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Contains:  IC 4701, IC 4715, Lagoon Nebula, M 20, M 24, M 8, NGC 6514, NGC 6523, NGC 6526, Part of the constellation Ophiuchus (Oph), Part of the constellation Sagittarius (Sgr), Small Sgr Star Cloud, The star 44Oph, The star 45Oph, The star Alnasl (γ2Sgr), The star Kaus Borealis (λSgr), The star Media (δSgr), The star Sabik (ηOph), The star θOph, The star μSgr, The star ξOph, The star ξSer, Trifid Nebula
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Fierce Dust Clouds in Milky Way, 


            Min Xie
Fierce Dust Clouds in Milky Way
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Fierce Dust Clouds in Milky Way

Technical card

Dates:April 25, 2020

Frames:Baader Moon & Sky Filter 2": 46x180" (gain: 4.00) -10C bin 1x1

Integration: 2.3 hours

Avg. Moon age: 2.18 days

Avg. Moon phase: 5.30%

Bortle Dark-Sky Scale: 2.00

Mean SQM: 21.99

Temperature: 8.00

Basic astrometry details job: 3465897

RA center: 17h 45' 37"

DEC center: -22° 44' 42"

Pixel scale: 39.704 arcsec/pixel

Orientation: 180.875 degrees

Field radius: 15.775 degrees

Resolution: 2412x1538

Locations: SPAC Dark Site, Guthrie, Texas, United States

Data source: Traveller


... Back to how it all started ...

It was a nice trip to West Texas over the new moon weekend. I brought along the ultra-widefield setup that has never been put into action. I Keep dreaming about maybe one day I can put all these into a backpack and go to the Southern part of the globe.

- AZ-GTi (controlled by SGP, a portable GOTO!)
- Sigma ART 50mm/f1.4
- AstroMechanics EF Focus Control Module (54mm)
- QHY168c

Pretty sure I made the mistake setting the gain way too low. Too few chances to visit the dark-site and have no idea what's the proper settings for the OSC. The plan was to shoot a 2-panel mosaic covering the Rho Ophiuchi. But failed to bring out the colors (definitely will try again!).

Not much processing done. Only Photoshop was used (except for the non-linear conversion - it was done in PixInsight). No flats, no darks, no biases were used to calibrate the raw frames.



Min Xie
License: Attribution-NonCommercial Creative Commons

Sky plot

Sky plot


Fierce Dust Clouds in Milky Way, 


            Min Xie