Calibrating SNAP

Susana Deustua; Sahar Allam; Ralph C. Bohlin; Steven M. Kent; Michael L. Lampton; Bryan E. Laubscher; Nick Mostek; Stuart Mufson; Michael Richmond; J. Allyn Smith; Douglas Tucker

doi:10.1117/12.506652

8 December 2003 Calibrating SNAP

Susana Deustua, Sahar Allam, Ralph C. Bohlin, Steven M. Kent, Michael L. Lampton, Bryan E. Laubscher, Nick Mostek, Stuart Mufson, Michael Richmond, J. Allyn Smith, Douglas Tucker

Author Affiliations +

Proceedings Volume 5164, UV/EUV and Visible Space Instrumentation for Astronomy II; (2003) https://doi.org/10.1117/12.506652
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

The SNAP (Supernova/Acceleration Probe) mission's primary science goal is the determination of the properties of the dark energy. Specifically, observations of distant Type Ia supernovae will be used to measure the dark energy equation of state constant parameter, w₀, and time varying parameter, w₁, to a fractional uncertainty of 0.05 and 0.3 respectively. This places stringent requirements on the control of systematics and on the absolute color calibration of these supernovae. The overall calibration for the SNAP CCD and NIR imagers and spectrograph will be conducted through several routes. We envision employing a variety of well-studied stars, certainly including the HST spectrophotometric standard stars (and possibly the Sun) and performing indirect transfer calibrations that permit comparison with NIST irradiance standards to close the loop with fundamental MKS quantities. We discuss the basic issues and possible strategies in order to achieve approximately 2 - 3% color errors over the wavelength range of from 350 to 1700 nm.

Citation Download Citation

Susana Deustua, Sahar Allam, Ralph C. Bohlin, Steven M. Kent, Michael L. Lampton, Bryan E. Laubscher, Nick Mostek, Stuart Mufson, Michael Richmond, J. Allyn Smith, and Douglas Tucker "Calibrating SNAP", Proc. SPIE 5164, UV/EUV and Visible Space Instrumentation for Astronomy II, (8 December 2003); https://doi.org/10.1117/12.506652

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