Epoch J2000 Equinox J2000
|Right ascension||19h 16m 18.6100s|
|Declination||+46° 00′ 18.813″|
|Apparent magnitude (V)||13.988|
|Proper motion (μ)|| RA: ±0.031−1.107 mas/yr |
Dec.: ±0.029−13.083 mas/yr
|Parallax (π)||0.7982 ± 0.0151 mas|
|Distance||4,090 ± 80 ly |
(1,250 ± 20 pc)
|Mass||1.164  M☉|
|Radius||1.615  R☉|
|Temperature||5849  K|
|Metallicity [Fe/H]||0.12  dex|
|Age||4.27 ± 0.87  Gyr|
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, 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.
On January 26, 2012, a system of five planets around the star was announced. 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.
(in order from star)
|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|
- 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
- Johnson, Michele (9 April 2015). "How many exoplanets has Kepler discovered?". nasa.gov.
- 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.
- "Archived copy". Archived from the original on 2012-04-26. Retrieved 2012-02-01.CS1 maint: Archived copy as title (link)
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