Engineering topics
Chodas, P.
Publications and source records attributed to Chodas, P..
The Impact of a Large Object on Jupiter in 2009 July
On 2009 July 19, we observed a single, large impact on Jupiter at a planetocentric latitude of 55 S. This and the Shoemaker-Levy 9 (SL9) impacts on Jupiter in 1994 are the only planetary-scale impacts ever observed. The 2009 impact had an entry trajectory in the opposite direction and with a Tower incidence angle than that of SL9. Comparison of the initial aerosol cloud debris properties, spanning 4800 km east west and 2500 km north south, with those produced by the SL9 fragments and dynamical calculations of pre-impact orbit indicates that the impactor was most probably an icy body with a size of 0.5-1 km. The collision rate of events of this magnitude may be five to ten times more frequent than previously thought. The search for unpredicted impacts, such as the current one, could be best performed in 890 nm and K (2.03--2.36 micrometer) filters in strong gaseous absorption, where the high-altitude aerosols are more reflective than Jupiter's primary clouds.
Quantifying the risk posed by potential Earth impacts
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Radar observations and physical model of asteroid 6489 Golevka
We report 8510-MHz (3,5-cm) radar observations of the Earth crossing asteroid (ECA) 6489 Golevka (1991 JX) obtained between June 3 and June 15, 1995, at Goldstone, the Very Large Array and the Evpatoria (Ukraine) and Kashima (Japan) radio antennas.
Off-Earth Sites and Asteroid/Comet Orbital Uncertainties: Extensions to the Horizons on-Line Ephemeris and Data System
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Orbit Uncertainies, Keyholes, and Collision Probabilities
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Orbit Uncertainties, Keyholes, and Collision Probabilities
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NASA's Near-Earth Object Office
Near-Earth Objects (NEOs) are scientifically interesting remnants of the early solar system formation process, accessible resources for the raw materials necessary for colonizing the inner solar system in the next century, and objects that can threaten life on Earth.
Predicting Close Approaches and Estimating Impact Probabilities for Near Earth Objects
Recent popular movies have raised public consciousness of the very real possibility of a comet or asteroid collision with the Earth.
Orbit Determination and Estimation of Impact Probability for Near Earth Objects
Near-Earth Objects (NEOs) are asteroids and comets that have been nudged by the gravitational attraction of nearby planets into orbits that allow them to enter the Earth's neighborhood.
Radar and Optical Observations of Asteroid 1998 KY26
Observations of near-Earth asteroid 1998 KY26 shortly after its discovery reveal a slightly elongated spheroid with a diameter of about 30 m, a composition analogous to carbonaceous chondritic meteorites, and a rotation period of 10.7 minutes, which is an order of magnitude shorter that that measured for any other solar system object.
Radar Observations of Asteroid 1998KY26
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The Orbit of Comet Shoemaker-Levy 9 about Jupiter
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Backward Integration of a SL9 Type Comet
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Periodic Comet Shoemaker-Levy 9 (1993e)
Jupiter will be bombarded by the debris of P/Shoemaker-Levy 9 that populated the comet's west-southwestern trail.
Stereo Processing of Magellan Sar Imagery Performed on Transputer Architecture
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