Astronomy:Kepler-28
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Short description: Star in the constellation Cygnus
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cygnus[1] |
| Right ascension | 19h 28m 32.8905s[2] |
| Declination | +42° 25′ 45.959″[2] |
| Apparent magnitude (V) | 15.306[3] |
| Characteristics | |
| Spectral type | M0V[4] |
| Astrometry | |
| Proper motion (μ) | RA: −0.488±0.042[2] mas/yr Dec.: 11.692±0.042[2] mas/yr |
| Parallax (π) | 2.2527 ± 0.0241[2] mas |
| Distance | 1,450 ± 20 ly (444 ± 5 pc) |
| Details | |
| Mass | 0.75[3] M☉ |
| Radius | 0.70[3] R☉ |
| Luminosity | [3] L☉ |
| Temperature | 4590[3] K |
| Metallicity [Fe/H] | 0.34[3] dex |
| Rotation | 17.951±0.016 days[5] |
| Rotational velocity (v sin i) | 0.6[3] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| KIC | data |
Kepler-28 is a star in the northern constellation of Cygnus., It is orbited by two exoplanets. It is located at the celestial coordinates: Right Ascension 19h 28m 32.8905s, Declination +42° 25′ 45.959″.[2] With an apparent visual magnitude of 15.036,[3] this star is too faint to be seen with the naked eye.
Planetary system
The two warm sub-Neptune gas giant[6] planets of Kepler-28 were discovered in 2011 and were confirmed in early 2012.[7]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 8.8+3.8−3.1 M⊕ | 0.062 | 5.9123 | — | — | 2.93±0.46 R⊕ |
| c | 10.9+6.1−4.5 M⊕ | 0.081 | 8.9858 | — | — | 2.77±0.44 R⊕ |
References
- ↑ "Cygnus – constellation boundary", The Constellations, International Astronomical Union, http://www.iau.org/public/constellations/#cyg, retrieved 2011-12-15
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 Kepler-28b, NASA Ames Research Center, http://kepler.nasa.gov/Mission/discoveries/kepler28b/, retrieved 2011-12-06
- ↑ "Kepler-28". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-28.
- ↑ McQuillan, A.; Mazeh, T.; Aigrain, S. (2013). "Stellar Rotation Periods of The Kepler objects of Interest: A Dearth of Close-In Planets Around Fast Rotators". The Astrophysical Journal Letters 775 (1): L11. doi:10.1088/2041-8205/775/1/L11. Bibcode: 2013ApJ...775L..11M.
- ↑ 6.0 6.1 Cubillos, Patricio; Erkaev, Nikolai V.; Juvan, Ines; Fossati, Luca; Johnstone, Colin P.; Lammer, Helmut; Lendl, Monika; Odert, Petra et al. (2016), "An overabundance of low-density Neptune-like planets", Monthly Notices of the Royal Astronomical Society 466 (2): 1868–1879, doi:10.1093/mnras/stw3103
- ↑ Steffen, Jason H.; Fabrycky, Daniel C.; Ford, Eric B.; Carter, Joshua A.; Desert, Jean-Michel; Fressin, Francois; Holman, Matthew J.; Lissauer, Jack J. et al. (2012), Transit Timing Observations from Kepler: III. Confirmation of 4 Multiple Planet Systems by a Fourier-Domain Study of Anti-correlated Transit Timing Variations, doi:10.1111/j.1365-2966.2012.20467.x, Bibcode: 2012MNRAS.421.2342S
- ↑ Schneider, Jean, Star: Kepler-28, http://exoplanet.eu/star.php?st=Kepler-28, retrieved 2011-12-06
Coordinates: 
19h 28m 32.887s, +42° 25′ 45.91″
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