Kepler-88
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lyra |
| Right ascension | +19h 24m 35.5431s[1] |
| Declination | +40° 40′ 09.8098″[1] |
| Apparent magnitude (V) | 13.5[2] |
| Characteristics | |
| Spectral type | G8IV or B[3] |
| Astrometry | |
| Proper motion (μ) | RA: 1.114±0.023[1] mas/yr Dec.: 4.963±0.028[1] mas/yr |
| Parallax (π) | 2.6246 ± 0.0140[1] mas |
| Distance | 1,243 ± 7 ly (381 ± 2 pc) |
| Absolute magnitude (MV) | 5.183+0.116 −0.090[4] |
| Details | |
| Mass | 1.022+0.023 −0.026[4] M☉ |
| Radius | 0.961+0.020 −0.024[4] R☉ |
| Luminosity | 0.755+0.056 −0.067[4] L☉ |
| Surface gravity (log g) | 4.482+0.018 −0.016[4] cgs |
| Temperature | 5513±67[4] K |
| Metallicity [Fe/H] | +0.37 ± 0.08[4] dex |
| Rotation | 30.689±0.383 days[5] |
| Age | 2.45+1.20 −0.77[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| KIC | data |
Kepler-88 is a Sun-like star in the constellation of Lyra, with three confirmed planets. In April 2012, scientists discovered that a Kepler candidate known as 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[]
 | This section needs additional citations for verification. (January 2018) |
Kepler-88 b is the inner most planet in the system and is Neptune-sized but almost half as dense.
Kepler 88 c is about 60% as massive as Jupiter but its radius is not known due to not transiting the planet.
Kepler-88 d orbits its star every four years, and its orbit is not circular, but elliptical. At three times the mass of Jupiter, it is the most massive.[8] It was discovered based on six years of radial velocity (RV) follow-up from the W. M. Keck Observatory High Resolution Echelle Spectrometer spectrograph.[9]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.09604+0.00063 −0.00066 MJ |
0.098 | 10.91647±0.00014 | 0.05561±0.00013 | 90.97±0.12° | 3.780 R
|