RE: [Utah-astronomy] Fwd: Rigel and companion
I've never had difficulty with Rigel with an "unmasked" 10-inch f5 Newt. If I can't make out the companion, I wait an hour for the position to change and to see if it was lost in the glare of one of the diffraction spikes from the secondary, or I try rotating the tube assembly. Even with bright diffraction spikes, Rigel's companion hasn't been difficult for me. Not so for other pairs I've tried observing that way. I believe that the same principle behind the "apodizing" mask makes observing close doubles easier with a SCT than with a quality refractor of comparable aperture. This was apparent one night in May 2001 while observing Eta Cor Bor with both Don Colton's Ultima 2000 (Celestron 8-inch SCT) and Siegfried's 9-inch Clark. The large central obstruction of the SCT in effect made the Airy disk proportionately smaller than that in the Clark and allowed the pair (0.8 arcsec, as I recall) to be split easily. At the same time, I couldn't split the pair in the Clark, nor I believe could anyone else. (I was so impressed by the performance of the Ultama 2000 that two weeks later I bought one myself. Siegfried wouldn't part with the Clark for the same price, although I offered...) -----Original Message----- From: UTAHDEB@aol.com [mailto:UTAHDEB@aol.com] Sent: Monday, October 13, 2003 1:14 PM To: utah-astronomy@mailman.xmission.com Subject: Re: [Utah-astronomy] Fwd: Rigel and companion Joe, According to the Astro-League's Double Star list, the separation is 9.5 arc seconds and the PA is 202 degrees. The primary star is 0.1 mag and the secondary star is 6.8 magnitude. Rigel was my first observed double when I bought my 4 inch refractor back in 2001. I'll try to take a picture of Rigel this winter with my digital camera. I don't know if more vanes could help. Debbie _______________________________________________ Utah-Astronomy mailing list Utah-Astronomy@mailman.xmission.com http://mailman.xmission.com/cgi-bin/mailman/listinfo/utah-astronomy
I can normally split Rigel with a 6" newt. Some nights, however, the seeing isn't good enough. I normally have so little poroblem with it that I could easily show it to teachers who were the recipients of 6" f10 scopes. I do not consider it to be too difficult. It is in my first finder chart book. The position angle and separation are not changing much. The Hipparchos catalog shows a distance of 773 light years, and the actual separation is abut 2250 a.u. I think the difficulty Debbie mentions is one of photographing it, not of observing it. BTW, great shot Debbie. Brent __________________________________ Do you Yahoo!? The New Yahoo! Shopping - with improved product search http://shopping.yahoo.com
Hi friends, just a quick note to let you know I finally got a picture into my utahastronomy album that I wanted to show you. It's a Saturn view. Also I uploaded a better pic of Mars. Neither of these is as good as some of the others on the site, but they're OK for stacked views taken in downtown Salt Lake City. Thanks, Joe Joe Bauman science & military reporter Deseret News bau@desnews.com (801) 237-2169
Joe, Have you got RegiStax? It'll help you stack and align many more frames quickly and also do some fairly specific mask filtering. Cheers David ----- Original Message ----- From: "Joe Bauman" <bau@desnews.com> To: "Visit http://www.utahastronomy.com for the photo gallery." <utah-astronomy@mailman.xmission.com> Sent: Tuesday, October 14, 2003 7:49 AM Subject: [Utah-astronomy] Saturn
Hi friends, just a quick note to let you know I finally got a picture into my utahastronomy album that I wanted to show you. It's a Saturn view. Also I uploaded a better pic of Mars. Neither of these is as good as some of the others on the site, but they're OK for stacked views taken in downtown Salt Lake City. Thanks, Joe
Joe Bauman science & military reporter Deseret News bau@desnews.com (801) 237-2169
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Hi all, Just so ya know, starting Friday I'm going out of town and will be gone until the following Thursday, the 23rd. So I hope the list doesnt explode when I'm gone. :) I'm going to go no-mail today so I don't forget. Take care! Cyn -- http://www.utahdogs.com http://www.cynthiablue.net
Hope you have a great trip Cynthia...headed south? db On Wednesday, October 15, 2003, at 07:52 AM, Cynthia Blue wrote:
Hi all, Just so ya know, starting Friday I'm going out of town and will be gone until the following Thursday, the 23rd. So I hope the list doesnt explode when I'm gone. :) I'm going to go no-mail today so I don't forget.
Take care! Cyn
-- http://www.utahdogs.com http://www.cynthiablue.net
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Hi, actually, I used RegiSax -- I seemed to get better results when I went through the BMPs individually, in RegiStax, and threw out the fuzziest ones. I would like someday to take a video from a good, still, dark site instead of the city, which I believe would improve the resulting image. But I need to get a laptop for that. Thanks again, Joe Joe Bauman science & military reporter Deseret News bau@desnews.com (801) 237-2169
participants (6)
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Brent Watson -
Cynthia Blue -
David L Bennett -
Joe Bauman -
Kim Hyatt -
Naz & David