Analytic and experimental determination of ghosts in the Rosetta Narrow-Angle Camera and their impact on imaging performance

Kjetil Dohlen; Laurent Jorda; Philippe Lamy; Imre Toth; Alain Origne

doi:10.1117/12.857207

10 August 2010 Analytic and experimental determination of ghosts in the Rosetta Narrow-Angle Camera and their impact on imaging performance

Kjetil Dohlen, Laurent Jorda, Philippe Lamy, Imre Toth, Alain Origne

Author Affiliations +

Proceedings Volume 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave; 773149 (2010) https://doi.org/10.1117/12.857207
Event: SPIE Astronomical Telescopes + Instrumentation, 2010, San Diego, California, United States

Abstract

The Rosetta cometary rendezvous mission, one of ESA's cornerstone missions, was launched in 2004 and will be inserted in orbit around comet 67P/Churyumov-Gerasimenko in 2014. One of its instruments, the Osiris Narrow Angle Camera (NAC), will take high-resolution images of the comet and map its nucleus as well as the jets of gas and dust emanating from localized areas. This is quite challenging as the contrast between the radiance of these jets and that of the nucleus is expected to be of the order of 1/1000. A major limitation comes from the presence of multiple ghosts which results from the presence of two filters and a protective window in front of the CCD detector. Rigorous knowledge of these instrumental ghost images is therefore required. We present analytical models of the structure and intensity of these ghosts, compare them with pre and post-launch observations, and describe image analysis tools developed to handle them.

Citation Download Citation

Kjetil Dohlen, Laurent Jorda, Philippe Lamy, Imre Toth, and Alain Origne "Analytic and experimental determination of ghosts in the Rosetta Narrow-Angle Camera and their impact on imaging performance", Proc. SPIE 7731, Space Telescopes and Instrumentation 2010: Optical, Infrared, and Millimeter Wave, 773149 (10 August 2010); https://doi.org/10.1117/12.857207

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available