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Torben Anderssen. Profile picture.

Torben Andersen

Professor emeritus

Torben Anderssen. Profile picture.

The Earthshine Telescope Project

Author

  • Mette Owner-Petersen
  • Torben Andersen
  • P. Thejll
  • H. Gleisner
  • Arne Ardeberg
  • A. Ulla

Summary, in English

The Earthshine telescope project is a collaborative effort between Lund Observatory (LO) in Sweden and the Danish Meteorological Institute (DMI) with the purpose of constructing one or more robotic telescopes to record the albedo of the Earth over a long time. The objective is to measure long-term development of the global cloud cover and reflectivity for climate modeling. A 1% change in the Earth's albedo results in an average temperature change of 0.5 K which calls for high precision in the albedo measurements. This poses strict demands on the telescope design, in particular with respect to suppression of straylight. The paper describes our proposed optical and mechanical design of the Earthshine telescope, and presents a preliminary straylight analysis of the design as well as first steps towards an 'error budget' for the system. Polarisation due to light-path folding could be an issue for the design being studied.

Department/s

  • Lund Observatory

Publishing year

2010

Language

English

Pages

119-128

Publication/Series

Thalassas

Volume

26

Issue

2

Document type

Journal article

Publisher

University of Vigo

Topic

  • Astronomy, Astrophysics and Cosmology

Keywords

  • Earthshine
  • Telescopes
  • Climate

Status

Published

ISBN/ISSN/Other

  • ISSN: 0212-5919