A surprise came when aligning the OIII layer with the RGB using "difference" blending: a tiny green spot appeared near 1295 that had a central star (only in the negative combination)... the OIII image is sharper than the RGB so the ring disappears in the combination, but the green color is vivid. The only info I could find other than the NED ID of *PN G025.3-04.6* suggested a magnitude of 5.5 or so, which looks visually about correct. At my focal length, it is only slightly beyond stellar in size. The cluster, ngc 6712, is mostly older, metal-rich stars so it is a bit golden, nice in the crowded field of Scutum... ic 1295 is all but invisible in the RGB frames, but really responds to the O-III filter.. you can |
Telescope |
Explore Scientific David H. Levy Comet Hunter Maksutov-Newtonian 152mm f/4.8 mounted piggyback on Meade LX 200 Classic 12 inch. See the setup here: https://artistsloft.com/astro/44pounds.html |
Camera | Canon XT/350d modified with Baader type 1 filter by Hap Griffin |
Exposure | 48 three-minute sub-exposures at iso 800 with 6 ten-minute subs in O-III. total of 108 minutes. |
Guiding | PHD Guide from Stark labs with Meade DSI pro I on Meade 12-inch LX 200 Classic at f/3.3 |
Software | Images acquired, calibrated, stacked and color corrected with Nebulosity 2.2.4 from Stark Labs. Further processing in Photoshop CS 3. |
on-line links to more information | nothing substantial, google will give some... |