GSC 02620-00648 is a double star in the constellation Hercules. The brighter of the pair is a magnitude 12 star located approximately 1,660 light-years away. This star is about 1.18 times as massive as the Sun.[1]
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Hercules |
A[1] | |
Right ascension | 17h 53m 13.0490s[2] |
Declination | +37° 12′ 42.586″[2] |
Apparent magnitude (V) | 11.592[3] |
Ca | |
Right ascension | ~17h 53m 13.0496s[4] |
Declination | ~+37° 12′ 44.139″[4] |
Apparent magnitude (V) | 13.85[1] |
Characteristics | |
Spectral type | F8[1]/K or M[1] |
Apparent magnitude (B) | 12.1120005 ±0.007[5] |
Apparent magnitude (V) | 11.592 ±0.004[5] |
Apparent magnitude (J) | 10.583 ±0.018[3] |
Apparent magnitude (H) | 10.350 ±0.015[3] |
Apparent magnitude (K) | 10.330 ±0.019[3] |
Astrometry | |
A | |
Proper motion (μ) | RA: −6.382[2] mas/yr Dec.: −20.891[2] mas/yr |
Parallax (π) | 1.9686 ± 0.0124 mas[2] |
Distance | 1,660 ± 10 ly (508 ± 3 pc) |
C | |
Proper motion (μ) | RA: −6.307[4] mas/yr Dec.: −20.387[4] mas/yr |
Parallax (π) | 1.9657 ± 0.1076 mas[4] |
Distance | 1,660 ± 90 ly (510 ± 30 pc) |
Details | |
A | |
Mass | 1.18[1] M☉ |
Radius | 1.9[2] R☉ |
Luminosity | 4.6[2] L☉ |
Surface gravity (log g) | 3.98[2] cgs |
Temperature | 6,200±75[citation needed] K |
Metallicity [Fe/H] | +0.14±0.09[citation needed] dex |
Rotational velocity (v sin i) | 8.3[6] km/s |
Age | 4.7±2[citation needed] Gyr |
B | |
Mass | 0.59[1] M☉ |
Other designations | |
Database references | |
SIMBAD | data |
In 2006 the TrES program discovered exoplanet TrES-4b using the transit method.[5] This planet orbits the primary star.[1]
Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b | 0.919 ± 0.073[1] MJ | 0.05091 ± 0.00071[1] | 3.553945 ± 7.5e-05 | 0 | — | 1.799[7] RJ |
In 2008 a study was undertaken of 14 stars with exoplanets that were originally discovered using the transit method through relatively small telescopes. These systems were re-examined with the 2.2M reflector telescope at the Calar Alto Observatory in Spain. This star system, along with two others, was determined to be a previously unknown binary star system. The previously unknown secondary star is a dim magnitude 14 K or M-type star separated by about 755 AU from the primary, appearing offset from the primary by about one arc second in the images. This discovery resulted in a recalculation of parameters for both the planet and the primary star.[1]