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written by Richard McCray and Andrew Koelemay
This applet demonstrates how astronomers measure the properties of extra-solar planets by detecting planetary transits and eclipses. The applet shows a planet in orbit around a star. A graph plots the total brightness of the star as the planet orbits around it. The user can control the star's radius, the star's temperature, the planet's radius, the orbital radius and the albedo. The user can also see how the spectrum of the illuminated side of the planet, due to both the reflected starlight and the emitted planetary radiation, dependes on wavelength, albedo, and the parameters of the system.

This is part of a larger collection of applets by STEM Colorado focused mostly on topics in astronomy.

Please note that this resource requires at least version 1.4.2_06 of Java.
Subjects Levels Resource Types
- Exoplanets
= Detection Methods
- Fundamentals
= Celestial Mechanics
- Lower Undergraduate
- High School
- Upper Undergraduate
- Instructional Material
= Activity
= Interactive Simulation
Intended Users Formats Ratings
- Learners
- Educators
- application/java
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Access Rights:
Free access
© 2004 Richard McCray
exoplanet, extrasolar planet, planet detection methods, planetary transit
Record Cloner:
Metadata instance created August 29, 2008 by Alea Smith
Record Updated:
January 14, 2011 by Lyle Barbato
Last Update
when Cataloged:
August 29, 2008
Other Collections:

ComPADRE is beta testing Citation Styles!

Record Link
AIP Format
R. McCray and A. Koelemay, (2004), WWW Document, (
R. McCray and A. Koelemay, STEM Colorado: Planetary Transits, (2004), <>.
APA Format
McCray, R., & Koelemay, A. (2008, August 29). STEM Colorado: Planetary Transits. Retrieved April 5, 2020, from
Chicago Format
McCray, Richard, and Andrew Koelemay. STEM Colorado: Planetary Transits. August 29, 2008. (accessed 5 April 2020).
MLA Format
McCray, Richard, and Andrew Koelemay. STEM Colorado: Planetary Transits. 2004. 29 Aug. 2008. 5 Apr. 2020 <>.
BibTeX Export Format
@misc{ Author = "Richard McCray and Andrew Koelemay", Title = {STEM Colorado: Planetary Transits}, Volume = {2020}, Number = {5 April 2020}, Month = {August 29, 2008}, Year = {2004} }
Refer Export Format

%A Richard McCray
%A Andrew Koelemay
%T STEM Colorado: Planetary Transits
%D August 29, 2008
%O application/java

EndNote Export Format

%0 Electronic Source
%A McCray, Richard
%A Koelemay, Andrew
%D August 29, 2008
%T STEM Colorado: Planetary Transits
%V 2020
%N 5 April 2020
%8 August 29, 2008
%9 application/java

Disclaimer: ComPADRE offers citation styles as a guide only. We cannot offer interpretations about citations as this is an automated procedure. Please refer to the style manuals in the Citation Source Information area for clarifications.

Citation Source Information

The AIP Style presented is based on information from the AIP Style Manual.

The APA Style presented is based on information from APA Electronic References.

The Chicago Style presented is based on information from Examples of Chicago-Style Documentation.

The MLA Style presented is based on information from the MLA FAQ.

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