Multi-planet system
Kepler-90
Eight known planets — first system to tie our solar system's count.
- Planets
- 8
- Distance
- 2766.6 ly
- Host
- G-type
About Kepler-90
Discovery
Kepler-90 was identified by the Kepler mission with seven transiting planets; an eighth, Kepler-90 i, was uncovered in 2017 by Christopher Shallue and Andrew Vanderburg using a neural-network search of archival Kepler photometry.
Why it matters
Kepler-90 was the first exoplanet system found to match the Solar System's count of eight planets — and Kepler-90 i was the first exoplanet discovered with the help of deep learning, opening a new methodology for transit searches.
Current research
The system continues to anchor machine-learning rediscovery efforts in Kepler and TESS data; ground-based RV characterization is limited by the host star's faintness.
Comparable to
Like the Solar System scrunched inward — eight planets, all closer to their star than Earth is to the Sun.
System geometry
At a glance
- Hostname
- KOI-351
- Spectral type
- G2V
- Distance
- 2766.6 ly · 848.25 pc
- Stellar mass
- 1.20 M☉
- Stellar radius
- 1.20 R☉
- Luminosity
- 1.856 L☉
- Effective temp
- 6080 K
- Confirmed planets
- 8
- Habitable zone
- 1.294 – 1.866 AU
Top-down orbital diagram
Orbits to scale within this system. Dashed green = habitable-zone edges.
Planet positions are illustrative (evenly spaced in phase). For live motion see the 3D scene.
The planets
8 confirmed.
Rocky world
KOI-351 b
- Orbit
- 0.074 AU
- Period
- 7.01 days
- Radius
- 1.31 R⊕
- Mass
- 2.27 M⊕
- Eq. temperature
- 1062 K
- Eccentricity
- 0.000
- Discovered
- 2013 · Transit
Rocky world
KOI-351 c
- Orbit
- 0.089 AU
- Period
- 8.72 days
- Radius
- 1.19 R⊕
- Mass
- 1.81 M⊕
- Eq. temperature
- 987 K
- Eccentricity
- 0.000
- Discovered
- 2013 · Transit
Rocky world
Kepler-90 i
- Orbit
- 0.120 AU
- Period
- 14.45 days
- Radius
- 1.32 R⊕
- Mass
- 2.30 M⊕
- Eq. temperature
- 709 K
- Eccentricity
- 0.000
- Discovered
- 2017 · Transit
Sub-Neptune
KOI-351 d
- Orbit
- 0.320 AU
- Period
- 59.74 days
- Radius
- 2.87 R⊕
- Mass
- 8.60 M⊕
- Eq. temperature
- 520 K
- Eccentricity
- 0.000
- Discovered
- 2013 · Transit
Sub-Neptune
KOI-351 e
- Orbit
- 0.420 AU
- Period
- 91.94 days
- Radius
- 2.66 R⊕
- Mass
- 7.56 M⊕
- Eq. temperature
- 450 K
- Eccentricity
- 0.000
- Discovered
- 2013 · Transit
Sub-Neptune
KOI-351 f
- Orbit
- 0.480 AU
- Period
- 124.91 days
- Radius
- 2.88 R⊕
- Mass
- 8.65 M⊕
- Eq. temperature
- 407 K
- Eccentricity
- 0.000
- Discovered
- 2013 · Transit
Gas giant
KOI-351 g
- Orbit
- 0.717 AU
- Period
- 210.74 days
- Radius
- 7.72 R⊕
- Mass
- 15.00 M⊕
- Eq. temperature
- 342 K
- Eccentricity
- 0.029
- Discovered
- 2013 · Transit
Gas giant
KOI-351 h
- Orbit
- 0.971 AU
- Period
- 331.60 days
- Radius
- 11.25 R⊕
- Mass
- 203.00 M⊕
- Eq. temperature
- 294 K
- Eccentricity
- 0.028
- Discovered
- 2013 · Transit
Compared to our Solar System
Each row shows the closest Solar-System analog by radius (log-space). Earth is pinned at the bottom as the constant frame of reference.
| Planet | Radius (R⊕) | Mass (M⊕) | Orbit (AU) | Period (days) | Eq temp (K) | Solar analog |
|---|---|---|---|---|---|---|
| KOI-351 b | 1.31 | 2.27 | 0.074 | 7.01 | 1062 | Earth |
| KOI-351 c | 1.19 | 1.81 | 0.089 | 8.72 | 987 | Earth |
| Kepler-90 i | 1.32 | 2.30 | 0.120 | 14.45 | 709 | Earth |
| KOI-351 d | 2.87 | 8.60 | 0.320 | 59.74 | 520 | Neptune |
| KOI-351 e | 2.66 | 7.56 | 0.420 | 91.94 | 450 | Neptune |
| KOI-351 f | 2.88 | 8.65 | 0.480 | 124.91 | 407 | Neptune |
| KOI-351 g | 7.72 | 15.00 | 0.717 | 210.74 | 342 | Saturn |
| KOI-351 h | 11.25 | 203.00 | 0.971 | 331.60 | 294 | Jupiter |
| Earth (reference) | 1.00 | 1.00 | 1.000 | 365.25 | 255 | — |
Research status
◇ JWST observation status
No JWST programs are currently targeting planets in this system. The system may be observed in future cycles or by upcoming missions (Ariel, HWO, Roman).
Discovery timeline
- 2013
7 planets: b, c, d, e, f, g, h
via Transit
- 2017
Kepler-90 i
via Transit
If you liked this
Other systems in the same theme:
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HR 8799
4 planets · 134.5 ly · A5
Four giant planets directly imaged at infrared — orbiting a young A-type star.
Kepler-11
6 planets · 2108.1 ly · G2V
Six tightly packed planets — all closer to their star than Mercury is to ours.
Experience it
See Kepler-90 in interactive 3D
Fly through the system, click any planet, watch orbits play out at 100× speed.
▶ Launch 3D scene