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Astronomy and Cosmology
Astronomy and Astrophysics
Lateral offset from a centered star as measured at the focal plane
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[QUOTE="Benschu, post: 6637499, member: 692821"] [B]TL;DR Summary:[/B] At the focal plane, what is the distance from the centerline of an object laterally displaced from a star at local stellar distances? Reference: [URL]https://www.physicsforums.com/forums/astronomy-and-astrophysics.71/post-thread[/URL] Hello, I need a bit of help. My age and fading competence are showing (no complaints, just facing up to it). I have an optical SETI observatory in Panama with a 20" Newtonian and a piggybacked 14" Cassy. I wish to mask a portion of stellar Airy disks with an E-W wire on a small photometer aperture. This has been tested successfully with a 1 mil wire in a 15 mil photometer aperture for 20-minute observations, i.e., tracking is good. Clearly, the 1 mil wire is too large, but it's a start. I plan to electrochemically etch the wire to the needed diameter. I need to know the relationship for image offset from the optical centerline at the focal plane with respect to the lateral distance from a centered star. As for instance, at the focal plane, what is the distance from the centerline of an object 1 au laterally displaced from a star at 200 ly? I suspect that location is mostly overshadowed by the Airy disk, but there may yet be a useful compromise. Backup info: 20" f4 Newtonian with a ~2-meter focal length. The Boquete Optical SETI Observatory has been running continuously since 2009 having observed nearly 10,000 stars in search of pulsed laser signals. Glad to supply more info for anyone interested. A bit of help on this project will be greatly appreciated. Ben Schuetz [/QUOTE]
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Astronomy and Cosmology
Astronomy and Astrophysics
Lateral offset from a centered star as measured at the focal plane
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