First time Antares split
Posted 14 July 2013 - 03:50 PM
It's never easy in S. Ontario with Antares barely making 15 degrees above the horizon. But seeing is MUCH more important than aperture for this pair. As a rule of thumb, if you can't see steady diffraction rings around the primary you won't glimpse the secondary.
Posted 14 July 2013 - 06:17 PM
Posted 14 July 2013 - 10:13 PM
Posted 16 July 2013 - 08:05 AM
Posted 16 July 2013 - 10:59 PM
Posted 21 July 2013 - 09:53 PM
I replied earlier this evening but it seems to have disappeared. Most likely a missed key. If 2 replies appear, my apologies.
Myself and other observers have tried UHC filters and have found out that some of them show a secondary reflection of a bright star which will make you think you split a double. I'd suggest you try the filter on a bright known single star and see what happens. I personally don't trust UHC filters for splitting doubles. Hopefully you've been able to split Antares.
Several years ago, I saw the exact same thing Rich describes with my 8 inch reflector using a Baader UHC filter--I cant remember which star exactly but do remember it was one that had a very bright primary (such as Antares).
This double is tricky for me even with the 15 inch. Early in the night I can easily see the secondary at 200x or so, but then later in the night I cannot (when conditions should be better). Oddly enough, if the seeing is very good, I can see the companion quite clearly at 150x with the 8 inch. It seems sky conditions are the most important factor for Antares. I seem to recall most of my positive sightings happening at the end of twilight versus in the deep dark of late night--maybe that is the trick?
I did make a very preliminary finding recently using an off axis mask with my 15 to afford an unobstructed 6 inch telescope in which the secondary appeared a bit better to see due to overall dimming of the primary.
Try as I may, I have not been able to obtain a good image of the secondary in any scope with any combination of lenses or camera conditions. Antares is ridiculously difficult to photograph.
You should keep trying this one, though, as you will may see the companion when you least suspect it.
back to matter at hand: we finally got clear skies here while I'm home. Guess what - I resolved Arcturus (red and green) with my UHC filter and ED102. :o So Rich and Mark, you are right and thanks for the heads-up. And sorry Ralph (a later poster), you should take another look...
So I'll keep trying - Antares is tough at 48* latitude, but one day it will clear up enough.
Posted 28 July 2013 - 12:54 AM
I caught the greenish companion in a clean black space split on a night of rare good seeing (P7-P8) three weeks ago, using my 5" refractor at 257x. At 180x I still had a black line split. No filters needed.
Definitely the view of the night!
Posted 28 July 2013 - 08:03 AM
Posted 28 July 2013 - 08:56 AM
I pegged the B star with a greenish tint, but it is so close to the red giant, I couldn't be sure.
I'll have to try it again.
Posted 30 September 2013 - 07:58 PM