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Contains:  IC 4605, rho Oph nebula, IC 4604, M 4, NGC 6121, IC 4592, The star ω1Sco, The star ρSco, The star θOph, The star τSco, The star Al Niyat (σSco), The star πSco, The star Graffias (β1Sco), The star Sabik (ηOph), The star Dschubba (δSco), The star Antares (αSco), Part of the constellation Scorpius (Sco), Part of the constellation Ophiuchus (Oph)
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Rho Ophiuchi and Jupiter, 





    
        

            Anthony Quintile
Rho Ophiuchi and Jupiter

Rho Ophiuchi and Jupiter

Technical card

Resolution: 6028x4024

Dates:June 7, 2019

Integration: 0.0 hours

Avg. Moon age: 4.41 days

Avg. Moon phase: 20.41%

Astrometry.net job: 2798472

RA center: 250.076 degrees

DEC center: -23.729 degrees

Pixel scale: 15.534 arcsec/pixel

Orientation: 8.199 degrees

Field radius: 15.639 degrees

Locations: Doney Mountain Picnic Area, Wupatki National Monument, Flagstaff, AZ, United States

Data source: Traveller

Description

My goal with this photo was to capture Jupiter while it was near the Rho Ophiuchi Nebula and neighbors. I was excited to also capture Callisto at 2:00 next to Jupiter, I think M4 is pretty good, considering the focal length, and, given the short exposure, I was glad to get some of the Blue Horsehead. I was also glad that M80 turned out to be a star cluster and not something I screwed up in processing.

This was my first real effort with a guided SLR lens shot, (as opposed to a telescope). I was hopeful that the “vintage” Pentax lens I bought for $30 would deliver, and I really feel it did! This image is uncropped, and although it has some distortion in the corners, I think it is pretty acceptable.

This image was shot at Doney Mountain Picnic Area near Wupatki National Monument. The bottom right corner was showing light pollution from Flagstaff. It took a lot of work in processing to get that part of the sky relatively neutral, but I learned a few new tricks. It’s still not perfect. I did learn that widefield AP is far more susceptible to light pollution gradients, which is obvious I guess, but I hadn’t dealt with this yet.

SMC Pentax-A 50mm F/1.4 at F/4 and Pentax K3 II
Losmandy G11 Gemini 2
Guided with ASIAir, (PHD2?), ASI120MM Mini, ZWO 280mm guide scope.
3 hours 14 minutes, mostly 4 minute exposures, about a dozen 2 minutes, ISO 400.

Shot on the night of Friday, June 7th at Doney Mountain Picnic Area, near Wupatki National Monument, north of Flagstaff, AZ.
Processed with Deep Sky Stacker, Photoshop, GradientXterminator.

60 darks, a bunch of bias, no flats. (The flats seemed to be causing some sort of reversed vignetting? Either way, the image was improved I think without the flats.)

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AnthonyQ
Anthony Quintile
License: None (All rights reserved)
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Rho Ophiuchi and Jupiter, 





    
        

            Anthony Quintile