Here is an image of M22 I grabbed last night after giving up on Jupiter due to the poor seeing. The image has been resampled from the original 3000 x 2000 pixels, cropped and saved as a 40% compression jpg.
From Starry Night Pro.
M22 is a magnitude 5.09 Globular cluster in the Constellation of Sagittarius, The Archer. The angular size is 24 arc minutes.
Globular clusters are densely packed balls of stars. From 50 000 up to 2 000 000 stars are bound together in a sphere with a radius of no more than 100 light years. All of the Milky Way’s globular clusters are ancient, up to 15 billion years old. At least 149 globular clusters in the Milky Way have been discovered, and more than 100 are in the NGC-IC catalog. Their distribution forms a spherical halo, centred on the core of our Milky Way.
According to SkyTools, there is a small planetary in M22 as follows:
GJJC 1
Planetary Nebula
aka PN G009.8-07.5
RA: 18h36m23.4s, Dec: -23°55'20" (2000) in Sagittarius
Magnitude: 15.00
Size: 8.5"
Unfortunately, I cannot locate it in my image as the stellar population is too dense.
Image details:
Celestron C9.25 with f6.3 focal reducer.
Pentax *istDS DSLR camera.
10 x 30 sec exposures.
Suburban Brisbane.
24th April 2006
Aligned and stacked in ImagesPlus.
http links:
SNP:
http://www.starrynight.com/
SkyTools:
http://www.skyhound.com/skytools.html
ImagesPlus:
http://www.mlunsold.com/menu.html
This was my first serious effort at imaging through the C9.25 with the Pentax *istDS and it is a much more difficult undertaking than using the smaller, more automated and software integrated, SBIG ST7e ccd camera.
Cheers
Dennis
