Kepler-56
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Graphical sketch of the Kepler-56 system. The line of sight from Earth is illustrated by the dashed line, and dotted lines show the orbits of three detected companions in the system. The solid arrow marks the rotation axis of the host star, and the thin solid line marks the host star equator. Credit: NASA GSFC/Ames/D Huber |
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| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 35m 02s |
| Declination | +41° 52′ 19″ |
| Apparent magnitude (V) | 13 |
| Characteristics | |
| Spectral type | G0V[citation needed] |
| Astrometry | |
| Proper motion (μ) | RA: 19:35:02 mas/yr Dec.: +41:52:19 mas/yr |
| Details | |
| Mass | 1.37 M☉ |
| Radius | 4.23 R☉ |
| Temperature | 4931 K |
| Other designations | |
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Kepler-56
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| Database references | |
| SIMBAD | data |
| Extrasolar Planets Encyclopaedia |
data |
Kepler-56 is a star roughly 2,800 light years away[1] with slightly more mass than the Sun. It has two confirmed planets, one slightly smaller than Neptune, and another slightly smaller than Saturn. Both planets were discovered in 2012.
Planetary system
In 2012, a planetary system was discovered around Kepler-56 via transit method. Planets were subsequently confirmed through transit timing variation method.
Asteroseismological studies revealed that the orbits of Kepler-56b and Kepler-56c are about 45° misaligned to the host star's equator. Follow-up radial velocity measurements revealed the evidence of a gravitational perturbator but currently it is not clear if it is a nearby star or a third planet.[2]
Both Kepler-56b and Kepler-56c will be devoured by their parent star in 130 and 155 million years, respectively.[3][4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.07 MJ | 0.1028 | 10.5034294 | — | 79.640° | 3.606495320 R⊕ |
| c | 0.569 MJ | 0.1652 | 21.4050484 | — | 81.930° | 7.844702558 R⊕ |
| d (unconfirmed) | 3.3 MJ | 2 | 899 | 0.4 | ~55° | — |
