ACCESS pointing control system

Brugarolas, Paul; Alexander, James W.; Trauger, John T.; Moody, Dwight; Egerman, Robert; Vallone, Phillip; Elias, Jason; Hejal, Reem; Camelo, Vanessa; Bronowicki, Allen J.; O’Connor, David J.; Patrick, Richard W; Orzechowski, P.K.; Spittler, Connie; Lillie, Chuck

doi:10.1117/12.856518

Cited by 17 publications

(11 citation statements)

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“…35 calculated the contrast degradation sensitivities due to errors in telescope pointing and mask centering (see also Refs. [36][37][38]. The pointing stability requirements for Zodiac II are guided by those calculations, which translate to a 0.4 arcsec RMS line-of-sight stability for the telescope body-pointing and a 0.04 arcsec RMS coronagraph mask centering error.…”

Section: Pointing Systemmentioning

confidence: 99%

Coronagraphic imaging of debris disks from a high altitude balloon platform

Unwin

Traub

Bryden

et al. 2012

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

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Debris disks around nearby stars are tracers of the planet formation process, and they are a key element of our understanding of the formation and evolution of extrasolar planetary systems. With multi-color images of a significant number of disks, we can probe important questions: can we learn about planetary system evolution; what materials are the disks made of; and can they reveal the presence of planets? Most disks are known to exist only through their infrared flux excesses as measured by the Spitzer Space Telescope, and through images measured by Herschel. The brightest, most extended disks have been imaged with HST, and a few, such as Fomalhaut, can be observed using ground-based telescopes. But the number of good images is still very small, and there are none of disks with densities as low as the disk associated with the asteroid belt and EdgeworthKuiper belt in our own Solar System. Direct imaging of disks is a major observational challenge, demanding high angular resolution and extremely high dynamic range close to the parent star. The ultimate experiment requires a space-based platform, but demonstrating much of the needed technology, mitigating the technical risks of a space-based coronagraph, and performing valuable measurements of circumstellar debris disks, can be done from a high-altitude balloon platform. In this paper we present a balloon-borne telescope concept based on the Zodiac II design that could undertake compelling studies of a sample of debris disks.

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Section: Pointing Systemmentioning

confidence: 99%

Coronagraphic imaging of debris disks from a high altitude balloon platform

Unwin

Traub

Bryden

et al. 2012

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

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“…However, the microvibrations induced by mechanical moving devices onboard spacecrafts, such as flywheels, solar array drive motors and cryo-coolers could undermine the stability of the bus seriously, causing deleterious effects on the pointing performance (Brugarolas et al, 2010;Oh et al, 2013). Therefore, more and more attentions have been turned to dealing with the microvibration problems of the spacecrafts in recent years (Lillie et al, 2010;Tan et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

Modeling and analysis of a flywheel microvibration isolation system for spacecrafts

Wei

Luo

et al. 2015

Advances in Space Research

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“…Figure 8 shows the contrast deltas (vs. four specifications of rms surface quality on the optical elements following the primary mirror) due to beamwalk on the optics upstream of the fine steering mirror. The telescope attitude control system, augmented by a fine steering mirror within the coronagraph, stabilizes the star image on the coronagraph occulting mask (all four coronagraphs have a focal plane occulting mask) to 0.45 milliarcsec (3σ) 24 , as required for high contrast at inner working angles as small as 2 λ/D, as indicated in Figure 8. …”

Section: Systems: Pointing Control and Thermal Stabilitymentioning

confidence: 99%

“…Telescope body pointing (the LOS) is stabilized to 1 milliarcsec (3σ) with an active jitter control system 24 . Figure 8 shows the contrast deltas (vs. four specifications of rms surface quality on the optical elements following the primary mirror) due to beamwalk on the optics upstream of the fine steering mirror.…”

Section: Systems: Pointing Control and Thermal Stabilitymentioning

confidence: 99%

ACCESS: a concept study for the direct imaging and spectroscopy of exoplanetary systems

et al. 2010

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ACCESS is one of four medium-class mission concepts selected for study in 2008-9 by NASA's Astrophysics Strategic Mission Concepts Study program. ACCESS evaluates a space observatory designed for extreme high-contrast imaging and spectroscopy of exoplanetary systems. An actively-corrected coronagraph is used to suppress the glare of diffracted and scattered starlight to contrast levels required for exoplanet imaging. The ACCESS study considered the relative merits and readiness of four major coronagraph types, and modeled their performance with a NASA medium-class space telescope. The ACCESS study asks: What is the most capable medium-class coronagraphic mission that is possible with telescope, instrument, and spacecraft technologies available today? Using demonstrated high-TRL technologies, the ACCESS science program surveys the nearest 120+ AFGK stars for exoplanet systems, and surveys the majority of those for exozodiacal dust to the level of 1 zodi at 3 AU. Coronagraph technology developments in the coming year are expected to further enhance the science reach of the ACCESS mission concept.

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ACCESS pointing control system

Cited by 17 publications

References 0 publications

Coronagraphic imaging of debris disks from a high altitude balloon platform

Coronagraphic imaging of debris disks from a high altitude balloon platform

Modeling and analysis of a flywheel microvibration isolation system for spacecrafts

ACCESS: a concept study for the direct imaging and spectroscopy of exoplanetary systems

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