Zobrazeno 1 - 10
of 31
pro vyhledávání: '"John H. Goebel"'
Autor:
John H. Goebel
Publikováno v:
Publications of the Astronomical Society of the Pacific. 119:483-493
The Gravity Probe B (GP-B) satellite photometric system and instrumentation are introduced. Observational results are presented for calibration stars demonstrating a single-orbit relative photometric precision capability of 500 μmag for bright stars
Autor:
M.T. Sullivan, Paul Ehrensberger, E. Romero, Murzy D. Jhabvala, S. Babu, D. Gill, N. Das, R. P. Farley, H. P. Demroff, D.B. DeBra, A. Kashani, M. R. Bye, K. L. Coleman, John H. Goebel
Publikováno v:
Le Journal de Physique IV. :Pr3-175
The pointing and stability requirements for the Gravity Probe B (GP-B) Relativity Mission pose a number of challenges for the star-tracking electronics. Because the telescope-gyroscope assembly operates at 2.8 K, the detector circuit's Si JFETs at th
Autor:
John A. Lipa, P. F. Schweiger, R. J. Bernier, R. P. Farley, L. W. Huff, D.E. Davidson, E. B. Acworth, Suwen Wang, J. P. Turneaure, K. Triebes, K. A. Bower, John H. Goebel, Dz-Hung Gwo
Publikováno v:
Classical and Quantum Gravity. 32:224008
The Gravity Probe B spacecraft was launched on 20 April 2004 to measure the geodetic and frame-dragging effects predicted by the theory of general relativity. A cryogenic optical telescope was used to establish the inertial reference frame for the me
Autor:
Craig R. McCreight, John H. Goebel
Publikováno v:
Applied optics. 20(18)
Low-background tests of a 1 x 32 Si:Bi charge-injection-device (CID) IR detector array were carried out to evaluate its feasibility for space-based astronomical observations. Optimum performance was obtained at a temperature of 11 K. The device showe
Publikováno v:
SPIE Proceedings.
The Wide-field Infrared Survey Explorer (WISE) is a NASA MidEx mission which will survey the entire sky at 3.3, 4.7, 12 and 23 microns. As with most all-sky surveys, WISE results will address many fundamental topics, but the passbands and sensitivity
Autor:
Suwen Wang, J. P. Turneaure, Jon Kirschenbaum, John H. Goebel, G. M. Keiser, Robert P. Farley
Publikováno v:
SPIE Proceedings.
Gravity Probe-B (GP-B) is a space mission that was launched in April 2004 that is intended to measure the prediction by General Relativity Theory that a rotating gravitational field, namely the Earth's, "drags" the space-time continuum by a definite
Publikováno v:
SPIE Proceedings.
The Gravity Probe B Relativity Mission uses a fused-quartz optical star tracking telescope as the sensor for the control system which points the spacecraft towards its guide star. The telescope is cooled to
Autor:
Ali Kashani, Ada M. Jefferson, Matthew Bye, M.T. Sullivan, Jeff Grant, Paul K. Limtiaco, Donald E. Davidson, Lynn W. Huff, D.B. DeBra, D. Gill, Enrique Romero, Paul Ehrensberger, John H. Goebel, Howard P. Demroff, Kenneth J. Triebes, Scott Fletcher
Publikováno v:
SPIE Proceedings.
This paper describes the design, fabrication, and testing of a low-temperature detector mount system which providesthermal isolation between detector electronics, operating at 80 kelvins, and a quartz telescope at 2.5 kelvins. The detectorwill be use
Autor:
Ben Gable, Arthur D. van Rheenen, Theodore T. Weber, Leon L. Jostad, Joo-Young Kim, John H. Goebel
Publikováno v:
SPIE Proceedings.
The spectral noise characteristics of Aerojet GaAs n-JFETs have been investigated down to liquid helium temperatures. Voltage noise characterization was performed with the FET in 1) the floating gate mode, 2) the grounded gate mode to determine the l
Autor:
John Conklin, Martin Trittler, John H. Goebel, Patrick Lu, Graham Allen, Aaron Swank, Robert L. Byer, Saps Buchman, Sei Higuchi, Domenico Gerardi, D.B. DeBra, Nick Leindecker, Ke-Xun Sun, Edgar Torres
Publikováno v:
Journal of Physics: Conference Series. 154:012026
The Modular Gravitational Reference Sensor (MGRS) is targeted as a next generation core instrument for both space gravitational wave detection and an array of other precision gravitational experiments in space. The objectives of the NASA funded progr