Kepler-89
| Observation data Epoch Equinox |
|
|---|---|
| Constellation | Cygnus |
| Right ascension | 19:49:20.0 |
| Declination | +41:53:28 |
| Apparent magnitude (V) | 12.4 |
| Characteristics | |
| Astrometry | |
| Details | |
| Mass | 1.25 ± 0.04 M☉ |
| Radius | 1.656 R☉ |
| Temperature | 6116 K |
| Metallicity [Fe/H] | -0.01 ± 0.04 dex |
| Age | 3.9 ± 0.3 Gyr |
| Other designations | |
|
KOI-94
|
|
Kepler-89 is a star with four confirmed planets. Kepler-89 is a possible wide binary star.[1]
Planetary system
The discovery of four planets orbiting the star was announced October 2012 by analyzing data gathered by Kepler space telescope.[2] Follow-up radial velocity measurements confirmed the existence of Kepler-89d, indicating that Kepler-89d is slightly larger and more massive than Saturn.[3] In October 2013, other three planets were confirmed with Kepler-89c and Kepler-89e getting reasonable mass constraints. Transit-timing variations of the outermost planet suggest that additional planets or minor bodies are present in the system.[4]
In 2012, a partial transit of the second outermost planet by the outermost planet was reported. This was the first time a planet-planet transit in front of the star was detected.[5][2] This allowed to determine the mutual inclination of the planets d and e to be 1.15°.[4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | <10.5 M⊕ | 0.05 | 3.7 | — | 89.3° | 0.13 RJ |
| c | 7.3-11.8 M⊕ | 0.099 | 10.4 | <0.1 | 88.36° | 0.31 RJ |
| d | 0.33±0.034 MJ | 0.165 | 22.3 | <0.1 | 89.871° | 0.83 RJ |
| e | 11.9-15.5 M⊕ | 0.298 | 54.3 | <0.1 | 89.76° | 0.49 RJ |
References
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- ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.
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- ↑ 4.0 4.1 Lua error in package.lua at line 80: module 'strict' not found.
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