NTRS - NASA Technical Reports Server

Back to Results
Lighting Condition Analysis for Mars' Moon PhobosThis study used high fidelity computer simulation to investigate the lighting conditions, specifically the solar radiation flux over the surface, on Phobos. Ephemeris data from the Jet Propulsion Laboratory (JPL) DE405 model was used to model the state of the Sun, Earth, Moon, and Mars. An occultation model was developed to simulate Phobos' self-shadowing and its solar eclipses by Mars. The propagated Phobos state was compared with data from JPL's Horizon system to ensure the accuracy of the result. Results for Phobos lighting conditions over one Martian year are presented, which include the duration of solar eclipses, average solar radiation intensity, surface exposure time, and radiant exposure for both sun tracking and fixed solar arrays. The results show that: Phobos' solar eclipse time varies throughout the Martian year, with longer eclipse durations during the Martian northern spring and fall seasons and no eclipses during the Martian northern summer and winter seasons; solar radiation intensity is close to minimum in late spring and close to maximum in late fall; exposure time per orbit is relatively constant over the surface during the spring and fall but varies with latitude during the summer and winter; and Sun tracking solar arrays generate more energy than a fixed solar array. A usage example of the result is also present in this paper to demonstrate the utility.
Document ID
Document Type
Conference Paper
Li, Zu Qun (NASA Johnson Space Center Houston, TX, United States)
de Carufel, Guy (Odyssey Space Research, LLC Houston, TX, United States)
Crues, Edwin Z. (NASA Johnson Space Center Houston, TX, United States)
Bielski, Paul (NASA Johnson Space Center Houston, TX, United States)
Date Acquired
January 21, 2016
Publication Date
March 5, 2016
Subject Category
Energy Production and Conversion
Spacecraft Propulsion and Power
Solar Physics
Lunar and Planetary Science and Exploration
Report/Patent Number
Meeting Information
2016 (IEEE) Aerospace Conference(Big Sky, MT)
Distribution Limits
Public Use Permitted.

Available Downloads

NameType 20160001045.pdf STI

Related Records

IDRelationTitle20150019633See AlsoLighting Condition Analysis for Mars' Moon Phobos20170009413See AlsoLighting Condition Analysis for Mars' Moon Phobos20150013833See AlsoLighting Condition Analysis for Mars Moon Phobos20170009412See AlsoLighting Condition Analysis for Mars' Moon Phobos