Kepler-33
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cygnus |
| Right ascension | 19h 16m 18.61s[1] |
| Declination | +46° 00′ 18.8″[1] |
| Apparent magnitude (V) | 13.988 |
| Characteristics | |
| Spectral type | G1IV |
| Astrometry | |
| Proper motion (μ) | RA: –0.39[1] mas/yr Dec.: -14.96[1] mas/yr |
| Details | |
| Mass | 1.164 [2] M☉ |
| Radius | 1.615 [2] R☉ |
| Temperature | 5849 [2] K |
| Metallicity [Fe/H] | 0.12 [2] dex |
| Age | 4.27 ± 0.87 [3] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Kepler-33 is a star in the constellation of Cygnus with a system of five known planets. Having begun to evolve from the main sequence,[3] it has roughly 161.5% of the Sun's radius but only 116.4% of the Sun's mass. Given its mass and temperature, it is likely an early G-type star. The star's distance is not known.
Planetary system
On January 26, 2012, a system of five planets around the star was announced.[3] However, unlike other planets confirmed via Kepler, their masses are not known, as Doppler Spectroscopy measurements were not done before the announcement. Judging by their radii, b may be a large Super-Earth or small Hot Neptune while the other four are all likely to be the latter.
Planets b and c may actually be in a 7:3 resonance, as there is a 0.05 day discrepancy; there is also a small 0.18 day discrepancy between a 5:3 resonance between planets c and d. The other planets do not seem to be in any resonances, though near resonances are 3d:2e and 4e:3f.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | — | 0.0677 ± 0.0014 | 5.66793 ± 0.00012 | — | — | 0.16 ± 0.02 RJ |
| c | — | 0.1189 ± 0.0025 | 13.1756 ± 0.00014 | — | — | 0.29 ± 0.027 RJ |
| d | — | 0.1662 ± 0.0035 | 21.776 ± 0.00011 | — | — | 0.48 ± 0.04 RJ |
| e | — | 0.2138 ± 0.0045 | 31.7844 ± 0.00039 | — | — | 0.36 ± 0.034 RJ |
| f | — | 0.2535 ± 0.0054 | 41.029 ± 0.00042 | — | — | 0.4 ± 0.037 RJ |
See also
References
- 1 2 3 4 http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=Kepler-33
- 1 2 3 4 http://kepler.nasa.gov/Mission/discoveries/
- 1 2 3 4 http://arxiv.org/abs/1201.5424
- ↑ http://exoplanet.eu/star.php?st=Kepler-33
Coordinates: 
19h 16m 18.61s, +46° 00′ 18.8″
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