Hello,
My observation planning software, SkyTools 3 Professional, listed Terzan 11 as the faintest of the 11 Terzan objects, at magnitude 16.4, with a size: 1.5 arc minutes. Then, for Terzan 11,
The Astronomy-Mall article writes the following …
“This is a brutally tough object. It was a weak glow in the 36" near two fairly faint stars visible on the Palomar Sky Survey Prints”
So I knew that I had a challenge on hand, under the suburban skies of Brisbane.
Images:
Main image: Full frame, down sampled from 1600x1200 to 1280x960
Image scale of 0.82 arcsec/pixel with FOV approx. 22’ x 16’
DSS Image: STScI(US) Second Generation DSS Red, downloaded via SkyTools
Imaging Details:
Brisbane, Qld, Australia, 3rd July 2010.
Tak Mewlon 180 F12 with x0.8 Reducer at an efl of 1728mm.
SBIG ST2000 and CFW10
L= 4x15 mins, R:G:B = 1x10 min each filter.
Notes:
This particular session revealed a few problems with my set up, attributable mainly to the sheer weight of the ST2000+CFW10. The combined weight of this camera and filter wheel causes flexure in my Crayford Focuser as well as slippage of the focuser tube. The slippage resulted in “fatter” stars as the evening progressed. I only noticed this at the end of the session where the colour images were noticeably out of focus compared to the initial luminance frame. Next time I’ll use some strong rubber bands to take up some of the weight of the camera/filter wheel assembly.
Terzan globulars:
Some background details on the Terzan globulars can be found here.
http://astronomy-mall.com/Adventures...ce/obscure.htm
http://natkobajic.netfirms.com/listTERZAN.html
This image would not have been possible without the generous sponsorship of Gerald via the loan of his ST2000 & CFW10! Thanks Gerald!
Cheers
Dennis