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Astronomical Optics, 2nd Edition
book

Astronomical Optics, 2nd Edition

by Daniel J. Schroeder
September 1999
Intermediate to advanced content levelIntermediate to advanced
478 pages
21h 54m
English
Academic Press
Content preview from Astronomical Optics, 2nd Edition
10.3.
The Near Perfect Image 257
and 0.246 for the apertures with
£
= 0 and s = 0.33, respectively, hence a smaller
Airy disk roughly compensates for the smaller encircled energy fraction.
For another example assume a passband of lOOnm centered at
A
= 550 nm,
and a star of apparent magnitude 25 imaged by HST. In this case we find a photon
flux of
4.03
photons/sec passing through the HST aperture and 2.63 photons/sec
on the Airy disk. Assuming a reflectance of 0.9 for the primary and secondary
HST mirrors, a more accurate flux value is approximately 2.1 photons/sec for a
star of apparent magnitude 25 at the //24 focus of HST. The detected photo ...
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Publisher Resources

ISBN: 9780126298109