NGC 6572 - weird
Posted 31 October 2013 - 05:01 PM
Posted 31 October 2013 - 06:51 PM
NGC 6826, the "blinking" planetary in Cygnus, the most well known example.
Posted 31 October 2013 - 08:52 PM
This is what I think. Besides that, NGC 6572 is a fabulous onject to observe. The colour is beautiful.
Posted 31 October 2013 - 09:51 PM
Posted 31 October 2013 - 10:53 PM
It has never had a blinking effect. I think you get that with smaller aperature. I used my 15" Obsession telescope.
Next year, I'm going up to an 8000 foot observing site before the monsoon season.
Posted 01 November 2013 - 10:19 AM
Posted 01 November 2013 - 10:26 AM
Posted 01 November 2013 - 12:48 PM
Posted 01 November 2013 - 02:23 PM
Here is an observation with my old 13 inch Newtonian.
NGC 6572 13" f/5.6 Cherry Rd Seeing=6, Transparency=7 Bright, pretty large, elongated 1.5X1 in PA 135 using 220X. The central star is held steady in good seeing conditions. Other times the center will just brighten up somewhat. The noteworthy aspect of this gem is its' color. In every scope I have ever owned, from an 8" to an 18" this is the greenest nebula I have ever seen! This guy is as green as an Irishman's coat on St. Patrick's day. Alright, alright, it is as green as lime Jello.
Posted 09 November 2013 - 11:29 AM
On a clear night with 6572 overhead we did an experiment with 30 or so college kids that came out for a night of observing. Using a 12.5 f/5 we asked the group to look at the planetary and note it's color, but not to reveal their observation. After all were through they wrote done the color they saw. Of the 30, 20 saw it as greenish and 10 bluish. Most interesting of all is all of the girls (8) we're in the blue!
I see as bright green at low power and slightly more blue at higher powers. Interesting little object, this is why I do astronomy!
Posted 09 November 2013 - 12:13 PM
But I never saw the CS, even not with 27" under nearly perfect conditions (transparency and seeing). You can easily mix up the "false CS" with the very bright center of the PN.
27", 837x, no filter, NELM 7m+, Seeing II
Posted 09 November 2013 - 02:42 PM
Never noticed blinking on this planetary either.
Posted 09 November 2013 - 10:03 PM
Posted 10 November 2013 - 09:32 AM
Posted 07 December 2013 - 02:35 AM
The color perception at this PN is very different. I remember back when I saw this PN cyan to green with a 20" Dob. A month later we tried it with a 10" SC under bad conditions and all 6 observers saw the PN in a light blue. Don't ask me why. Later I revisit the PN with my 27" and a saw it again intensive cyan to green, even with 586x (AP 1,2mm).
Uwe, I've noted this color change also, and in the same observation!
18" (8/2/05): at 225x I noticed an interesting color effect; although the color was a quite prominent bluish-green, while staring at the center the planetary decreased in size and the color changed to a deep emerald green.