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Observation data
Epoch       Equinox
Constellation Lyra
Right ascension +19h 24m 35.541s[1]
Declination +40° 40′ 9.85″[1]
Apparent magnitude (V) 13.5[2]
Spectral type B[2]
Proper motion (μ) RA: 2.0[3] mas/yr
Dec.: 8.5[3] mas/yr
[4] pc)
Absolute magnitude (MV)5.183+0.116
[4] M
[4] R
[4] L
Surface gravity (log g)4.482+0.018
[4] cgs
Temperature5513 ± 67[4] K
Metallicity [Fe/H]+0.37 ± 0.08[4] dex
Rotation30.689±0.383 days[5]
[4] Gyr
Other designations
KOI-142, KIC 5446285, 2MASS J19243554+4040098[6]
Database references

Kepler-88 is a Sun-like star in the constellation of Lyra, with two confirmed planets. In April 2012, scientists discovered that a Kepler candidate KOI-142.01 (Kepler-88b) exhibited very significant transit-timing variations caused by a non-transiting planet.[4] Timing variations were large enough to cause changes to transit durations to Kepler-88b as well. Large transit-timing variations helped to put tight constraints to masses of both planets. The non-transiting planet was further confirmed through the radial velocity method in November 2013.[7]

Planetary system[edit]

Kepler-88's inner planet is Neptune-sized but almost half as dense. The outer planet is about 60% as massive as Jupiter but its radius is not known due to not transiting the planet.

The Kepler-88 planetary system
(in order from star)
Mass Semimajor axis
Orbital period
Eccentricity Inclination Radius
b 8.70 M 0.098 ~10.95416 0.056 89.055° 3.780 R
c 0.626 MJ 0.15525 22.3395 0.056 86.2°


  1. ^ a b Cutri, R. M. (2003). "2MASS All-Sky Catalog of Point Sources". VizieR On-line Data Catalog. 2246. Bibcode:2003yCat.2246....0C. 
  2. ^ a b "Notes on Kepler-88 b". Retrieved 14 January 2018. 
  3. ^ a b Kepler Mission Team (2009). "VizieR Online Data Catalog: Kepler Input Catalog". VizieR On-line Data Catalog. 5133. Bibcode:2009yCat.5133....0K. 
  4. ^ a b c d e f g h i j Nesvorný, David; Kipping, David; Terrell, Dirk; Hartman, Joel; Bakos, Gáspár Á; Buchhave, Lars A (2013). "KOI-142, the King of Transit Variations, is a Pair of Planets Near the 2:1 Resonance". The Astrophysical Journal. 777: 3. arXiv:1304.4283Freely accessible. Bibcode:2013ApJ...777....3N. doi:10.1088/0004-637X/777/1/3. 
  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:1308.1845Freely accessible. Bibcode:2013ApJ...775L..11M. doi:10.1088/2041-8205/775/1/L11. 
  6. ^ "Kepler-88". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 14 January 2017. 
  7. ^ SOPHIE velocimetry of kepler transit candidates:X KOI-142c: first radial velocity confirmation of a non-transiting exoplanet discovered by transit timing: S.C.C. Barros (1), R. F. Diaz, A. Santerne, G. Bruno, M. Deleuil, J.M. Almenara, A.S. Bonomo, F. Bouchy, C. Damiani, G. Hebrard, G. Montagnier, C. Moutou (1- Laboratoire d'astrophysique de Marseille)2