20h39m32.9601s, +42° 14′ 54.7736″| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 20h39m 32.9601s[1] |
| Declination | 42° 14′ 54.7736″[1] |
| Apparent magnitude (V) | 6.813[2] |
| Characteristics | |
| HD 197037 A | |
| Evolutionary stage | main-sequence star |
| Spectral type | F7V[3] |
| HD 197037 B | |
| Spectral type | M[4] |
| Astrometry | |
| Radial velocity (Rv) | 9.087±0.199[5] km/s |
| Proper motion (μ) | RA: -62.745[5] mas/yr Dec.: -222.168[5] mas/yr |
| Parallax (π) | 30.2286 ± 0.0143 mas[5] |
| Distance | 107.90 ± 0.05 ly (33.08 ± 0.02 pc) |
| Position (relative to HD 197037 A)[6] | |
| 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[3] | |
| 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[7] K |
| Metallicity [Fe/H] | −0.16±0.03 dex |
| Rotation | 19.1 d[2] |
| Age | 3.408±0.924 Gyr |
| HD 197037 B | |
| Mass | 0.3412+0.0098 −0.0477[6] M☉ |
| Other designations | |
BD+41 3845, HIP 101948, LTT 16037, NLTT 49662, TYC 3161-126-1, 2MASS J20393296+4214549[1] | |
| HD 197037 A: Gaia EDR3 2066437688140905600[5] | |
| HD 197037 B: Gaia EDR3 2066437688141580928[8] | |
| Database references | |
| SIMBAD | data |
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±34K. 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.[3]
A multiplicity survey detected a red dwarf stellar companion HD 197037 B in 2016, at a projected separation of 121 AU.[6] The existence of other stellar companions at projected separations from 1.62 to 45.26 AU was excluded.[3]
In 2012 one planet, named HD 197037 Ab, was discovered on a wide, eccentric orbit by the radial velocity method.[9]
Another planet in the system was initially suspected, but the radial velocity signal was later attributed to the stellar companion HD 197037 B.[6]
| 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 | — | — |
