The Omegacam Shutter

Reif, K.; Klink, G.; Müller, Phillip; Poschmann, Henning

doi:10.1007/1-4020-2527-0_44

Cited by 7 publications

(5 citation statements)

References 1 publication

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“…The Bonn shutter of the instrument allows for such very short exposures. On OmegaCam, a similar shutter is reported by [10] to deliver equally-exposed images at exposure times down to 0.1 sec. To minimize the effect of sky-brightness gradients, the telescope is pointed to the anti-solar azimuth and five degrees away from the zenith.…”

Section: Ensuring High Quality Flat-fieldingmentioning

confidence: 91%

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Three Years of Experience with the STELLA Robotic Observatory

Granzer

Weber

Strassmeier

2010

Advances in Astronomy

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Since May 2006, the two STELLA robotic telescopes at the Izaña observatory in Tenerife, Spain, delivered an almost uninterrupted stream of scientific data. To achieve such a high level of autonomous operation, the replacement of all troubleshooting skills of a regular observer in software was required. Care must be taken on error handling issues and on robustness of the algorithms used. In the current paper, we summarize the approaches we followed in the STELLA observatory.

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Section: Ensuring High Quality Flat-fieldingmentioning

confidence: 91%

Section: Ensuring High Quality Flat-fieldingmentioning

confidence: 91%

Three Years of Experience with the STELLA Robotic Observatory

Granzer

Weber

Strassmeier

2010

Advances in Astronomy

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“…The shutter is composed of two blades that form a moving slot of variable width to provide uniform exposure of the focal plane. The shortest exposure is about 1ms and exposure homogeneity is 0.3% in a 100ms exposure (Reif et al 2004).…”

Section: The Skymapper Imagermentioning

confidence: 99%

SkyMapper and the Southern Sky Survey

Tisserand

Keller

Schmidt

et al. 2008

Astrophysics and Space Science Proceedings

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This paper presents the design and science goals for the SkyMapper telescope. SkyMapper is a 1.3m telescope featuring a 5.7 square degree field-of-view Cassegrain imager commissioned for the Australian National University's Research School of Astronomy and Astrophysics. It is located at Siding Spring Observatory, Coonabarabran, NSW, Australia and will see first light in late 2007. The imager possesses 16k×16k 0.5 arcsec pixels. The primary scientific goal of the facility is to perform the Southern Sky Survey, a six colour and multi-epoch (4 hour, 1 day, 1 week, 1 month, 1 year sampling) photometric survey of the southerly 2π steradians to g ∼23 mag. The survey will provide photometry to better than 3% global accuracy and astrometry to better than 50 mas. Data will be supplied to the community as part of the Virtual Observatory effort. The survey will take five years to complete.

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“…Both spectrograph arms are equipped with an own shutter. We employ two "Bonn shutters" (Reif et al 2007) with a free 200×200 mm aperture. Each shutter is made of two moving blades of a carbon fibre compound and run by two stepper motors.…”

Section: Shuttersmentioning

confidence: 99%

PEPSI: The high‐resolution échelle spectrograph and polarimeter for the Large Binocular Telescope

et al. 2015

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PEPSI is the bench-mounted, two-arm, fibre-fed and stabilized Potsdam Echelle Polarimetric and Spectroscopic Instrument for the 2×8.4 m Large Binocular Telescope (LBT). Three spectral resolutions of either 43 000, 120 000 or 270 000 can cover the entire optical/red wavelength range from 383 to 907 nm in three exposures. Two 10.3k×10.3k CCDs with 9-μm pixels and peak quantum efficiencies of 94-96 % record a total of 92échelle orders. We introduce a new variant of a wave-guide image slicer with 3, 5, and 7 slices and peak efficiencies between 92-96 %. A total of six cross dispersers cover the six wavelength settings of the spectrograph, two of them always simultaneously. These are made of a VPH-grating sandwiched by two prisms. The peak efficiency of the system, including the telescope, is 15 % at 650 nm, and still 11 % and 10 % at 390 nm and 900 nm, respectively. In combination with the 110 m 2 light-collecting capability of the LBT, we expect a limiting magnitude of ≈ 20th mag in V in the low-resolution mode. The R = 120 000 mode can also be used with two, dual-beam Stokes IQUV polarimeters. The 270 000-mode is made possible with the 7-slice image slicer and a 100-μm fibre through a projected sky aperture of 0.74 , comparable to the median seeing of the LBT site. The 43 000-mode with 12-pixel sampling per resolution element is our bad seeing or faint-object mode. Any of the three resolution modes can either be used with sky fibers for simultaneous sky exposures or with light from a stabilized Fabry-Pérotétalon for ultra-precise radial velocities. CCD-image processing is performed with the dedicated data-reduction and analysis package PEPSI-S4S. Its full error propagation through all image-processing steps allows an adaptive selection of parameters by using statistical inferences and robust estimators. A solar feed makes use of PEPSI during day time and a 500-m feed from the 1.8 m VATT can be used when the LBT is busy otherwise. In this paper, we present the basic instrument design, its realization, and its characteristics. Some pre-commissioning first-light spectra shall demonstrate the basic functionality.

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The Omegacam Shutter

Cited by 7 publications

References 1 publication

Three Years of Experience with the STELLA Robotic Observatory

Three Years of Experience with the STELLA Robotic Observatory

SkyMapper and the Southern Sky Survey

PEPSI: The high‐resolution échelle spectrograph and polarimeter for the Large Binocular Telescope

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