Space Telescopes and Instrumentation 2008: Ultraviolet to Gamma Ray 2008

DOI: 10.1117/12.788962

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Figure verification of a precision ultra-lightweight mirror: techniques and results from the SHARPI/PICTURE mirror at NASA/GSFC

Scott Antonille

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“…The original PICTURE primary mirror, 52 flown on Flight I, did not survive reentry and landing. A new light-weighted silicon carbide primary mirror with a silicon cladding was designed by AOA Xinetics/Northrop Grumman to survive the rigors of launch and provide a sufficiently low surface error to demonstrate the VNC in space and measure the predicted Eri inner warm dust ring.…”

Section: Primary Mirrormentioning

confidence: 98%

Wavefront sensing in space: flight demonstration II of the PICTURE sounding rocket payload

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et al. 2018

J. Astron. Telesc. Instrum. Syst.

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A NASA sounding rocket for high-contrast imaging with a visible nulling coronagraph, the Planet Imaging Concept Testbed Using a Rocket Experiment (PICTURE) payload, has made two suborbital attempts to observe the warm dust disk inferred around Epsilon Eridani. The first flight in 2011 demonstrated a 5 milliarcsecond fine pointing system in space. The reduced flight data from the second launch, on 25 November 2015, presented herein, demonstrate active sensing of wavefront phase in space. Despite several anomalies in flight, post-facto reduction phase stepping interferometer data provides insight into the wavefront sensing precision and the system stability for a portion of the pupil. These measurements show the actuation of a 32×32-actuator microelectromechanical system deformable mirror. The wavefront sensor reached a median precision of 1.4 nanometers per pixel, with 95% of samples between 0.8 and 12.0 nanometers per pixel. The median system stability, including telescope and coronagraph wavefront errors other than tip, tilt, and piston, was 3.6 nanometers per pixel, with 95% of samples between 1.2 and 23.7 nanometers per pixel.

“…The original PICTURE primary mirror, 52 flown on Flight I, did not survive reentry and landing. A new light-weighted silicon carbide primary mirror with a silicon cladding was designed by AOA Xinetics/Northrop Grumman to survive the rigors of launch and provide a sufficiently low surface error to demonstrate the VNC in space and measure the predicted Eri inner warm dust ring.…”

Section: Primary Mirrormentioning

confidence: 98%

Wavefront sensing in space: flight demonstration II of the PICTURE sounding rocket payload

¹

,

²

,

³

et al. 2018

J. Astron. Telesc. Instrum. Syst.

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A NASA sounding rocket for high-contrast imaging with a visible nulling coronagraph, the Planet Imaging Concept Testbed Using a Rocket Experiment (PICTURE) payload, has made two suborbital attempts to observe the warm dust disk inferred around Epsilon Eridani. The first flight in 2011 demonstrated a 5 milliarcsecond fine pointing system in space. The reduced flight data from the second launch, on 25 November 2015, presented herein, demonstrate active sensing of wavefront phase in space. Despite several anomalies in flight, post-facto reduction phase stepping interferometer data provides insight into the wavefront sensing precision and the system stability for a portion of the pupil. These measurements show the actuation of a 32×32-actuator microelectromechanical system deformable mirror. The wavefront sensor reached a median precision of 1.4 nanometers per pixel, with 95% of samples between 0.8 and 12.0 nanometers per pixel. The median system stability, including telescope and coronagraph wavefront errors other than tip, tilt, and piston, was 3.6 nanometers per pixel, with 95% of samples between 1.2 and 23.7 nanometers per pixel.

PICTURE: a sounding rocket experiment for direct imaging of an extrasolar planetary environment

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et al. 2012

Space Telescopes and Instrumentation 2012: Optical, Infrared, and Millimeter Wave

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Planet Imaging Coronagraphic Technology Using a Reconfigurable Experimental Base (PICTURE-B): The Second in the Series of Suborbital Exoplanet Experiments

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et al. 2016

J. Astron. Instrum.

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The PICTURE-B sounding rocket mission is designed to directly image the exozodiacal light and debris disk around the Sun-like star Epsilon Eridani. The payload used a 0.5[Formula: see text]m diameter silicon carbide primary mirror and a visible nulling coronagraph which, in conjunction with a fine pointing system capable of 5[Formula: see text]milliarcsecond stability, was designed to image the circumstellar environment around a nearby star in visible light at small angles from the star and at high contrast. Besides contributing an important science result, PICTURE-B matures essential technology for the detection and characterization of visible light from exoplanetary environments for future larger missions currently being imagined. The experiment was launched from the White Sands Missile Range in New Mexico on 2015 November 24 and demonstrated the first space operation of a nulling coronagraph and a deformable mirror. Unfortunately, the experiment did not achieve null, hence did not return science results.

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