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I agreeImaging telescope or lens:Lacerta Photonewton 250/1000
Imaging camera:ZWO ASI 183MM Pro
Mount:Orion HDX110 EQ-G
Guiding telescopes or lenses:Lacerta Photonewton 250/1000 , 60mm Guidescope
Guiding camera:Orion Starshoot autoguider
Focal reducer:GPU Coma Corrector (4-element)
Software:Photoshop CC , PixInsight , DeepSkyStacker (DSS) 3.3.2 , FITS Liberator , PHD2 Guiding Software
Filters:Astrodon B Gen2 E-Series 36mm , Astrodon G Gen2 E-Series 36mm , Astrodon R Gen2 E-Series 36mm , Baader SII 36mm Filter 8nm , Astrodon 5nm OIII 36mm
Accessory:ZWO EFW 7 x 36mm
Dates:Sept. 18, 2019 , Oct. 6, 2019 , Oct. 24, 2019 , Oct. 26, 2019 , Nov. 4, 2019
Frames:
Astrodon 5nm OIII 36mm: 47x300" (gain: 200.00) -10C bin 1x1
Astrodon B Gen2 E-Series 36mm: 256x30" (gain: 200.00) -10C bin 1x1
Astrodon G Gen2 E-Series 36mm: 220x30" (gain: 200.00) -10C bin 1x1
Astrodon R Gen2 E-Series 36mm: 240x30" (gain: 200.00) -10C bin 1x1
Baader SII 36mm Filter 8nm: 47x300" (gain: 200.00) -10C bin 1x1
Integration: 13.8 hours
Avg. Moon age: 17.45 days
Avg. Moon phase: 42.90%
Astrometry.net job: 3258171
RA center: 23h 23' 24"
DEC center: +58° 48' 46"
Pixel scale: 0.495 arcsec/pixel
Orientation: 359.230 degrees
Field radius: 0.210 degrees
Resolution: 2496x1758
Locations: Los Alamos, Los Alamos, New Mexico, United States; Abiqui Lake, Abiqui, New Mexico, United States
Data source: Traveller
Cassiopeia A (Cas A) supernova remnant, one of the best studied objects in the sky at all wavelengths, but rarely imaged by amateur astronomers due to its small size and low brightness. This image is a combination of narrowband (OIII and SII) and RGB data taken over several nights in September-November 2019 with 250mm f/4 Lacerta Photonewton and ASI183MM Pro camera. The individual narrowband and broadband exposures were taken at camera gain 200. To reduce the effect of bad seeing, final RGB images were constructed from a series of short (30 s) exposures with FWHM<3.0". The synthetic luminance was produced using SII, OIII and RGB data. R and B color channels are a blend of the broadband and narrowband images: R(R and SII) and B(B and OIII).
OIII: 47x300s (Gain 200, bin 1x1)
SII: 47x300s (Gain 200, bin 1x1)
R: 240x30s (Gain 200, bin 1x1)
G: 220x30s (Gain 200, bin 1x1)
B: 256x30s (Gain 200, bin 1x1)
Total exposure: 13.8 hours
Description: Closeup view
| Fast Newtonians |
| ZWO ASI183/QHY183 |
| CMOS Imagers |
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