Placidus
20-10-2014, 02:30 PM
Paul's lovely wide-field shot of the same area came through while this was uploading. BassNut (Fred) also has a superb and even deeper shot of the same area, but ours goes a bit further to the right.
There are two rather beautiful and intensely bright ring structures. The green one at left, bright in H-alpha, is part of NGC 2040, and shows tangled concentric shock fronts. The blue one at lower right is NGC 2020 and is strong in OIII. Also beautiful is the green brain-coral-like frothy structure at bottom right, sadly a bit cropped, also bright in H-alpha. There are many other tendril-like wispy structures throughout the image.
H-alpha (green) 4hrs, OIII (blue) 4hrs, SII (red) 3hrs, all in 1hr unbinned subs.
Unexpectedly got a bit of nasty field rotation about a point toward top right - an occupational hazard of long subs in the deep south.
The very strong saturation in the image is very typical for the Greater Magellanic Cloud, due to near total topographical separation between regions glowing strongly in OIII due to harsh UV, and other more dense but perhaps less harshly irradiated regions, glowing strongly in H-alpha. There is very little SII in this image.
Aspen 16M on 20" PlaneWave.
Best,
Mike n Trish
There are two rather beautiful and intensely bright ring structures. The green one at left, bright in H-alpha, is part of NGC 2040, and shows tangled concentric shock fronts. The blue one at lower right is NGC 2020 and is strong in OIII. Also beautiful is the green brain-coral-like frothy structure at bottom right, sadly a bit cropped, also bright in H-alpha. There are many other tendril-like wispy structures throughout the image.
H-alpha (green) 4hrs, OIII (blue) 4hrs, SII (red) 3hrs, all in 1hr unbinned subs.
Unexpectedly got a bit of nasty field rotation about a point toward top right - an occupational hazard of long subs in the deep south.
The very strong saturation in the image is very typical for the Greater Magellanic Cloud, due to near total topographical separation between regions glowing strongly in OIII due to harsh UV, and other more dense but perhaps less harshly irradiated regions, glowing strongly in H-alpha. There is very little SII in this image.
Aspen 16M on 20" PlaneWave.
Best,
Mike n Trish