#64523 Apr 2, 2013
Yeap. It crosses the southern meridian around 01:30 AM.
???? 4/2/2013 23:19, ?/? chris1011@... ??????: >
> Where is Porrima now? Is it up this time of year?
> -----Original Message-----
> From: Anthony Ayiomamitis ayiomami@...
> To: ap-ug firstname.lastname@example.org mailto:ap-ug%40yahoogr
> Cc: ap-gto email@example.com
> Sent: Tue, Apr 2, 2013 3:18 pm
> Subject: [ap-gto] Re: [ap-ug] Sirius, Rigel, Castor
> Be careful with binary stars since they are an addictive preoccupation.
> It is something I used to pursue rather actively with my C14 and imaging
> them is fun as well when trying to get the right colours. If you would
> like a neat list with very helpful supplementary information such as
> separation and position angle, check the Astronomical League list at
> Nice work with these. How about Porrima next?
> ???? 4/2/2013 22:49, ?/? chris1011@...
> > Hi All,
> > Last night was clear and quite steady in the hour after sunset. I had
> > never seen the companion of Sirius before at my observatory, so I
> > swung the 8" EDF refractor into action, with 6mm and 4mm Zeiss Abbe
> > Ortho oculars.
> > Just after sunset in the deepening twilight I saw the Pup sitting
> > quite nicely removed from the primary, visible about 80% of the time
> > as the skiy steadiness ebbed and flowed. Even though the star is only
> > about 30 degrees above the horizon here, myself and Howard both saw it
> > almost immediately, off to the right side. A quick look at the star
> > chart confirmed that it was indeed the Pup.
> > What made it possible to see it visually was a little known accessory
> > that Valery Deryushin (Aries Optics) sent me some years back. This is
> > a special mirror diagonal with a variable prism that can be tuned to
> > exactly cancel out the atmospheric refraction, which is quite
> > noticeable at that low altitude.
> > In any case, I figured that if I could see it, I should be able to
> > image it. I put up my trusty STL11K camera and the very first shot at
> > 0.3 second exposure with a narrowband OIII filter showed the secondary
> > quite clearly. The attached image was taken with an H-a, OII and
> > normal Blue filter to achieve the RGB image. I also decided to image
> > Rigel, which has similar separation, and Castor, which is a closer
> > All images were processed in MaximDL, 100 seperate sub-second
> > exposures of each color stacked. The images were then scaled up by a
> > factor of 4.17.
> > Rolando
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