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Your search keyword '"April Jewell"' showing total 7 results
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7 results on '"April Jewell"'

1. SPARCS Payload Assembly, Integration, and Test Update

Author

Paul A Scowen, Evgenya Shkolnik, David Ardila, Logan Jensen, Johnathan Gamaunt, Shouleh Nikzad, April Jewell, Jim Austin, Matthew Beasley, Travis Barman, Judd Bowman, Varoujan Gorjian, Dawn Gregory, Daniel C. Jacobs, Joe Llama, Mary Knapp, Victoria Meadows, Sarah Peacock, Tahina Ramiaramanantsoa, Mark Swain, Peter Vedder, Lisa Whelan, and Robert Zellem

Subjects
Spacecraft Instrumentation And Astrionics, Astronomy
Abstract

The Star-Planet Activity Research CubeSat (SPARCS) is a 6U CubeSat under construction that is devoted to the photometric monitoring of M stars in the far-UV (FUV) and near-UV (NUV), to measure the time-dependent spectral slope, intensity and evolution of low-mass star high-energy radiation. We report on the progress made in the assembly, integration and test of the instrument payload at Arizona State University using a custom TVAC chamber and optical stimulus that provides calibration light sources and the custom contamination control environment that the FUV demands. The payload consists of a custom 90mm clear aperture telescope developed by Hexagon/Sigma Space, combined with a dichroic plate to separate the FUV and NUV beams developed by Teledyne Acton and Materion, married with twin focal plane array cameras separately optimized for their band passes as developed by JPL.

Published
2022

2. Onboard dynamic image exposure control for the Star–Planet Activity Research CubeSat (SPARCS)

Author

Tahina Ramiaramanantsoa, Judd D Bowman, Evgenya L Shkolnik, R O Parke Loyd, David R Ardila, April Jewell, Travis Barman, Christophe Basset, Matthew Beasley, Samuel Cheng, Johnathan Gamaunt, Varoujan Gorjian, John Hennessy, Daniel Jacobs, Logan Jensen, Mary Knapp, Joe Llama, Victoria Meadows, Shouleh Nikzad, Sarah Peacock, Paul Scowen, and Mark R Swain

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Astrophysics::Solar and Stellar Astrophysics, Astronomy and Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics - Instrumentation and Methods for Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, Instrumentation and Methods for Astrophysics (astro-ph.IM), Solar and Stellar Astrophysics (astro-ph.SR), Astrophysics::Galaxy Astrophysics
Abstract

The Star-Planet Activity Research CubeSat (SPARCS) is a 6U CubeSat under development to monitor the flaring and chromospheric activity of M dwarfs at near-ultraviolet (NUV) and far-ultraviolet (FUV) wavelengths. The spacecraft hosts two UV-optimized delta-doped charge-coupled devices fed by a 9-cm telescope and a dichroic beam splitter. A dedicated science payload processor performs near real-time onboard science image processing to dynamically change detector integration times and gains to reduce the occurrence of pixel saturation during strong M dwarf flaring events and provide adequate flare light curve structure resolution while enabling the detection of low-amplitude rotational modulation. The processor independently controls the NUV and FUV detectors. For each detector, it derives control updates from the most recent completed exposure and applies them to the next exposure. The detection of a flare event in the NUV channel resets the exposure in the FUV channel with new exposure parameters. Implementation testing of the control algorithm using simulated light curves and full-frame images demonstrates a robust response to the quiescent and flaring levels expected for the stars to be monitored by the mission. The SPARCS onboard autonomous exposure control algorithm is adaptable for operation in future point source-targeting space-based and ground-based observatories geared towards the monitoring of extreme transient astrophysics phenomena., 11 pages, 8 figures; Monthly Notices of the Royal Astronomical Society (MNRAS), in press

Published
2021
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3. FIREBall-2: The Faint Intergalactic Medium Redshifted Emission Balloon Telescope

Author

Erika Hamden, D. Christopher Martin, Bruno Milliard, David Schiminovich, Shouleh Nikzad, Jean Evrard, Gillian Kyne, Robert Grange, Johan Montel, Etienne Pirot, Keri Hoadley, Donal O’Sullivan, Nicole Melso, Vincent Picouet, Didier Vibert, Philippe Balard, Patrick Blanchard, Marty Crabill, Sandrine Pascal, Frederi Mirc, Nicolas Bray, April Jewell, Julia Blue Bird, Jose Zorilla, Hwei Ru Ong, Mateusz Matuszewski, Nicole Lingner, Ramona Augustin, Michele Limon, Albert Gomes, Pierre Tapie, Xavier Soors, Isabelle Zenone, and Muriel Saccoccio

Published
2020
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4. Developing Sensors to Detect Mercury

Author

Margie L. Homer, Hanying Zhou, April Jewell, Charles Taylor, Abhijit Shevade, Adam Kisor, Margaret Ryan, Shiao-Pin Yen, Mario Blanco, and William Goddard

Abstract

not Available.

Published
2006
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