The Mercury Atmospheric and Surface Composition Spectrometer for the MESSENGER Mission
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The Mercury Atmospheric and Surface Composition Spectrometer (MASCS) is one of seven science instruments onboard the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) spacecraft en route to the planet Mercury. MASCS consists of a small Cassegrain telescope with 257-mm effective focal length and a 50-mm aperture that simultaneously feeds an UltraViolet and Visible Spectrometer (UVVS) and a Visible and InfraRed Spectrograph (VIRS). UVVS is a 125-mm focal length, scanning grating, Ebert-Fastie monochromator equipped with three photomultiplier tube detectors that cover far ultraviolet (115–180 nm), middle ultraviolet (160–320 nm), and visible (250–600 nm) wavelengths with an average 0.6-nm spectral resolution. It will measure altitude profiles of known species in order to determine the composition and structure of Mercury’s exosphere and its variability and will search for previously undetected exospheric species. VIRS is a 210-mm focal length, fixed concave grating spectrograph equipped with a beam splitter that simultaneously disperses the spectrum onto a 512-element silicon visible photodiode array (300–1050 nm) and a 256-element indium-gallium-arsenide infrared photodiode array 850–1,450 nm. It will obtain maps of surface reflectance spectra with a 5-nm resolution in the 300–1,450 nm wavelength range that will be used to investigate mineralogical composition on spatial scales of 5 km. UVVS will also observe the surface in the far and middle ultraviolet at a 10-km or smaller spatial scale. This paper summarizes the science rationale and measurement objectives for MASCS, discusses its detailed design and its calibration requirements, and briefly outlines observation strategies for its use during MESSENGER orbital operations around Mercury.
KeywordsAtmosphere Exosphere Mercury MESSENGER Spectrometer Surface
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- J.B. Adams, T.B. McCord, Proc. Apollo 11 Lunar Sci. Conf., 1970, pp. 1937–1945 Google Scholar
- E.T. Bradley, G.M. Holsclaw, W.E. McClintock, N.R. Izenberg, Eos Trans. Am. Geophys. Union 87 (Jt. Assem. Suppl.) (2006), abstract P41B-01 Google Scholar
- G. Holsclaw, T. Bradley, W.E. McClintock, N. Izenberg, R. Vaughan, M.S. Robinson, Eos Trans. Am. Geophys. Union 86 (Fall Meeting Suppl.) (2005), abstract P51A-0896, p. F1198 Google Scholar
- D.M. Hunten, T.H. Morgan, D.E. Shemansky, in Mercury, ed. by F. Vilas, C.R. Chapman, M.S. Matthews (University of Arizona Press, Tucson, 1988), pp. 562–612 Google Scholar
- J.F. James, R.S. Sternberg, The Design of Optical Spectrometers (Chapman and Hall, London, 1969) Google Scholar
- S.W. Maymon, S.P. Neeck, J.C. Moody Sr., Soc. Photo-Optical Instr. Eng. 924, 10–22 (1988) Google Scholar
- W.E. McClintock, E.T. Bradley, G.M. Holsclaw, Applied Physics Laboratory Report No. 7384-9470, 2004 Google Scholar