GSC 03549-02811
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Draco |
| A | |
| Right ascension | 19h 07m 14.035s[1] |
| Declination | +49° 18′ 59.07″[1] |
| Apparent magnitude (V) | 11.41 |
| B | |
| Right ascension | ~19h 07m 14s[2] |
| Declination | ~+49° 18′ 59″[2] |
| Apparent magnitude (V) | 14.73[2] |
| Characteristics | |
| Spectral type | G0V[1]/K[2] |
| Apparent magnitude (B) | ~12.030[1] |
| Apparent magnitude (V) | 11.411±0.005[1] |
| Apparent magnitude (J) | 10.232±0.020[1] |
| Apparent magnitude (H) | 9.920±0.026[1] |
| Apparent magnitude (K) | 9.846±0.022[1] |
| Astrometry | |
| Proper motion (μ) | RA: 2.9[1] mas/yr Dec.: -3.4[1] mas/yr |
| Distance | 718±33 ly (220±10 pc) |
| Details | |
| Mass | 1.05[2]/0.67[2] M☉ |
| Radius | 1.000+0.036 −0.033[3] R☉ |
| Temperature | 5850±50[3] K |
| Metallicity | −0.15±0.1[3] |
| Age | 5.1+2.7 −2.3×109[3] years |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Extrasolar Planets Encyclopaedia |
data |
GSC 03549-02811 A (referred to as TrES-2 or TrES-2 A in reference to its exoplanet)[4] is a yellow main-sequence star similar to our Sun. This star is located approximately 718 light-years away in the constellation of Draco. The apparent magnitude of this star is 11.41, which means it is not visible to the naked eye but can be seen with a medium-sized amateur telescope on a clear dark night. The age of this star is about 5 billion years.[1]
Contents
Planetary system
In 2006 the exoplanet TrES-2b was discovered by the TrES program using the transit method. It is also within the field of view of the previously operational Kepler Mission planet-hunter spacecraft.[5] This system continues to be studied by other projects and the parameters are continuously improved.[3] The planet orbits the primary star.[2]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| TrES-2b | 1.199±0.052[2] MJ | 0.03556±0.00075[2] | 2.47063±0.00001[5] | 0 | — | 1.272 RJ |
Though TrES-2b is currently the darkest known exoplanet, reflecting less than 1 percent of local sunlight, it does show a faint red glow. This is because its surface is a punishing 1,100'C, so hot that it actually glows red. It is assumed to be tidally locked to its parent star.[6]
Binary star
In 2008 a study was undertaken of fourteen 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 15 K-type star separated by about 232 AU from the primary, appearing offset from the primary by about one arc second in the images. This discovery resulted in a significant recalculation of parameters for both the planet and the primary star.[2]
The Kepler Mission
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In March 2009 NASA launched the Kepler Mission spacecraft. This spacecraft is a dedicated mission to discover extrasolar planets by the transit method from solar orbit. In April 2009 the project released the first light images from the spacecraft and TrES-2b was one of two objects highlighted in these images. Although TrES-2b is not the only known exoplanet in the field of view of this spacecraft it is the only one identified in the first-light images. This object is important for calibration and check-out.[7]
See also
References
- ↑ 1.00 1.01 1.02 1.03 1.04 1.05 1.06 1.07 1.08 1.09 1.10 1.11 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 2.7 2.8 2.9 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 3.3 3.4 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 5.0 5.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ http://news.yahoo.com/coal-black-alien-planet-darkest-ever-seen-220601419.html
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
External links
- Lua error in package.lua at line 80: module 'strict' not found.
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