Modeling anisoplanatism in the Keck II laser guide star AO system
Abstract
Anisoplanatism is a primary source of photometric and astrometric error in single-conjugate adaptive optics. We present initial results of a project to model the off-axis optical transfer function in the adaptive optics system at the Keck II telescope. The model currently accounts for the effects of atmospheric anisoplanatism in natural guide star observations. The model for the atmospheric contribution to the anisoplanatic transfer function uses contemporaneous MASS/ DIMM measurements. Here we present the results of a validation campaign using observations of naturally guided visual binary stars under varying conditions, parameterized by the r0 and θ0 parameters of the C^2_n atmospheric turbulence profile. We are working to construct a model of the instrumental field-dependent aberrations in the NIRC2 camera using an artificial source in the Nasmyth focal plane. We also discuss our plans to extend the work to laser guide star operation.
Additional Information
© 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). We would like to acknowledge the financial support of the W.M. Keck Foundation for this project. AMG and MM are also supported by NSF AST-0909218. The authors would also like to thank Jay Anderson, Richard Dekaney, Brent Ellerbroek, James Graham, Claire Max, Andrei Tokovinin, and Marcos van Dam for their valuable input to the project.Attached Files
Published - 844724.pdf
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Additional details
- Eprint ID
- 87479
- Resolver ID
- CaltechAUTHORS:20180629-133425296
- W. M. Keck Foundation
- AST-0909218
- NSF
- Created
-
2018-06-29Created from EPrint's datestamp field
- Updated
-
2021-11-15Created from EPrint's last_modified field
- Series Name
- Proceedings of SPIE
- Series Volume or Issue Number
- 8447