HD 197037

HD 197037 is a binary star system. Its primary or visible star, HD 197037 A, is a F-type main-sequence star. Its surface temperature is 6150±34 K. HD 197037 A is depleted in heavy elements compared to the Sun, with a metallicity Fe/H index of −0.16±0.03, but is younger at an age of 3.408±0.924 billion years.^[5]

HD 197037

Observation data Epoch J2000      Equinox J2000
Constellation	Cygnus[1]
A
Right ascension	20h 39m 32.95994s[2]
Declination	+42° 14′ 54.7783″[2]
Apparent magnitude (V)	6.813[3]
B
Right ascension	20h 39m 32.93627s[4]
Declination	+42° 14′ 51.1696″[4]
Characteristics
HD 197037 A
Evolutionary stage	main sequence
Spectral type	F7V[5]
HD 197037 B
Spectral type	M[6]
Astrometry
A
Radial velocity (Rv)	9.087±0.199[2] km/s
Proper motion (μ)	RA: −62.745[2] mas/yr Dec.: −222.168[2] mas/yr
Parallax (π)	30.2286±0.0143 mas[2]
Distance	107.90 ± 0.05 ly (33.08 ± 0.02 pc)
Absolute magnitude (MV)	4.26[1]
B
Proper motion (μ)	RA: −54.165[4] mas/yr Dec.: −227.397[4] mas/yr
Parallax (π)	30.3173±0.0339 mas[4]
Distance	107.6 ± 0.1 ly (32.98 ± 0.04 pc)
Position (relative to HD 197037 A)[7]
Component	HD 197037 B
Epoch of observation	2013
Angular distance	3.676±0.011″
Position angle	182.21±0.18°
Projected separation	121 AU
Details[5]
HD 197037 A
Mass	1.063±0.022 M☉
Radius	1.105±0.023 R☉
Luminosity	1.568±0.074 L☉
Surface gravity (log g)	4.37±0.04 cgs
Temperature	6137±20[8] K
Metallicity [Fe/H]	−0.16±0.03 dex
Rotation	19.1 d[3]
Age	3.408±0.924 Gyr
HD 197037 B
Mass	0.3412+0.0098 −0.0477[7] M☉
Radius	0.16[9] R☉
Luminosity	0.01[10] L☉
Temperature	4,766[9] K
Other designations
BD+41 3845, HIP 101948, LTT 16037, NLTT 49662, TYC 3161-126-1, 2MASS J20393296+4214549[11]
Database references
SIMBAD	data

A multiplicity survey detected a red dwarf stellar companion HD 197037 B in 2016, at a projected separation of 121 AU.^[7] The existence of other stellar companions at projected separations from 1.62 to 45.26 AU was excluded.^[5]

Planetary system

In 2012 one planet, named HD 197037 Ab, was discovered on a wide, eccentric orbit by the radial velocity method.^[12]

Another planet in the system was initially suspected, but the radial velocity signal was later attributed to the stellar companion HD 197037 B.^[7]

The HD 197037 A planetary system^[12]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	≥0.79±0.05 MJ	2.07±0.05	1035.7±13	0.22±0.07	—	—