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Despite constituting a widespread and significant environmental change, understanding of artificial nighttime skyglow is extremely limited. Until now, published monitoring studies have been local or regional in scope, and typically of short duration. In this first major international compilation of monitoring data we answer several key questions about(More)
  • R. Volkmer, O. von der Lühe, +18 authors K. G. Strassmeier
  • 2010
1 Kiepenheuer-Institut für Sonnenphysik, Schöneckstr. 6, 79104 Freiburg, Germany 2 Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482 Potsdam, Germany 3 Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany 4 Instituto de Astrofı́sica de Canarias, Via Lactea, 38200 La Laguna, Spain 5 Astronomical(More)
VIRUS is a planned integral-field instrument for the Hobby-Eberly Telescope (HET). In order to achieve a large field-ofview and high grasp at reasonable costs, the approach is to replicate integral-field units (IFU) and medium sized spectrographs many times. The Astrophysical Institute Potsdam (AIP) contributes to VIRUS with the development and testing of(More)
The Visual Integral-Field Replicable Unit Spectrograph (VIRUS) instrument is being built to support observations for the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX) project. The instrument consists of 150+ identical fiber-fed integral field optical spectrographs. This instrument provides a unique challenge in astronomical instrumentation: each of(More)
We describe the design, construction, and performance of VIRUS-P (Visible Integral-field Replicable Unit Spectrograph – Prototype), the prototype for 150+ identical fiber-fed integral field spectrographs for the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). VIRUS-P was commissioned in 2007, is in regular service on the McDonald Observatory 2.7 m(More)
Christopher C. M. Kyba, Kai Pong Tong, Jonathan Bennie, Ignacio Birriel, Jennifer J. Birriel, Andrew Cool, Arne Danielsen, Thomas W. Davies, Peter N. den Outer, William Edwards, Rainer Ehlert, Fabio Falchi, Jürgen Fischer, Andrea Giacomelli, Francesco Giubbilini, Marty Haaima, Claudia Hesse, Georg Heygster, Franz Hölker, Richard Inger, Linsey J. Jensen,(More)
  • R. Volkmer, O. von der Lühe, +17 authors K. Strassmeier
  • 2010
With the integration of a 1-meter Cesic primary mirror the GREGOR telescope pre-commissioning started. This is the first time, that the entire light path has seen sunlight. The pre-commissioning period includes testing of the main optics, adaptive optics, cooling system, and pointing system. This time was also used to install a near-infrared grating(More)
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