Goddard High Resolution Spectrograph
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The Goddard High Resolution Spectrograph (GHRS or HRS) was a spectrograph installed on the Hubble Space Telescope. It was replaced by the Near Infrared Camera and Multi-Object Spectrometer (NICMOS) in 1997.[1] The instrument is named after 20th century rocket pioneer Robert H. Goddard.[2]
One of the results was the discovery of tenuous atmosphere for Jupiter's moon Europa in 1995.[3] The gas was determined to be mostly of molecular oxygen (O2).[3][4] The surface pressure of Europa's atmosphere is 0.1 μPa, or 10−12 times that of the Earth.[5]
GHRS facts
- Instrument type: Ultraviolet spectrograph
- Wavelength range: 1050 to 3200 Å (105 to 320 nm)
- Resolving Power at 1200 Å (120 nm)
- Low - 2,000 (0.6 Å or 60 pm, or a Doppler effect of 150 km/s)
- Medium - 20,000 (0.06 Å or 6 pm, 15 km/s)
- High - 100,000 (0.012 Å or 1.2 pm, 3 km/s)
A technical description of the construction and operation of the GHRS can be found in NASA technical report CP-2244.[6]
References
- ^ SM3A
- ^ [1]
- ^ a b Hall, D. T.; Strobel, D. F.; Feldman, P. D.; McGrath, M. A.; Weaver, H. A. (1995). "Detection of an oxygen atmosphere on Jupiter's moon Europa". Nature. 373 (6516): 677–681. Bibcode:1995Natur.373..677H. doi:10.1038/373677a0. PMID 7854447.
- ^ Savage, Donald; Jones, Tammy; Villard, Ray (23 February 1995). "Hubble Finds Oxygen Atmosphere on Europa". Project Galileo. NASA, Jet Propulsion Laboratory. Retrieved 17 August 2007.
- ^ McGrath (2009). "Atmosphere of Europa". In Pappalardo, Robert T.; McKinnon, William B.; Khurana, Krishan K. (eds.). Europa. University of Arizona Press. ISBN 0-8165-2844-6.
- ^ The Space Telescope Observatory (Technical report). NASA. 1982. CP-2244., page 76. A 40 MB PDF file.
External links
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