Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cygnus |
Right ascension | 20h 39m 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 | |
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±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. [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 | — | — |
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cygnus |
Right ascension | 20h 39m 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 | |
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±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. [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 | — | — |