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Contains:  M 83, NGC 5236
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M83 Southern Pinwheel, 


            Chen Wu
M83 Southern Pinwheel
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M83 Southern Pinwheel

Technical card

Imaging telescopes or lenses: Celestron EdgeHD 8

Imaging cameras: ZWO ASI1600MM Cooled PRO

Mounts: iOptron CEM 60

Guiding telescopes or lenses: ZWO OAG

Focal reducers: Celestron .7x Focal Reducer, for 8 HD

Software: Adobe Phosotshop CC  ·  Sequence Generator Pro Main Sequence Software  ·  AstroPixel Processor  ·  PixInsight

Filters: Astrodon R Gen 2 E-series 31mm  ·  Astrodon G Gen 2 E-series 31mm  ·  Astrodon B Gen 2 E-series 31mm  ·  Astrodon L Gen 2 E-series 31mm

Accessory: iOptron iPolar  ·  Moonlite LiteCrawler

Dates:June 1, 2019June 7, 2019June 29, 2019

Astrodon 31mm 3nm HA: 18x180" (gain: 139.00) -20C bin 1x1
Astrodon B Gen 2 E-series 31mm: 19x60" (gain: 76.00) -20C bin 1x1
Astrodon G Gen 2 E-series 31mm: 18x60" (gain: 76.00) bin 1x1
Astrodon L Gen 2 E-series 31mm: 220x30" (gain: 76.00) -20C bin 1x1
Astrodon R Gen 2 E-series 31mm: 19x60" (gain: 76.00) -20C bin 1x1

Integration: 3.7 hours

Darks: ~50

Flats: ~20

Avg. Moon age: 19.33 days

Avg. Moon phase: 12.70%

Bortle Dark-Sky Scale: 3.71

Temperature: 21.71

Basic astrometry details job: 2981001

RA center: 13h 36' 59"

DEC center: -29° 52' 12"

Pixel scale: 0.356 arcsec/pixel

Orientation: 158.094 degrees

Field radius: 0.387 degrees

Resolution: 4094x3274

Locations: Houston Astronomical Society Dark Site, Columbus, TX, United States; X Bar Ranch, Eldorado, TX, United States

Data source: Traveller


Since March, I have been seeking for a TFS-S replacement as 2032mm plus ASI1600MM cause too much over sampling. The new gadget shall be of crayford style, work with the reducer and can leave some space for a rotater. An electric rotater might sound luxury, but tilting caused by rotating, framing or meridian flip makes this choice a must.

This trip was made after I acquired a LightCrawler, which comes with a focuser with rotator function. This is the only product I know of that supports the EdgeHD 8 reducer at its 105mm back focus point. Though a big investment, never regretted.



Chen Wu
License: None (All rights reserved)


  • Final
    M83 Southern Pinwheel, 


            Chen Wu


Description: Retouched by Joe Hua

Sky plot

Sky plot


M83 Southern Pinwheel, 


            Chen Wu