Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aas...18110106m&link_type=abstract
American Astronomical Society, 181st AAS Meeting, #101.06; Bulletin of the American Astronomical Society, Vol. 24, p.1282
Astronomy and Astrophysics
Astronomy
Scientific paper
We will present a design for an Inverted Cassegrain (INCA) reimaging camera designed to relay an f/9 telescope beam onto a 2048 x 2048, 15 microns pixel CCD. As of this writing, our working design utilizes a 250 mm, f/1.1 primary mirror, a 37.5 mm, f/3.6 secondary mirror, and an 87 mm, f/3.8 field lens to produce a demagnification of 2:1. The on-axis obscuration in the system will be about 18%. The motivation for this camera is two-fold. First, it provides an image scale and large field size which more effectively utilize the large, recently available 2048 x 2048 Loral CCD detectors. This way of gaining field is less costly than assembling a mosaic of four, or more, detectors, and is better for narrowband work than a fast Schmidt telescope because it permits placing narrow bandpass filters in the slow f/9 beam. Second, the camera permits a coronagraphic mode, where the pupil is at the secondary mirror. The mostly reflective design also minimizes chromatic aberration, which permits imaging with broadband filters, maximizes UV throughput, and minimizes internal reflections which are inherent in fast, multilens, refractive relays. This is one of several designs being considered for use on the Steward Observatory's 90-inch, f/9, and 61-inch, f/13.5 telescopes. With these telescopes the camera would give a field size of 14.5' with resolution of 0.30'' per pixel.
Hester Jeff J.
Marcus David A.
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