Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Lynx |
G 107-69 | |
Right ascension | 07h 30m 42.7784s [1] |
Declination | +48° 11′ 58.5889″ [1] |
Apparent magnitude (V) | 13.2 [2] |
G 107-70 | |
Right ascension | 07h 30m 46.9572s [1] |
Declination | +48° 10′ 06.2765″ [1] |
Apparent magnitude (V) | 15.00 [3] |
Characteristics | |
Spectral type | M4.5+DA+DA |
Astrometry | |
G 107-69 | |
Radial velocity (Rv) | −56.486±0.0035 [4] km/s |
Proper motion (μ) |
RA: −201.282±0.027
mas/
yr
[1] Dec.: −1,272.162±0.020 mas/ yr [1] |
Parallax (π) | 88.7231 ± 0.0298 mas [1] |
Distance | 36.76 ± 0.01
ly (11.271 ± 0.004 pc) |
Details | |
G 107-69A | |
Mass | 0.17 [2] M☉ |
Radius | 0.21 [5] R☉ |
Luminosity | 0.003 [6] L☉ |
Surface gravity (log g) | 5.0±0.13 [7] cgs |
Temperature | 3,200±25 [7] K |
Metallicity [Fe/H] | −0.15±0.09 [7] dex |
G 107-69B | |
Mass | 0.08 [2] M☉ |
G 107-70A | |
Mass | 0.634±0.01 [3] M☉ |
G 107-70B | |
Mass | 0.599±0.01 [3] M☉ |
Other designations | |
Database references | |
SIMBAD | G 107-69 |
G 107-70 |
G 107-69/70 is a quadruple system, consisting of the astrometric binary G 107-69 and the resolved binary G 107-70. [2] The system is 36.76 light years (11.27 parsecs) from Earth. [1] G 107-69 and G 107-70 are separated by 103.2 arcseconds, or 1163 astronomical units (AU). [2]
G 107-69A is a red dwarf star with a spectral type of M4.5 [7] and a mass of about 0.17 M☉. G 107-69B has a mass of about 0.08 M☉ or 84 MJ. The binary has a period of 0.94 years and a predicted separation of about 50 mas. [2] From its mass G 107-69B could be either a low-mass red dwarf star or a brown dwarf.
G 107-70 (also called WD 0727+482) is a pair of white dwarfs, with both having similar mass, brightness and atmospheric composition. [3] [8] The binary was first partially resolved in 1976. [9] Later Nelan et al. fully resolved the orbit of this binary with Hubble's Fine Guidance Sensor and found an orbital period of 18.84±0.02 years and a semi-major axis of 663.62±0.79 mas. [3] At a distance of 11.27 parsecs the semi-major axis is about 7.5 AU.
By resolving the orbit of the G 107-70 system Nelan et al. were able to calculate the dynamical mass of each component: G 107-70A has a mass of 0.634±0.01 M☉ and G 107-70B has a mass of 0.599±0.01 M☉. [3] Both white dwarfs have a spectral type of DA, which indicates an atmosphere dominated by hydrogen. [8]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Lynx |
G 107-69 | |
Right ascension | 07h 30m 42.7784s [1] |
Declination | +48° 11′ 58.5889″ [1] |
Apparent magnitude (V) | 13.2 [2] |
G 107-70 | |
Right ascension | 07h 30m 46.9572s [1] |
Declination | +48° 10′ 06.2765″ [1] |
Apparent magnitude (V) | 15.00 [3] |
Characteristics | |
Spectral type | M4.5+DA+DA |
Astrometry | |
G 107-69 | |
Radial velocity (Rv) | −56.486±0.0035 [4] km/s |
Proper motion (μ) |
RA: −201.282±0.027
mas/
yr
[1] Dec.: −1,272.162±0.020 mas/ yr [1] |
Parallax (π) | 88.7231 ± 0.0298 mas [1] |
Distance | 36.76 ± 0.01
ly (11.271 ± 0.004 pc) |
Details | |
G 107-69A | |
Mass | 0.17 [2] M☉ |
Radius | 0.21 [5] R☉ |
Luminosity | 0.003 [6] L☉ |
Surface gravity (log g) | 5.0±0.13 [7] cgs |
Temperature | 3,200±25 [7] K |
Metallicity [Fe/H] | −0.15±0.09 [7] dex |
G 107-69B | |
Mass | 0.08 [2] M☉ |
G 107-70A | |
Mass | 0.634±0.01 [3] M☉ |
G 107-70B | |
Mass | 0.599±0.01 [3] M☉ |
Other designations | |
Database references | |
SIMBAD | G 107-69 |
G 107-70 |
G 107-69/70 is a quadruple system, consisting of the astrometric binary G 107-69 and the resolved binary G 107-70. [2] The system is 36.76 light years (11.27 parsecs) from Earth. [1] G 107-69 and G 107-70 are separated by 103.2 arcseconds, or 1163 astronomical units (AU). [2]
G 107-69A is a red dwarf star with a spectral type of M4.5 [7] and a mass of about 0.17 M☉. G 107-69B has a mass of about 0.08 M☉ or 84 MJ. The binary has a period of 0.94 years and a predicted separation of about 50 mas. [2] From its mass G 107-69B could be either a low-mass red dwarf star or a brown dwarf.
G 107-70 (also called WD 0727+482) is a pair of white dwarfs, with both having similar mass, brightness and atmospheric composition. [3] [8] The binary was first partially resolved in 1976. [9] Later Nelan et al. fully resolved the orbit of this binary with Hubble's Fine Guidance Sensor and found an orbital period of 18.84±0.02 years and a semi-major axis of 663.62±0.79 mas. [3] At a distance of 11.27 parsecs the semi-major axis is about 7.5 AU.
By resolving the orbit of the G 107-70 system Nelan et al. were able to calculate the dynamical mass of each component: G 107-70A has a mass of 0.634±0.01 M☉ and G 107-70B has a mass of 0.599±0.01 M☉. [3] Both white dwarfs have a spectral type of DA, which indicates an atmosphere dominated by hydrogen. [8]