Kepler-33

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
Mass1.164 [2] M☉
Radius1.615 [2] R☉
Temperature5849 [2] K
Metallicity [Fe/H]0.12 [2] dex
Age4.27 ± 0.87 [3] Gyr
Other designations
KOI-707, KIC 9458613, 2MASS 19161861+4600187[4]
Database references
SIMBADdata

Kepler-33 is a star in the constellation of Cygnus with a system of five known planets. Having begun to evolve off 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 a subgiant 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.

The Kepler-33 planetary system[3]
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. 1 2 3 4 http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=Kepler-33
  2. 1 2 3 4 http://kepler.nasa.gov/Mission/discoveries/
  3. 1 2 3 4 http://arxiv.org/abs/1201.5424
  4. ↑ http://exoplanet.eu/star.php?st=Kepler-33

Coordinates: 19h 16m 18.61s, +46° 00′ 18.8″

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