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Advances in Astronomy
Volume 2010 (2010), Article ID 268501, 8 pages
Research Article

High-Speed and Wide-Field Photometry with TORTORA

1Astronomy Department, Bologna University, 40126 Bologna, Italy
2Special Astrophysical Observatory of Russian Academy of Science, 369167 Nizhnij Arkhyz, Russia
3Institute for Precise Instrumentation, 369167 Nizhnij Arkhyz, Russia

Received 8 July 2009; Accepted 24 September 2009

Academic Editor: Alberto J. Castro-Tirado

Copyright © 2010 G. Greco et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


We present the photometric analysis of the extended sky fields observed by the TORTORA optical monitoring system. The technology involved in the TORTORA camera is based on the use of a fast TV-CCD matrix with an image intensifier. This approach can both significantly reduce the readout noise and shorten the focal length following to monitor relatively large sky regions with high temporal resolution and adequate detection limit. The performance of the system has been tested using the relative magnitudes of standard stars by means of long image sequences collected at different airmasses and at various intensities of the moon illumination. As expected from the previous laboratory measurements, artifact sources are negligible and do not affect the photometric results. The following analysis is based on a large sample of images acquired by the TORTORA instrument since July 2006.