HD 192699

HD 192699 is a star located approximately 238 light-years away in the constellation of Aquila. It has the apparent magnitude of 6.45. Based on its mass of 1.68 solar, it was an A-type star when it was a main-sequence. In April 2007, a planet was announced orbiting the star, together with HD 175541 b and HD 210702 b.^[7]

HD 192699 / Chechia

Observation data Epoch J2000      Equinox J2000
Constellation	Aquila[1]
Right ascension	20h 16m 06.00378s[2]
Declination	+04° 34′ 50.8600″[2]
Apparent magnitude (V)	6.44[1]
Characteristics
Evolutionary stage	red giant branch[3][2]
Spectral type	G8 IV[4]
B−V color index	0.867±0.006[1]
Astrometry
Proper motion (μ)	RA: −40.884 mas/yr[2] Dec.: −51.962 mas/yr[2]
Parallax (π)	13.7264±0.0290 mas[2]
Distance	237.6 ± 0.5 ly (72.9 ± 0.2 pc)
Absolute magnitude (MV)	2.36[1]
Details[5]
Mass	1.26±0.19 M☉
Radius	4.41±0.21 R☉
Luminosity	12.26[1] L☉
Surface gravity (log g)	3.25 cgs
Temperature	5,041 K
Metallicity [Fe/H]	−0.12 dex
Age	3.2+1.2 −0.7 Gyr
Other designations
Chechia, BD+04°4395, FK5 3623, HD 192699, HIP 99894, HR 7288, SAO 125628, TYC 504-2358-1, GSC 00504-02358, 2MASS J20160600+0434509[6]
Database references
SIMBAD	data
Exoplanet Archive	data

Although the published spectral class of G8 IV suggests that HD 192699 is a subgiant, models of the star suggest it has reached the base of the red giant branch, having developed a degenerate helium core.^[2][3]

The star HD 192699 is named Chechia. The name was selected in the NameExoWorlds campaign by Tunisia, during the 100th anniversary of the IAU. Chechia is a flat-surfaced, traditional red wool hat.^[8][9]

The HD 192699 planetary system^[10]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b / Khomsa	≥2.096±0.093 MJ	1.063±0.049	340.94±0.92	0.082±0.041	—	—

See also

• HD 175541
• HD 210702
• List of extrasolar planets