Hemisphere:  Southern  ·  Constellation: Monoceros (Mon)  ·  Contains:  PK216-00.1
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Abell 18, 



    
        

            jerryyyyy
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Abell 18

Imaging telescopes or lenses: Stellarvue SVT 130T

Imaging cameras: SBIG STT 8300M

Mounts: Astro-Physics Mach1AP GTO CP4

Guiding telescopes or lenses: Stellarvue SVT 130T

Guiding cameras: SBIG STT 8300M

Software: Software Bisque TheSky X Professional  ·  photoshop  ·  Starnet ++  ·  CCDWare FocusMax V.4  ·  PixInsight  ·  Straton Destar 2.0  ·  Topaz Denoise AI  ·  3D LUT Creator  ·  Maxim DL  ·  EQMOD  ·  DC-3 Dreams ACP Observatory Control Software  ·  Astro-Physics Command Center (APCC) Software  ·  Annie's Astro Actions Version 7.0

Filters: Astrodon 3nm OIII 31mm  ·  Astrodon H-alpha 5nm

Accessory: Moonlite Nitecrawler 3.5  ·  Tolga Astro Alnitak Flat-Man Electroluminescent Flat Fielding Device


Dates:Feb. 7, 2021

Frames:
Astrodon 3nm OIII 31mm: 7x1800"
Astrodon H-alpha 5nm: 5x1800"

Integration: 6.0 hours

Avg. Moon age: 25.09 days

Avg. Moon phase: 20.68%


Astrometry.net job: 4209383

RA center: 6h 56' 14"

DEC center: -2° 53' 8"

Pixel scale: 1.222 arcsec/pixel

Orientation: 178.518 degrees

Field radius: 0.120 degrees


Resolution: 500x500

Locations: Stanford Faculty Observatory (Bortle 6 SQM 18.6), Stanford, California, United States

Data source: Own remote observatory

Remote source: Non-commercial independent facility

Description

I found nothing on this one on the web, but it was an interesting coloring exercise.

Mt PI script to do bi-color uses:

0.72 for G from O-III

0.88 for B from O-III [these G & B proportions give the correct teal color)

0.80 for R from H-Alpha

These result in a somewhat dull image (less then 100% luminosity, but right color proportions) however that is easily corrected with a GAME mask and HT.

Then I photometrically calibrated the image in PI for the B-version... I think the colors are correct. I think this basically gives the right colors for the stars in the image and aligns the rest of the color accordingly.

Images denoised with Topaz and stars fixed in Photoshop.

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 43 (half-way point Feb 6 2012).

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.

These are some useful Abell relevant sites:

Color and IMHO Best Filter Information

Images by Season and More Filter information in German

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