97 citations · 651 across the 39 of their papers we have counts for
21 papers · 1 filter
Lunar Cold Trap Contamination by Landing Vehicles
Scott T. Shipley, John E. Lane, Philip T. Metzger
Tools have been developed to model and simulate the effects of lunar landing vehicles on the lunar environment, mostly addressing the effects of regolith erosion by rocket plumes a…
Thermal Extraction of Volatiles from Lunar and Asteroid Regolith in Axisymmetric Crank-Nicholson Modeling
Philip T. Metzger, Kris Zacny, Phillip Morrison
A physics-based computer model has been developed to support the development of volatile extraction from regolith of the Moon and asteroids. The model is based upon empirical data…
Modeling the Thermal Extraction of Water Ice from Regolith
Philip Metzger
Modeling has been developed to support the development of volatile extraction technologies for the Moon, Mars, asteroids, or other bodies. This type of modeling capability is impor…
Results of the 2015 Workshop on Asteroid Simulants
Philip T. Metzger, Daniel T. Britt, Stephen D. Covey +1
The first asteroid simulants workshop was held in late 2015. These materials are needed for tests of technologies and mission operational concepts, for training astronauts , for me…
Further Analysis on the Mystery of the Surveyor III Dust Deposits
John Lane, Steven Trigwell, Paul Hintze +1
The Apollo 12 lunar module (LM) landing near the Surveyor III spacecraft at the end of 1969 has remained the primary experimental verification of the predicted physics of plume eje…
Soil Test Apparatus for Lunar Surfaces
Laila A. Rahmatian, Philip T. Metzger
We have studied several field geotechnical test instruments for their applicability to lunar soil simulants and analog soils. Their performance was evaluated in a series of tests i…
Rocket Cratering in Simulated Lunar and Martian Environments
Christopher Immer, Philip Metzger
With NASA's planned return to the moon and possibly with lunar outposts being formed, repeated landings at the same site will be necessary. Understanding rocket plume interaction w…
The Physical State of Lunar Soil in the Permanently Shadowed Craters of the Moon
Jacob N. Gamsky, Philip T. Metzger
The physical state of the lunar soil in the permanently shadowed craters of the moon is inferred from experimental investigation. The permanently shadowed craters do not undergo th…
Lagrangian Trajectory Modeling of Lunar Dust Particles
John E. Lane, Philip T. Metzger, Christopher D. Immer +1
A mathematical model and software implementation developed to predict trajectories of single lunar dust particles acted on by a high velocity gas flow is discussed. The model uses…
The Damage to Lunar Orbiting Spacecraft Caused by the Ejecta of Lunar Landers
Philip T. Metzger, James G. Mantovani
This manuscript analyzes lunar lander soil erosion models and trajectory models to calculate how much damage will occur to spacecraft orbiting in the vicinity of the Moon. The soil…
Apollo Video Photogrammetry Estimation of Plume Impingement Effects (conference version)
Christopher Immer, John Lane, Philip Metzger +1
The Constellation Project's planned return to the moon requires numerous landings at the same site. Since the top few centimeters are loosely packed regolith, plume impingement fro…
Scaling of Erosion Rate in Subsonic Jet Experiments and Apollo Lunar Module Landings
Philip T. Metzger, John E. Lane, Christopher D. Immer +5
Small scale jet-induced erosion experiments are useful for identifying the scaling of erosion with respect to the various physical parameters (gravity, grain size, gas velocity, ga…
ISRU Implications for Lunar and Martian Plume Effects
Philip T. Metzger, Xiaoyi Li, Christopher D. Immer +1
Experiments, analyses, and simulations have shown that the engine exhaust plume of a Mars lander large enough for human spaceflight will create a deep crater in the martian soil, b…
Modification of Roberts' Theory for Rocket Exhaust Plumes Eroding Lunar Soil
Philip T. Metzger, John E. Lane, Christopher D. Immer
Roberts' model of lunar soil erosion beneath a landing rocket has been updated in several ways to predict the effects of future lunar landings. The model predicts, among other thin…
Cratering of Soil by Impinging Jets of Gas, with Application to Landing Rockets on Planetary Surfaces
Philip T. Metzger, Bruce T. Vu, D. E. Taylor +9
Several physical mechanisms are involved in excavating granular materials beneath a vertical jet of gas. These occur, for example, beneath the exhaust plume of a rocket landing on…
Empirical Scaling Laws of Rocket Exhaust Cratering
Carly M. Donohue, Philip T. Metzger, Christopher D. Immer
When launching or landing a spacecraft on the regolith of a terrestrial surface, special attention needs to be paid to the rocket exhaust cratering effects. If the effects are not…
Model for Asteroid Regolith to Guide Simulant Development
Philip T. Metzger, Daniel T. Britt
When creating asteroid regolith simulant, it is necessary to have a model of asteroid regolith to guide and to evaluate the simulant. We created a model through evaluation and synt…
Measuring the Fidelity of Asteroid Regolith and Cobble Simulants
Philip T. Metzger, Daniel T. Britt, Stephen Covey +5
NASA has developed a "Figure of Merit" method to grade the fidelity of lunar simulants for scientific and engineering purposes. Here we extend the method to grade asteroid simulant…
The Reclassification of Asteroids from Planets to Non-Planets
Philip T. Metzger, Mark V. Sykes, Alan Stern +1
It is often claimed that asteroids' sharing of orbits is the reason they were re-classified from planets to non-planets. A critical review of the literature from the 19th Century t…
Experiments Indicate Regolith is Looser in the Lunar Polar Regions than at the Lunar Landing Sites
Philip T. Metzger, Seamus Anderson, Anthony Colaprete
Since the Apollo program or earlier it has been widely believed that the lunar regolith was compacted through vibrations including nearby impact events, thermal stress release in t…
ASIME 2016 White Paper: In-Space Utilisation of Asteroids: "Answers to Questions from the Asteroid Miners"
Amara L. Graps, Philippe Blondel, Grant Bonin +28
The aim of the Asteroid Science Intersections with In-Space Mine Engineering (ASIME) 2016 conference on September 21-22, 2016 in Luxembourg City was to provide an environment for t…