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A Solar Aspect System for the HEROES MissionA new Solar Aspect System (SAS) has been developed to provide the ability to observe the Sun on an existing balloon payload HERO (short for High Energy Replicated Optics). Developed under the HEROES program (High Energy Replicated Optics to Explore the Sun), the SAS aspect system provides solar pointing knowledge in pitch, yaw, and roll. The required precision of these measurements must be better than the HEROES X-ray resolution of approximately 20 arcsec Full Width at Half Maximum (FWHM) so as to not degrade the image resolution. The SAS consists of two separate systems: the Pitch-Yaw Aspect System (PYAS) and the Roll Aspect System (RAS). The PYAS functions by projecting an image of the Sun onto a screen with precision fiducials. A CCD camera takes an image of these fiducials, and an automated algorithm determines the location of the Sun as well as the location of the fiducials. The spacing between fiducials is unique and allows each to be identified so that the location of the Sun on the screen can be precisely determined. The RAS functions by imaging the Earth's horizon in opposite directions using a silvered prism imaged by a CCD camera. The design and first results of the performance of these systems during the HEROES flight which occurred in September 2013 are presented here.
Document ID
20160008966
Document Type
Conference Paper
Authors
Christe, Steven (NASA Goddard Space Flight Center Greenbelt, MD United States)
Shih, Albert (NASA Goddard Space Flight Center Greenbelt, MD United States)
Rodriguez, Marcello (NASA Goddard Space Flight Center Greenbelt, MD United States)
Gregory, Kyle (NASA Goddard Space Flight Center Greenbelt, MD United States)
Cramer, Alexander (NASA Goddard Space Flight Center Greenbelt, MD United States)
Edgerton, Melissa (NASA Goddard Space Flight Center Greenbelt, MD United States)
Gaskin, Jessica (NASA Marshall Space Flight Center Huntsville, AL, United States)
O'Connor, Brian (NASA Marshall Space Flight Center Huntsville, AL, United States)
Sobey, Alexander (NASA Marshall Space Flight Center Huntsville, AL, United States)
Date Acquired
July 12, 2016
Publication Date
March 1, 2014
Subject Category
Instrumentation and Photography
Report/Patent Number
GSFC-E-DAA-TN32037
Meeting Information
2014 IEEE Aerospace Conference(Big Sky, MT)
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
Keywords
HEROES
high-altitude balloon

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