[AZ-Observing] Re: I split Sirius tonight
- From: "Richard Harshaw" <rharshaw2@xxxxxxx>
- To: <az-observing@xxxxxxxxxxxxx>
- Date: Mon, 18 Feb 2008 06:36:36 -0700
Paul, I split the pair in the 1980's apestron with an 8-inch SCT using a
hexagonal objective mask. The mask was made to fit just inside the retainer
ring, and the thickness of the mask at the vertices was about one inch, so
it was 6 inches in diagonal. The mask breaks up the incoming light of a
central-obstruction telescope and piles it into six "spokes". I rotated the
mask until two spokes bracketed the companion and there, with no diffraction
rings to mask it now, was the Pup.
Dick H
-----Original Message-----
From: az-observing-bounce@xxxxxxxxxxxxx
[mailto:az-observing-bounce@xxxxxxxxxxxxx] On Behalf Of Paul Lind
Sent: Sunday, February 17, 2008 11:56 PM
To: az-observing@xxxxxxxxxxxxx
Subject: [AZ-Observing] Re: I split Sirius tonight
Steve,
Way to go, fantastic. You are the only person I know that has done this
using a "small" scope. Do you know anyone who has used an apodizing mask to
help separate Sirius' companion? I think a rectangular mask has been used
with the narrow dimension facing the companion. I'm not sure how wide the
mask opening should be, or whether it should be a series of wide slits.
Paul
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