Fairly bright and no HA signal to speak of. A bit of a new challenge for the CMOS camera and I decided to try drizzling the images to squeak out some more detail.
At the end of the day I prefer the drizzled version: more and better stars and more detail in the PN... but it took 5 times the processing time.
Abell 57 GENERAL NOTE ON ABELL (and other) PLANETARY NEBULA>>>>>>>>>>>>>
From Wikipedia:
The Abell Catalog of Planetary Nebulae was created in 1966 by George O. Abell and was composed of 86 entries thought to be planetary nebulae that were collected from discoveries, about half by Albert George Wilson and the rest by Abell, Robert George Harrington, and Rudolph Minkowski. All were discovered before August 1955 as part of the National Geographic Society – Palomar Observatory Sky Survey on photographic plates created with the 48-inch (1.2 m) Samuel Oschin telescope at Mount Palomar. Four were later rejected as not being planetaries: Abell 11 (reflection nebula), Abell 32 (red plate flaw), Abell 76 (ring galaxy PGC 85185), and Abell 85 (supernova remnant CTB 1 and noted as possibly such in Abell's 1966 paper). Another three were also not included in the Strasbourg-ESO Catalogue of Galactic Planetary Nebulae (SEC): Abell 9, Abell 17 (red plate flaw), and Abell 64. Planetaries on the list are best viewed with a large aperture telescope (e.g. 18-inch (0.46 m)) and an OIII filter.
It turns out to my surprise most of these are visible with my Stellarvue 130mm (5-inch) SVX.
Bottom line there are 79 imagable Abell Nebula of which I have imaged all one way or another.
This is my collection:
Planetary Nebula (Abell)These are sorted by number and behind the Abell's are other miscellaneous PNs that I have imaged... I have a list of the 100 brightest.
This is Jerry Macon's outstanding Abell Collection:
Jerry Macon's Abell CollectionThese are some useful Abell relevant sites:
The Astrobin Abell Group with 400 images sorted by TagColor and IMHO Best Filter InformationImages by Season and More Filter information in German
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