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Observation data
Epoch       Equinox
Constellation Lyra
Right ascension +19:24:35.54
Declination +40:40:9.87
Apparent magnitude (V) 13.113
Distance 1105 ly
(339 pc)
Mass 0.96 M
Radius 0.88 R
Temperature 5471 K
Metallicity [Fe/H] +0.2 dex
Age 3.9 ± 0.3 Gyr
Other designations

Kepler-88 is a Sun-like star 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.[1] 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.[2]

Planetary system

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. KOI-142, the King of Transit Variations, is a Pair of Planets near the 2:1 Resonance: David Nesvorný, David Kipping, Dirk Terrell, Joel Hartman, Gaspar A. Bakos, Lars A. Buchhave. 15 April 2013
  2. 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