Hemisphere:  Northern
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Medusa HA O3, 


            Mark Holbrook
Medusa HA O3
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Medusa HA O3

Technical card

Imaging telescopes or lenses: Celestron C14 Edge+Hyperstar

Imaging cameras: ZWO ASI 183MM Pro  ·  ASI 1600MM-C

Mounts: Paramount MX+  ·  Software Bisque Paramount ME II Paramount ME II

Software: Software Bisque TheSkyX Professional suite  ·  PixInsight 1.8 PixInsight version 1.8

Filters: Baader UV/IR-Cut  ·  Baader O3 F/2  ·  Baader HA f/2  ·  Optolong LRGB Green 31mm  ·  Optolong LRGB Blue 31mm  ·  Optolong LRGB Red 31mm  ·  Optolong LRGB Luminance 31 mm

Accessory: Thousand Oaks Optical Dew Controller 4 channel  ·  Technical Innovations Robofocus  ·  ZWO EFWmini (5 x 1.25″or 5 x 31mm)  ·  DewBuster Shorty Dew Shield

Basic astrometry details

Astrometry.net job: 2591843

RA center: 7h 28' 52"

DEC center: +13° 18' 57"

Pixel scale: 0.570 arcsec/pixel

Orientation: 270.121 degrees

Field radius: 0.411 degrees

Resolution: 4131x3157

Data source: Backyard


Unguided image using tandem mounted C14's with Hyperstar including ZWO EFW filter wheels on Paramount ME2.

60 second exposures on ZWO ASI183M at gain 53, offset 8
60 second exposures on ZWO ASI1600M O3 at gain 75, offset 50,

Total exposures on 183M : 660 Ha (16.1 Hours)
Total exposures on 1600M : 670 O3 (14.4 Hours)

All exposures dithered and drizzled final image (22.2 Hours Total)


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Mark Holbrook
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Sky plot

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Medusa HA O3, 


            Mark Holbrook