Jess A. Johnson

The MMT adaptive optics exoplanet characterization system (MAPS) update

Manny Montoya, Krishna Kanumalla, Swaetha Ramkumar, Jorge A. Sanchez et autres

This update focuses on the Adaptive Secondary (AO) system on the MMT 6.5m telescope, which has been operating on-sky for the past four years. The review will cover the system’s performance, including the Adaptive Secondary, the SAPHIRA-fed IR Wavefront Sensor, the CACAO …

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Feedforward control for the MAPS adaptive secondary mirror

Jess A. Johnson, Amali Vaz, Katie M. Morzinski, Jennifer L. Patience et autres

The MMT Adaptive optics exoPlanet characterization System (MAPS) has entered its second year of commissioning on Mount Hopkins, Arizona, with continued development of its magnetic voice coil actuated adaptive secondary mirror (ASM). While previous work focused on actuator tuning and control law …

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Preliminary characterization results for Sony IMX CMOS imaging sensors for astronomical imaging

Jess A. Johnson, Ewan S. Douglas, Kyle Van Gorkom, Douglas Kelly et autres

CMOS imaging sensors have undergone remarkable technological advancements in the last decade. The performance of industrial grade CMOS imagers, especially with the introduction of back-side illumination, has progressed to the point where even these OTS sensors are now being considered as low-cost …

An investigation into the high contrast performance of the IMX492 and IMX571 imaging sensors

Jess A. Johnson, Olivier Durney, Kyle Van Gorkom, Adam Schilperoort et autres

High-contrast coronagraphic imaging in reflected light requires suppression of stellar light by factors exceeding 1×10−9, placing stringent demands on imaging sensor performance. This study investigates the behavior of two industrial-grade Sony CMOS sensors, the IMX492 (Pregius) and IMX571 (Starvis), used on the …

Tuning the MAPS adaptive secondary mirror: actuator control, PID tuning, power spectra, and failure diagnosis

Jess A. Johnson, Amali Vaz, Manny M. Montoya, Katie M. Morzinski et autres

The MMT Adaptive optics exoPlanet characterization System (MAPS) is currently in its engineering phase, operating on sky at the MMT Telescope. The MAPS Adaptive Secondary Mirror’s actuators are controlled by a closed loop modified PID control law and an open loop feed …

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Exhibiting ‘New Perspectives’: Creating a Virtual and Collaborative Exhibition on Ancient Nubia

Melissa S. Cradic, Jess A. Johnson, Brooke E. Norton, Samuel D. Pfister

Tuning the MAPS Adaptive Secondary Mirror: Actuator Control, PID Tuning, Power Spectra and Failure Diagnosis

Jess A. Johnson, Amali Vaz, Manny M. Montoya, Katie M. Morzinski et autres

The MMT Adaptive optics exoPlanet characterization System (MAPS) is currently in its engineering phase, operating on-sky at the MMT Telescope on Mt. Hopkins in southern Arizona. The MAPS Adaptive Secondary Mirror's actuators are controlled by a closed loop modified PID control law …

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Focus diverse phase retrieval testbed development of continuous wavefront sensing for space telescope applications

Hyukmo Kang, Kyle Van Gorkom, Jess A. Johnson, Ole Singelstad et autres

Continuous wavefront sensing on future space telescopes allows relaxation of stability requirements while still allowing on-orbit diffraction-limited optical performance. We consider the suitability of phase retrieval to continuously reconstruct the phase of a wavefront from on-orbit irradiance measurements or point spread function …

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The MAPS adaptive secondary mirror: first light, laboratory work, and achievements

Jess A. Johnson, Amali Vaz, Manny M. Montoya, Narsireddy Anugu et autres

The MMT Adaptive Optics exoPlanet Characterization System (MAPS) is a comprehensive update to the first generation MMT adaptive optics system (MMTAO), designed to produce a facility class suite of instruments whose purpose is to image nearby exoplanets. The system’s adaptive secondary mirror …

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The MAPS Adaptive Secondary Mirror: First Light, Laboratory Work, and Achievements

Jess A. Johnson, Amali Vaz, Manny M. Montoya, Narsireddy Anugu et autres

The MMT Adaptive Optics exoPlanet Characterization System (MAPS) is a comprehensive update to the first generation MMT adaptive optics system (MMTAO), designed to produce a facility class suite of instruments whose purpose is to image nearby exoplanets. The system's adaptive secondary mirror …

us, ca (code pays fourni par la source)

Focus diverse phase retrieval testbed development of continuous wavefront sensing for space telescope applications

Hyukmo Kang, Kyle Van Gorkom, Jess A. Johnson, Ole Singlestad et autres

Continuous wavefront sensing on future space telescopes allows relaxation of stability requirements while still allowing on-orbit diffraction-limited optical performance. We consider the suitability of phase retrieval to continuously reconstruct the phase of a wavefront from on-orbit irradiance measurements or point spread function …

Recent Advances and Achievements at The Catalina Sky Survey

G. J. Leonard, E. Christensen, D. C. Fuls, A. R. Gibbs et autres