Kepler-28
Observation data
Epoch J2000      Equinox J2000
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 mas[2]
Distance1,450 ± 20 ly
(444 ± 5 pc)
Details
Mass0.75[3] M☉
Radius0.70[3] R☉
Luminosity[3] L☉
Temperature4590[3] K
Metallicity [Fe/H]0.34[3] dex
Rotation17.951±0.016 days[5]
Rotational velocity (v sin i)0.6[3] km/s
Other designations
KOI-870, KIC 6949607, 2MASS J19283288+4225459, Gaia DR2 2125731464014361088
Database references
SIMBADdata
KICdata

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]

The Kepler-28 planetary system[8][6]
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

  1. ^ "Cygnus – constellation boundary", The Constellations, International Astronomical Union, retrieved 2011-12-15
  2. ^ a b c d e f 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 DR2 record for this source at VizieR.
  3. ^ a b c d e f g h Kepler-28b, NASA Ames Research Center, archived from the original on 2012-05-03, retrieved 2011-12-06
  4. ^ "Kepler-28". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 10 January 2017.
  5. ^ 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. arXiv:1308.1845. Bibcode:2013ApJ...775L..11M. doi:10.1088/2041-8205/775/1/L11.
  6. ^ a b Cubillos, Patricio; Erkaev, Nikolai V.; Juvan, Ines; Fossati, Luca; Johnstone, Colin P.; Lammer, Helmut; Lendl, Monika; Odert, Petra; Kislyakova, Kristina G. (2016), "An overabundance of low-density Neptune-like planets", Monthly Notices of the Royal Astronomical Society, 466 (2): 1868–1879, arXiv:1611.09236, doi:10.1093/mnras/stw3103, S2CID 119408956
  7. ^ Steffen, Jason H.; Fabrycky, Daniel C.; Ford, Eric B.; Carter, Joshua A.; Desert, Jean-Michel; Fressin, Francois; Holman, Matthew J.; Lissauer, Jack J.; Moorhead, Althea V.; Rowe, Jason F.; Ragozzine, Darin; Welsh, William F.; Batalha, Natalie M.; Borucki, William J.; Buchhave, Lars A.; Bryson, Steve; Caldwell, Douglas A.; Charbonneau, David; Ciardi, David R.; Cochran, William D.; Endl, Michael; Everett, Mark E.; Gautier III, Thomas N.; Gilliland, Ron L.; Girouard, Forrest R.; Jenkins, Jon M.; Horch, Elliott; Howell, Steve B.; Isaacson, Howard; 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, arXiv:1201.5412, Bibcode:2012MNRAS.421.2342S, doi:10.1111/j.1365-2966.2012.20467.x, S2CID 11898578
  8. ^ Schneider, Jean, "Star: Kepler-28", Extrasolar Planets Encyclopaedia, archived from the original on 2012-04-26, retrieved 2011-12-06


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