Thomas Johnson
Goddard Space Flight Center
12 Papers
98 Citations
Thomas Johnson is an academic researcher from Goddard Space Flight Center. The author has contributed to research in topics: James Webb Space Telescope & Spectrograph. The author has an hindex of 6, co-authored 12 publications.
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Papers
Polar Motion from Laser Tracking of Artificial Satellites
TL;DR: Measurements of the range to the Beacon Explorer C spacecraft from a single laser tracking system at Goddard Space Flight Center have been used to determine the change in latitude of the station arising from polar motion.
Laser Beam Directed at the Lunar Retro-Reflector Array: Observations of the First Returns
James E. Faller,Irvin Winer,Walter J. Carrion,Thomas Johnson,Paul L. Spadin,Lloyd B. Robinson,E. Joseph Wampler,Donald Wieber +7 more
TL;DR: Return signals from an optical retro-reflector array placed on the moon by the Apollo 11 astronauts were successfully detected with the Lick Observatory and a laser, and it was found that each return signal averaged more than one photoelectron.
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Detector arrays for the James Webb Space Telescope near-infrared spectrograph
Bernard J. Rauscher,David Alexander,C. Brambora,Rebecca J. Derro,Chuck Engler,Ori Fox,Ori Fox,Matthew B. Garrison,Greg Henegar,Robert J. Hill,Thomas Johnson,Don J. Lindler,Sridhar S. Manthripragada,Cheryl J. Marshall,Brent Mott,Thomas M. Parr,Wayne D. Roher,Kamdin B. Shakoorzadeh,Kamdin B. Shakoorzadeh,Miles Smith,Augustyn Waczynski,Yiting Wen,Donna Wilson,Wei Xia-Serafino,Craig A. Cabelli,Edward Cheng,James D. Garnett,Markus Loose,Majid Zandian,Joseph Zino,Tim Ellis,Bryan Howe,Mirium Jurado,Ginn Lee,John Nieznanski,Peter Wallis,James York,Michael W. Regan,Georgio Bagnasco,Torsten Böker,Guido De Marchi,Pierre Ferruit,Peter Jakobsen,Paolo Strada +43 more
TL;DR: The James Webb Space Telescope's (JWST) Near Infrared Spectrograph (NIRSpec) incorporates two 5 micron cutoff (lambda(sub co) = 5 microns) 2048x2048 pixel Teledyne HgCdTe HAWAII-2RG sensor chip assemblies as discussed by the authors.
2.5a - A laser satellite ranging system - Part I: Equipment description
TL;DR: In this paper, a laser tracking system was used to track three satellites equipped with retroreflectors, and an rms scatter of one to two meters derived from 200-200 observations per pass agreed with the expected instrumental precision.
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JWST Near-Infrared Detectors: Latest Test Results
Erin C. Smith,Bernard J. Rauscher,David Alexander,Brian L. Clemons,Chuck Engler,Matthew B. Garrison,Robert J. Hill,Thomas Johnson,Don J. Lindler,Sridhar S. Manthripragada,Cheryl J. Marshall,Brent Mott,Thomas M. Parr,Wayne D. Roher,Kamdin B. Shakoorzadeh,Richard Schnurr,Augustyn Waczynski,Yiting Wen,Donna Wilson,Markus Loose,Giorgio Bagnasco,Torsten Böker,Guido De Marchi,P. Ferruit,Peter Jakobsen,Paolo Strada +25 more
TL;DR: In this article, the authors present test and calibration results for the NIRSpec flight arrays as well as data processing routines for noise reduction and cosmic ray rejection for the JWST's near infrared spectrograph.