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Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension  19h 16m 18.6100s[1]
Declination +46° 00′ 18.813″[1]
Apparent magnitude (V) 13.988
Spectral type G1IV
Proper motion (μ) RA: −1.107±0.031[1] mas/yr
Dec.: −13.083±0.029[1] mas/yr
Parallax (π)0.7982 ± 0.0151[1] mas
Distance4,090 ± 80 ly
(1,250 ± 20 pc)
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

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[edit]

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]
(in order from star)
Mass Semimajor axis
Orbital period
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[edit]


  1. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia Data Release 2 Vizier catalog entry
  2. ^ a b c d Johnson, Michele (9 April 2015). "How many exoplanets has Kepler discovered?".
  3. ^ a b c d Lissauer, Jack J.; Marcy, Geoffrey W.; Rowe, Jason F.; Bryson, Stephen T.; Adams, Elisabeth; Buchhave, Lars A.; Ciardi, David R.; Cochran, William D.; Fabrycky, Daniel C.; Ford, Eric B.; Fressin, Francois; Geary, John; Gilliland, Ronald L.; Holman, Matthew J.; Howell, Steve B.; Jenkins, Jon M.; Kinemuchi, Karen; Koch, David G.; Morehead, Robert C.; Ragozzine, Darin; Seader, Shawn E.; Tanenbaum, Peter G.; Torres, Guillermo; Twicken, Joseph D. (10 May 2012). "Almost All of Kepler's Multiple Planet Candidates are Planets". The Astrophysical Journal. 750 (2): 112. arXiv:1201.5424. Bibcode:2012ApJ...750..112L. doi:10.1088/0004-637X/750/2/112.
  4. ^ "Archived copy". Archived from the original on 2012-04-26. Retrieved 2012-02-01.CS1 maint: Archived copy as title (link)

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