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Proceedings Paper

High-resolution x-ray imaging spectrometer (HREXI) SmallSat Pathfinder (HSP) (Conference Presentation)
Author(s): Jonathan Grindlay; Branden E. Allen; Jaesub E. Hong; Daniel E. Violette; Martin E. Elvis; Scott Barthelmy; John Tomsick

Paper Abstract

HSP was selected for the NASA Astrophysics Science SmallSat Study (AS3) program as a SmallSat mission concept that will be proposed for a 1 – 2 year science mission to demonstrate performance and cost goals to enable a future Explorer-class SmallSat Constellation mission for the first simultaneous full-sky imager with 2X finer resolution. HSP is a 36 x 36deg (FWHM) coded aperture telescope with 16 x 16 CdZnTe detectors, each 20 x 20 x 3mm with 32 x 32 0.6mm pixels and ~1.5keV energy resolution. The 1024 cm^2 HSP imaging detector array views the sky through the Tungsten coded aperture mask (0.7 mm pixels) at 68cm, providing 4’ imaging and <30” source positions over the 3 – 200 keV band. This is mounted on a Blue Canyon Technologies (BCT) SmallSat (S5) bus, with ~10arcsec pointing and star camera aspect, extends the capabilities of Swift/BAT and INTEGRAL/IBIS. HSP will promptly localize long and short GRBs and outbursts of X-ray transients: from nearby M dwarf flares, to BH-LMXB outbursts, Blazar flares and Jetted TDEs.  HSP will daily-monitor the Galactic Bulge and adjacent Galactic plane and > 2 nearby OB association regions for 1 yr, providing high cadence light curves of black hole X-ray binaries (with low and high mass companions) in the Galaxy.  HSP matches the on-axis sensitivity of Swift/BAT in the 15 – 200 keV band with 5X finer spatial resolution, and the simultaneous 3 – 15 keV imaging and spectra surpass MAXI with 15X finer spatial resolution, all within an ESPA class mission in LEO at ~500-600 km and <~30 deg inclination.

Paper Details

Date Published: 9 September 2019
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Proc. SPIE 11118, UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XXI, 111180X (9 September 2019);
Show Author Affiliations
Jonathan Grindlay, Harvard Univ. (United States)
Branden E. Allen, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Jaesub E. Hong, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Daniel E. Violette, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Martin E. Elvis, Harvard-Smithsonian Ctr. for Astrophysics (United States)
Scott Barthelmy, NASA Goddard Space Flight Ctr. (United States)
John Tomsick, Space Sciences Lab. (United States)


Published in SPIE Proceedings Vol. 11118:
UV, X-Ray, and Gamma-Ray Space Instrumentation for Astronomy XXI
Oswald H. Siegmund, Editor(s)

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