Hemisphere:  Southern  ·  Constellation: Canis Major (CMa)  ·  Contains:  The star ο1CMa
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Sharpless 308 in Canis Major, 


            Scott Tucker
Sharpless 308 in Canis Major
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Sharpless 308 in Canis Major

Technical card

Imaging telescopes or lenses: SkyWatcher Esprit 100 ED f/5.5 APO  ·  Celestron 9.25 SCT

Imaging cameras: ZWO ASI294MC Pro  ·  Atik 490EX monochrome

Mounts: Celestron CGX

Guiding cameras: ZWO ASI174Mini

Focal reducers: TS Photoline 0,79x reducer/flattener

Software: MaxIm DL Pro 6  ·  photoshop cc  ·  Pleiades Astrophoto PixInsight

Filters: IDAS NB1 Nebula Booster  ·  Optolong OIII 6.5nm 2"

Accessory: Starizona Hyperstar 9.25"

Dates:Feb. 24, 2019

IDAS NB1 Nebula Booster: 30x300" (gain: 120.00) -25C bin 1x1
Optolong OIII 6.5nm 2": 77x120" -20C bin 1x1

Integration: 5.1 hours

Avg. Moon age: 20.16 days

Avg. Moon phase: 70.50%

Basic astrometry details

Astrometry.net job: 2546586

RA center: 6h 54' 21"

DEC center: -23° 55' 30"

Pixel scale: 2.437 arcsec/pixel

Orientation: 91.959 degrees

Field radius: 0.717 degrees

Resolution: 1600x1390

Locations: Backyard, Tucson, AZ, United States

Data source: Backyard


Dual imaging setup: HyperStar C9.25" f/2.2 and Atik 490 mono with OIII filter for luminance, and Esprit 100 f/4.3 with ASI294 for color data, mounted side-by-side on a CGX mount. Taken from my backyard north of Tucson, aimed low back over the city. SQM was 19.6 toward the object. I was surprised how well this came out, though it could use more than 5 hours of exposure time.


Sky plot

Sky plot


Sharpless 308 in Canis Major, 


            Scott Tucker