Kepler-36
Star Kepler-36 |
|||||||
---|---|---|---|---|---|---|---|
AladinLite | |||||||
Observation dates equinox : J2000.0 , epoch : J2000.0 |
|||||||
Constellation | swan | ||||||
Right ascension | 19 h 25 m 0.03 s | ||||||
declination | + 49 ° 13 ′ 54.8 ″ | ||||||
Apparent brightness | 11.94 mag | ||||||
Typing | |||||||
Known exoplanets | 3 | ||||||
Spectral class | G1IV | ||||||
Astrometry | |||||||
distance | 1,530 ly 470 pc |
||||||
Physical Properties | |||||||
Dimensions | 1,071 M ☉ | ||||||
radius | 1.626 R ☉ | ||||||
Effective temperature | 5,911 K | ||||||
Metallicity [Fe / H] | −0.2 | ||||||
Other names and catalog entries |
|||||||
|
Kepler-36 (also KOI-277 ) is a sub-giant the constellation Schwan , 1530 light-years from the sun is removed. The star has a planetary system with two known exoplanets .
properties
Kepler-36 has a higher mass and a larger radius than the sun. However, the star's density is only about 25% of the solar density, and it is also hotter and less metal-rich. According to the measurement data, Kepler-36 is a sub-giant and thus a star that is in the process of developing from the main sequence to a red giant . Its age is 2 to 3 billion years longer than that of the sun.
Planetary system
On June 21, 2012, the discovery of two planets around Kepler-36 was published based on observations made by the Kepler Space Telescope . The two planets are a super-earth and a mini-Neptune , each with probably around 4.5 and 8 Earth masses , which orbit their central star in around 14 and 16 days respectively.
The orbits of both planets are unusually close to each other, with a distance of only 0.013 AU . At their closest approach, Kepler-36b and Kepler-36c are only a little less than two million km apart, which is five times the distance between the earth and the moon and twenty times smaller than the closest distance between two planets in the solar system . Both planets are in an orbital resonance of 7: 6.
Planet (by distance from the star) |
Discovery (year) |
Radius (in ) |
Mass (in M ⊕ ) |
Cycle time (in days) |
Major semi-axis (in AU ) |
eccentricity |
Orbit inclination (in ° ) |
---|---|---|---|---|---|---|---|
Kepler-36b | 2012 | 1.486 ± 0.035 | 4.45 + 0.33−0.27 | 13.83989 +0.00082−0.00060 | 0.1153 ± 0.0015 | <0.039 | 90.01 +0.69−0.71 |
Kepler-36c | 2012 | 3.679 ± 0.054 | 8.08 +0.60−0.46 | 16.23855 +0.00038−0.00054 | 0.1283 ± 0.0016 | <0.033 | 89.98 +0.54−0.53 |
Individual evidence
- ↑ a b SIMBAD: Kepler-36. Retrieved May 30, 2015 .
- ↑ a b c NASA Exoplanet Archive: Kepler 36.Retrieved May 30, 2015 .
- ↑ a b c d e f g h Carter et al .: Kepler-36: A Pair of Planets with Neighboring Orbits and Dissimilar Densities . arxiv : 1206.4718 .
- ^ A b National Aeronautics and Space Administration: Astronomers Discover Planetary Odd Couple. Retrieved May 30, 2015 .
Web links
- Spiegel Online from June 22nd, 2012: Close neighborhood: pair of planets observed during close dance. Retrieved May 30, 2015 . (English)