Abell 74
Abell 74 is a highly-evolved, and thus very faint, planetary nebula. It was discovered on photographic plates taken with the 48" Schmidt telescope at the Mount Palomar Observatory.
The first known visual observation was made on 3rd August 1986 by my great friend Dana Patchick using a 17.5" F4.5 reflector.
The OIII signal is significantly fainter than the Ha signal.
The first known visual observation was made on 3rd August 1986 by my great friend Dana Patchick using a 17.5" F4.5 reflector.
The OIII signal is significantly fainter than the Ha signal.
TARGET
Nomenclature: Abell 74
Right Ascension: 21:16:52.3
Declination: +24 08 51.79
Size: 828 arc seconds
Discovery: Unknown
EQUIPMENT USED
Twin APM TMB LZOS 152 refractors
10Micron GM2000 HPS mount
Twin QSI6120 CCD cameras
Astrodon filters
IMAGE CAPTURE
OIII 3nm: 62x900" bin 1x1
Ha 5nm: 63x900" bin 1x1
Red: 15x300 bin 1x1
Green: 14x300 bin 1x1
Blue: 14x300 bin 1x1
Total integration: 34 hours 50 minutes
Pixel scale: 0.530 arcsec/pixel
Field radius: 0.342 degrees
Capture dates: 17 August - 10 September 2023
Capture location: Fregenal de la Sierra, Spain
OIII 3nm: 62x900" bin 1x1
Ha 5nm: 63x900" bin 1x1
Red: 15x300 bin 1x1
Green: 14x300 bin 1x1
Blue: 14x300 bin 1x1
Total integration: 34 hours 50 minutes
Pixel scale: 0.530 arcsec/pixel
Field radius: 0.342 degrees
Capture dates: 17 August - 10 September 2023
Capture location: Fregenal de la Sierra, Spain
IMAGE PROCESSING
Pre-processing: CCDStack2, PixinSight
Post-processing: Photoshop CS2
Pre-processing: CCDStack2, PixinSight
Post-processing: Photoshop CS2
Ha image:
OIII image:
