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Proceedings Paper

New dust measurements at ORM, and comparison with Paranal Observatory
Author(s): G. Lombardi; V. Zitelli; S. Ortolani; A. Ghedina; A. Garcia; E. Molinari; C. Gatica
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Paper Abstract

The performances of a modern telescope and its safety are dependent on the presence of atmospheric dust. The TNG telescope at ORM (Canary Islands) was one of the first sites monitored on a continuous basis by an automatic dust monitor. This paper presents the analysis of about 10 years of atmospheric dust content collected at the ORM using the TNG facilities. We have detected particles of 0.3, 0.5, 1.0, 3.0, 5.0 and 10.0 μm size. In this study particles of 0.5 and 5.0 μm measured at Paranal Observatory (Chile) are also compared to those similar at TNG. The seasonal behavior of the particles content in the atmosphere is compared between the two sites. The contribution of the dust emissivity to the sky brightness in the NIR is computed for the first time. To complete this study we defined the aerosol mass critical limit to be used as a safety limit for the observations. We found a limit of 12 μg m-3 as total mass of (0.5 + 5.0) μm particles.

Paper Details

Date Published: 6 August 2010
PDF: 6 pages
Proc. SPIE 7733, Ground-based and Airborne Telescopes III, 77334G (6 August 2010); doi: 10.1117/12.856981
Show Author Affiliations
G. Lombardi, European Organisation for Astronomical Research in the Southern Hemisphere (Chile)
V. Zitelli, INAF-Bologna Astronomical Observatory (Italy)
S. Ortolani, Univ. of Padova (Italy)
A. Ghedina, Fundación Galileo Galilei and Telescopio Nazionale Galileo (Spain)
A. Garcia, Fundación Galileo Galilei and Telescopio Nazionale Galileo (Spain)
E. Molinari, Fundación Galileo Galilei and Telescopio Nazionale Galileo (Spain)
C. Gatica, Pontificia Univ. Catolica (Chile)

Published in SPIE Proceedings Vol. 7733:
Ground-based and Airborne Telescopes III
Larry M. Stepp; Roberto Gilmozzi; Helen J. Hall, Editor(s)

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