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Planetary Nebula NGC 2022
NGC 2022 is a multi-shell planetary nebula just east of Orion's head. The Hubble Space Telescope page says it is 5000 light-years distant. I found no other distance estimate for it. I knew it had an inner oval that has some detail but poor seeing this night didn't let it show in my image. Most images show a rather faint outer halo that turned out rather bright cyan in my image. I'm not sure why as most show it more neutral in color. What I didn't expect was hints of a faint shell further out that is separated from the inner shells by a dark space. This is all right at the noise level of my image. Taken under my typical for this year, poor transparency, and with not enough frames it is pretty much lost in the noise. In fact much of what I show may be noise but I'm quite sure there is something there. I see hints of it in several on line images. Seems no one gives this one the time needed to bring it out.
There is a star embedded in the inner ring that even the Hubble image doesn't seem able to separate out. I could but then I lost the ring so gave up and left it as most show it, lost in the ring itself. The Hubble image is all over the net. The original is at: https://www.spacetelescope.org/images/opo9738c9/ (Link is messed up in my browser cut and paste it seems the only way to make it work). It is pseudo color using just a V filter (green) and a near IR filter to supply color. I assume the green filter was assigned blue and the IR filter red with a green made from an average of the two. The image has south at the top rather than north as my image is oriented. The star is barely visible (mainly its diffraction spikes) in the upper left corner of the bright ring. Interestingly the ring has its own bright area almost exactly opposite the star. It appears the ring also has its own bright area right where the star is located making it hard to tell if real or not. I vote for a symmetry here and both "corners" being brighter than the rest of the ring. I found nothing else with distance data in the image and no asteroids showed up so no annotated image was prepared. 14" LX200R @ f/10, L=4x10' RGB=2x10', STL-11000XM, Paramount ME Rick Last edited by WA0CKY : May 28th 16 at 07:43 AM. |
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Planetary Nebula NGC 2022
Rick,
I have imaged NGC 2022 several times but did not even know that there is an outer shell.... Maybe I'll try some longer exposures next winter. Stefan "WA0CKY" schrieb im Newsbeitrag ... NGC 2022 is a multi-shell planetary nebula just east of Orion's head. The Hubble Space Telescope page says it is 5000 light-years distant. I found no other distance estimate for it. I knew it had an inner oval that has some detail but poor seeing this night didn't let it show in my image. Most images show a rather faint outer halo that turned out rather bright cyan in my image. I'm not sure why as most show it more neutral in color. What I didn't expect was hints of a faint shell further out that is separated from the inner shells by a dark space. This is all right at the noise level of my image. Taken under my typical for this year, poor transparency, and with not enough frames it is pretty much lost in the noise. In fact much of what I show may be noise but I'm quite sure there is something there. I see hints of it in several on line images. Seems no one gives this one the time needed to bring it out. There is a star embedded in the inner ring that even the Hubble image doesn't seem able to separate out. I could but then I lost the ring so gave up and left it as most show it, lost in the ring itself. The Hubble image is all over the net. The original is at: https://www.spacetelescope.org/images/opo9738c9/ (Link is messed up in my browser cut and paste it seems the only way to make it work). It is pseudo color using just a V filter (green) and a near IR filter to supply color. I assume the green filter was assigned blue and the IR filter red with a green made from an average of the two. The image has south at the top rather than north as my image is oriented. The star is barely visible (mainly its diffraction spikes) in the upper left corner of the bright ring. Interestingly the ring has its own bright area almost exactly opposite the star. It appears the ring also has its own bright area right where the star is located making it hard to tell if real or not. I vote for a symmetry here and both "corners" being brighter than the rest of the ring. I found nothing else with distance data in the image and no asteroids showed up so no annotated image was prepared. 14" LX200R @ f/10, L=4x10' RGB=2x10', STL-11000XM, Paramount ME Rick -- WA0CKY |
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