B−V color index	+1.56 – +2.05^[5]
Variable type	Mira^[2]
Astrometry

Radial velocity (R_v)	+1.60^[6] km/s
Proper motion (μ)	RA: -20.16^[1] mas/yr Dec.: -38.34^[1] mas/yr
Parallax (π)	5.53 ± 1.10 mas^[1]
Distance	553 ly (169^[7] pc)
Absolute magnitude (M_V)	−3.2 – +7.7^[8]

Details

Mass	2.1+1.5 −0.7^[7] `M`_☉
Radius	348 – 480^[7] `R`_☉
Luminosity	6,000 – 9,000^[7] `L`_☉
Surface gravity (log g)	0.49^[9] cgs
Temperature	2,441 – 2,742^[7] K
Metallicity [Fe/H]	-1.00^[9] dex

Other designations
χ Cyg, Chi Cyg, HD 187796, BD+32°3593, HIP 97629, HR 7564, SAO 68943
Database references
SIMBAD	data

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