Roll Angle System (RAS) for the High-Energy Solar Spectroscopic Imager HESSI

Reinhold Henneck; Jacek Bialkowski; F. Burri; Martin Fivian; W. Hajdas; A. Mchedlishvili; P. Ming; Knud Thomsen; J. Welte; Alex Zehnder; M. Dettwyler; F. Buerki; Gordon J. Hurford; David W. Curtis; David H. Pankow

doi:10.1117/12.366530

22 October 1999 Roll Angle System (RAS) for the High-Energy Solar Spectroscopic Imager HESSI

Reinhold Henneck, Jacek Bialkowski, F. Burri, Martin Fivian, W. Hajdas, A. Mchedlishvili, P. Ming, Knud Thomsen, J. Welte, Alex Zehnder, M. Dettwyler, F. Buerki, Gordon J. Hurford, David W. Curtis, David H. Pankow

Author Affiliations +

Proceedings Volume 3765, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy X; (1999) https://doi.org/10.1117/12.366530
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1999, Denver, CO, United States

Abstract

The purpose of the HESSI RAS is to provide information on the roll angle of the rotation spacecraft. Precise knowledge of the roll angle is a necessary ingredient for image reconstruction. The RAS is a continuously operating star scanner that points out radially and observes stars at 75 degrees from the Sun direction using a commercial lens and a fast CCD. The passage of a star image over the CCD charges one or several pixels above threshold and the timing of this signal defines the roll angle, once the star has been identified by comparing its pixel position and amplitude with a star map. Roll angles at intermediate times are inferred by assuming uniform rotation. With a limiting star magnitude of m_v equals 3 we expect to observe at least 1 star per revolution over 1 year; on the average we will detect about 10 stars/revolution.

Citation Download Citation

Reinhold Henneck, Jacek Bialkowski, F. Burri, Martin Fivian, W. Hajdas, A. Mchedlishvili, P. Ming, Knud Thomsen, J. Welte, Alex Zehnder, M. Dettwyler, F. Buerki, Gordon J. Hurford, David W. Curtis, and David H. Pankow "Roll Angle System (RAS) for the High-Energy Solar Spectroscopic Imager HESSI", Proc. SPIE 3765, EUV, X-Ray, and Gamma-Ray Instrumentation for Astronomy X, (22 October 1999); https://doi.org/10.1117/12.366530

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

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
6 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Stars

Charge-coupled devices

Sun

Imaging systems

Reflectivity

Satellites

Imaging spectroscopy

Show All Keywords

Keywords/Phrases

Search In:

Publication Years