Imaginary Picture of Kepler-28 b

Display orbital revolution of Kepler-28 b around the hoststar Kepler-28
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Exoplanet Name : Kepler-28 b
Alternate Name : "2MASS J19283288+4225459 b, K00870.01, KIC 6949607 b, KOI-870 b, KOI-870.01, WISE J192832.88+422546.0 b"
Status : Confirmed
Radius (Rjup / Re): 0.3210 (Rjup) 3.5981 (Rearth)
Mass (Mjup / Me): 1.5100 (Mjup) 480.0864 (Mearth)
Semi Major Axis / Orbital Distance Calculated 0.0620 (AU) 0.0620 (AU Est.)
Eccentricity : 0.0000
Orbital Period(Yrs) 0.0162
Orbital Period(Observed/Estimated) 5.91 (Days Obs.) 6.51 (Days Est.)
Surface Gravity (G Earth) 37.0831
Star Radiation at Atmospheric Boundary: 64130.7 (W/m2)
Measured Temperature (K) 0.0 (K)
Blackbody T 0.1(K) 710.2 (K)
Blackbody T 0.3(K) 667.0 (K)
Blackbody T 0.7(K) 539.7 (K)
Tidally Locked Blackbody T 0.1(K) 844.6 (K)
Tidally Locked Blackbody T 0.3(K) 793.2 (K)
Size Class: Neptune-size
Mass Class:
Detection Type : Primary Transit
Mass Detection :
Radius Detection :
Habitability by Solar Eq. Astronomical Unit: Not habitable
Habitability by Kopparapu: Not habitable
Star Name : Kepler-28
Alternate Name : "2MASS J19283288+4225459, KIC 6949607, KOI-870, WISE J192832.88+422546.0"
Star Distance(LY) : 1429.3
Stellar Radius(Rsun) : 0.6 (Rsun Measured)
Stellar Mass(Msun) : 0.8 (Msun Measured) 0.9 (Msun Estimated)
Star Age : 0.0 (GY)
Temperature : 4674 (K)
Spectral type : M0 V
UV portion[%]: 2.1
Visible portion[%]: 33.8
IR portion[%]: 64.1
Metalicity : 0.3
Absolute Magnitude: 7.3
Apparent Magnitude: 15.5
Right Ascension(RA) 292.1370
Declination (DEC) 42.4294
Hubble Space Telescope Guide Star Catalog (GSC) ID
Discovered by
Discovery Paper - Authors "Jason H. Ste_en, Daniel C. Fabrycky, Eric B. Ford, Joshua A. Carter, Jean-Michel D¥¹¡£¥¹¥åesert, Francois Fressin, Matthew J. Holman, Jack J. Lissauer, Althea V. Moorhead, Jason F. Rowe, Darin Ragozzine, William F. Welsh, Natalie M. Batalha, William J. Borucki, Lars A. Buchhave, Steve Bryson, Douglas A. Caldwell, David Charbonneau, David R. Ciardi, William D. Cochran, Michael Endl, Mark E. Everett, Thomas N. Gautier, Ron L. Gilliland, Forrest R. Girouard, Jon M. Jenkins, Elliott Horch, Steve B. Howell, Howard Isaacson , Todd C. Klaus, David G. Koch, David W. Latham, Jie Li, Philip Lucas, Phillip J. MacQueen, Geo_rey W. Marcy, Sean McCauli_, Christopher K. Middour, Robert L. Morris, Fergal R. Mullally, Samuel N. Quinn, Elisa V. Quintana, Avi Shporer, Martin Still1, Peter Tenenbaum, Susan E. Thompson, Joseph D. Twicken, Je_ery Van Cleve"
Discovery Paper - Title Transit Timing Observations from Kepler: III. Con_rmation of 4 Multiple Planet Systems by a Fourier-Domain Study of Anti-correlated Transit Timing Variations
Discovery Paper - Journal "Mon. Not. R. Astron. Soc. 000, 2_14 (0000) Printed 27 January 2012 (MN LATEX style file v2.2)"
Discovery Paper - URL https://arxiv.org/pdf/1201.5412v1.pdf
SIMBAD LINK http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Kepler-28+&submit=SIMBAD+search
Open Exoplanet Database Link http://www.openexoplanetcatalogue.com/planet/Kepler-28%20b/
Kepler-28 b
Kepler-28 b
  • Kepler-28 b is an exoplanet orbiting the star Kepler-28, located about 1429.3 light-years (438.2 pc) away from Solar System. Its discovery was publicly announced on 2011.
  • The host star Kepler-28 has apparent magnitude of 15.5, with absolute magnitude of 7.3.
  • It is 0.8 times more massive and 0.6 times bigger compared with our Sun. The surface temperature is 4674 with its spectral types of M0 V
  • In this planetary system, the extrasolar planet Kepler-28 b orbits around the star Kepler-28 every 5.9 days with its orbital distance of 0.06 AU ( 9275068.0 km)
    • (Projected orbit of Kepler-28 b around its host star Kepler-28)


  • The Star Kepler-28 's habitable zone is located at the following distance
  • Inner Boundary (the orbital distance at Venus's Equivalent Radiation ) : 0.307 AU ( 45949440.3 km)
  • Earth Boundary (the orbital distance at Earth's Equivalent Radiation) : 0.425 AU ( 63514134.5 km)
  • Outer Boundary (the orbital distance at Mars's Equivalent Radiation) : 0.647 AU ( 96781485.3 km)
  • Snow Line (the orbital distance at Snow Line Equivalent Radiation) : 0.952 AU ( 142418195.3 km)
  • Radiation at Planetary Boundary of Kepler-28 b : 64130.65 W/m2

    (Habitable zone calculated based on SEAU(Solar Equivalent Astronomical Unit) around the star Kepler-28)



  • Kopparapu Recent Venus for Star Kepler-28 distance : 0.337 AU
  • Kopparapu Runaway Greenhouse for Earth-sized planet for Star Kepler-28 distance : 0.427 AU
  • Kopparapu Runaway Greenhouse for Super-Earth-sized planet for Star Kepler-28 distance : 0.412 AU
  • Kopparapu Runaway Greenhouse for Mars-sized planet for Star Kepler-28 distance : 0.453 AU
  • Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-28 distance : 0.784 AU
  • Kopparapu Outer Boundary for Early Mars for Star Kepler-28 distance : 0.827 AU

    (Habitable zone calculated based on Kopparapu et al.(2013) around the star Kepler-28)



  • Original Kopparapu Recent Venus for Star Kepler-28 distance : 0.333 AU
  • Original Kopparapu Runaway Greenhouse for Star Kepler-28 distance : 0.440 AU
  • Original Kopparapu Moist Greenhouse for Star Kepler-28 distance : 0.440 AU
  • Original Kopparapu Outer Boundary for Maximum Greenhouse for Star Kepler-28 distance : 0.797 AU
  • Original Kopparapu Outer Boundary for Early Mars for Star Kepler-28 distance : 0.829 AU

    (Habitable zone calculated based on Kopparapu et al.(Original) around the star Kepler-28)



    (Position in Stellar Map of star Kepler-28 and its Exoplanet Kepler-28 b)



    (Zoomed position in Stellar Map of star Kepler-28 and its Exoplanet Kepler-28 b (zoom level 3))

    (Synthetic Spectrum of star Kepler-28*)
    *Yamashiki YA et al. 2019 ApJ 881 114
    MUSCLES Paper I - France et al. 2016 ApJ 820 89
    MUSCLES Paper II- Youngblood et al. 2016 ApJ 824 101
    MUSCLES Paper III- Loyd et al. 2016 ApJ 824 102