Kepler-28

Kepler-28
Observation data; Equinox J2000.0]] (ICRS)
Constellation	Cygnus
Right ascension	19h 28m 32.8905s
Declination	+42° 25′ 45.959″
Apparent magnitude (V)	15.306
Characteristics
Spectral type	M0V
Astrometry
Proper motion (μ)	RA: −0.488±0.042 mas/yr ; Dec.: 11.692±0.042 mas/yr
Parallax (π)	2.2527 ± 0.0241 mas
Distance	1,450 ± 20 ly ; (444 ± 5 pc)
Details
Mass	0.75 M☉
Radius	0.70 R☉
Luminosity	L☉
Temperature	4590 K
Metallicity [Fe/H]	0.34 dex
Rotation	17.951±0.016 days
Rotational velocity (v sin i)	0.6 km/s
Other designations
	KOI-870, KIC 6949607, 2MASS J19283288+4225459, Gaia DR2 2125731464014361088
Database references
SIMBAD	data
KIC	data

Short description: Star in the constellation Cygnus

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 19^h 28^m 32.8905^s, 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

↑ "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: 19^h 28^m 32.887^s, +42° 25′ 45.91″

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Original source: https://en.wikipedia.org/wiki/Kepler-28. Read more

[IAU_const-1] "Cygnus – constellation boundary", The Constellations, International Astronomical Union, http://www.iau.org/public/constellations/#cyg, retrieved 2011-12-15

[Gaia_DR2-2] 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.

[nasa_ames-3] 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

[4] "Kepler-28". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-28.

[McQuillan2013-5] 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. doi:10.1088/2041-8205/775/1/L11. Bibcode: 2013ApJ...775L..11M.

[Cubillos2016-6] 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

[7] 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

[epe-8] Schneider, Jean, Star: Kepler-28, http://exoplanet.eu/star.php?st=Kepler-28, retrieved 2011-12-06

Observation data Equinox J2000.0]] (ICRS)
Constellation	Cygnus^[1]
Right ascension	19^h 28^m 32.8905^s^[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
KOI-870, KIC 6949607, 2MASS J19283288+4225459, Gaia DR2 2125731464014361088
Database references
SIMBAD	data
KIC	data