The Euclid AOCS science mode design

Bacchetta, A.; Saponara, M.; Torasso, Alberto; Criado, Gonzalo Saavedra; Girouart, Bénédicte

doi:10.1007/s12567-015-0084-2

Cited by 6 publications

(6 citation statements)

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“…To investigate the nature of dark energy, dark matter and gravity, the mission will target two independent primary cosmological probes: Weak gravitational Lensing (WL) and Galaxy clustering (GC). The WL consists of the determination of the shape and the shear of the galaxies detected by visual and near-infrared (NIR) photometric measurements, while the GC is intended as the evaluation of the redshift of about 3500 galaxies per deg 2 by means of NIR spectrometric measurements.…”

Section: Euclid Scientific Missionmentioning

confidence: 99%

“…In addition, the FGS is able to provide accurate measurement of the absolute inertial attitude, and this feature was necessary to cope with the stringent APE requirements derived from the overlap between adjacent observed fields [2]. A reference star catalogue has to be implemented for that purpose, with the objective to achieve an absolute attitude measurement accuracy better than 0.6 arcsec (3σ value) around the transverse axes and better than 8.7 arcsec (3σ value) around the perpendicular axis (boresight).…”

Section: Fgs Performancementioning

confidence: 99%

“…The telescope directs the light to two instruments: the Visual Imager (VIS) and the Near Infrared Spectrometer and Photometer (NISP). The two instruments share a common field of view of ~ 0.54 deg 2 .…”

Section: Introductionmentioning

confidence: 99%

“…The actual galaxies images are obtained from the de-convolution of the collected focal plane images from the Point Spread Function (PSF). From PSF quality indeces like Full Width at Half Maximum (FWHM) and ellipticity [2], it is possible to derive a Relative Pointing Error (RPE) requirement for the AOCS that is rather stringent (lower than 25 milli-arcseconds over 700s, at 1σ, [2]);…”

mentioning

confidence: 99%

“…The requested agility instead implies the presence of high torque authority actuators (the Reaction Wheels (RWL)), which however are not appealing for very stable pointing performance because of its intrinsic noise (micro-vibrations). For this reason, TAS-I developed the so-called Hybrid Solutions [2], where RWL and MPS are used in synergy to cope with both the driving requirements (agility and stable pointing);…”

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confidence: 99%

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Euclid pointing performance: operations for the Fine Guidance Sensor reference star catalogue

Bosco

Bacchetta

Saponara

et al. 2018

2018 SpaceOps Conference

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Euclid is the next medium-class mission of ESA's Science Program, which launch is foreseen in 2020. The objective of Euclid is to elucidate the geometry and the nature of the dark energy and dark matter components of the universe. Thales Alenia Space Italy (TAS-I) is the Prime contractor, and although the program is allocating all the Subsystems to different European industries, some significant AOCS technical tasks have been maintained at System level. In particular TAS-I is in charge to specify the Fine Guidance Sensor (FGS) that is the main attitude sensor necessary to cope with the very stringent pointing requirements. To recognize the detected star pattern and track them the FGS needs to be feed with a star catalogue. A dedicated star catalogue is generated on ground for each Euclid observation starting from a reference database of stars and uploaded on-board. 1 FGS responsible as part of Euclid Prime team, GNC group part of Domain Exploration and Science in Thales Alenia Space. 2 Chief of GNC group and involved as senior engineer in Euclid Prime team, Domain Exploration and Science in Thales Alenia Space. 3 AOCS responsible as part of Euclid Prime team, GNC group part of Domain Exploration and Science in Thales Alenia Space.

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Section: Euclid Scientific Missionmentioning

confidence: 99%

Section: Fgs Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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