Target 01
Kepler-10 b
Super Earth
- Planet radius
- 1.47 R⊕
- Star radius
- 1.06 R☉
- Orbital period
- 0.84 days
- Discovery
- 2011
A hot rocky world and one of the first confirmed terrestrial planets discovered by Kepler.
ExoSim
Exoplanet Transit Lab
Live system
00Quick guide
Run your first observation
Quick guide
Run your first observation
01
Choose a system
Use the default system, adjust it manually, or load a confirmed planet from the NASA library.
02
Set the geometry
Change the planet, star, inclination, and telescope noise from Mission Controls.
03
Observe the transit
Watch the planet cross the star. Pause, reset, or change the orbital speed when needed.
04
Read the signal
Compare the live brightness dip with the calculated transit depth and Science section.
01
Observation deck
Orbital view
Watch the system from a live station window as the planet crosses the stellar disk.
Visual feed 01
Orbit speed1.0×
Target
EXO-001
Phase
0.000
Inclination
90°
State
RUNNING
03
Photometry stream
Live light curve
The theoretical model and simulated telescope measurements remain synchronized with the orbit.
Receiving
Observed flux
100.0042%
Noise floor
50 ppm
Detection state
Baseline stable
04
NASA Exoplanet ArchiveNASA archive
Confirmed planetary systems
Load published planetary and stellar measurements into the simulator and compare the signals produced by different systems.
Target 02
Kepler-186 f
Super Earth
- Planet radius
- 1.17 R⊕
- Star radius
- 0.52 R☉
- Orbital period
- 129.9 days
- Discovery
- 2014
An Earth-sized world orbiting within the habitable zone of a cool red dwarf star.
Target 03
Kepler-20 e
Terrestrial
- Planet radius
- 0.82 R⊕
- Star radius
- 0.94 R☉
- Orbital period
- 6.1 days
- Discovery
- 2011
A small, intensely heated rocky planet orbiting close to its Sun-like host star.
Radius values are rounded from published archive measurements. Systems load at a standardized edge-on angle so their predicted transits can be compared clearly.
05
Signal model
The science behind the transit
A planet blocks part of the star's visible surface. The lost light depends mainly on the planet's radius compared with its host star.
Current geometry
Full transit
Transit-depth equation
ΔF / F = (Rₚ / R★)²
ΔF / F is the fraction of starlight lost during transit.
Rₚ is the planet radius and R★ is the stellar radius.
The ratio is squared because blocked light depends on circular area—not only the apparent width of the planet.
Live calculation
- Planet radius
- 1.0 R⊕
- Star radius
- 1.0 R☉
- Radius ratio
- 0.00917
- Maximum depth
- 0.0084%
- Orbit inclination
- 90°
Observable signal
0.0084%
Inclination determines whether the planet fully crosses, grazes, or misses the visible stellar surface.
A
Edge-on orbit
Near 90°, the planet crosses the stellar disk and produces the strongest transit signal.
B
Grazing orbit
The planet covers only the edge of the star, creating a shallower brightness dip.
C
Missed transit
At lower inclinations, the planet passes above or below the star and no transit is detected.