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Contains:  IC 4605, NGC 6144, rho Oph nebula, IC 4604, IC 4603, M 4, NGC 6121, M 80, NGC 6093, The star τSco, The star ωOph, The star 22Sco, The star Antares (αSco), The star ρOph, The star Al Niyat (σSco), The star οSco, Part of the constellation Scorpius (Sco)
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Rho Ophiuchus Molecular Cloud Complex, 





    
        

            Michael Feigenbaum
Rho Ophiuchus Molecular Cloud Complex

Rho Ophiuchus Molecular Cloud Complex

Technical card

Imaging telescope or lens:Oshiro 135mm M58

Imaging camera:Nikon D5300

Mount:Celestron CGEM DX Hypertuned

Guiding telescope or lens:ZWO 30F4 Guidescope

Guiding camera:ZWO ASI290MM Mini

Software:Stark Labs PHD 2.6DSSPleiades Astrophoto PixInsight

Resolution: 5744x3712

Dates:June 8, 2019

Frames: 120x120" ISO800

Integration: 4.0 hours

Darks: ~50

Flats: ~50

Bias: ~50

Avg. Moon age: 5.50 days

Avg. Moon phase: 30.50%

Mean SQM: 20.90

Temperature: 26.00

Astrometry.net job: 2760556

RA center: 246.493 degrees

DEC center: -25.095 degrees

Pixel scale: 5.942 arcsec/pixel

Orientation: 91.859 degrees

Field radius: 5.645 degrees

Locations: Papago Butte, near Maricopa, AZ, United States

Data source: Backyard

Description

A favorite area of the sky for me... I had to try to do this one again. On this I used a rather economical Oshiro 135mm lens and a Nikon D5300.

The lens is f2.8 fully open. I sort of stopped it in between detents at about f3.4 to minimize vignetting and I was pleased that I did not get bad diffraction spikes. But was really surprising was that I did not get CA. I do not know why as this is not an apo lens and is not even advertised as being an ED lens.

Of course, any comments and/or criticism always appreciated!

CS to all,
Mike

Comments

Author

MikeF29
Michael Feigenbaum
License: None (All rights reserved)
2484
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Revisions

  • Rho Ophiuchus Molecular Cloud Complex, 





    
        

            Michael Feigenbaum
    Original
  • Final
    Rho Ophiuchus Molecular Cloud Complex, 





    
        

            Michael Feigenbaum
    C

C

I was dissatisfied with this image because there seemed to be no reds in there, at least not what I expected. I reprocessed and did a 2x drizzle which I believe helps with the inherent undersampling. And then some reds appeared. I suspect the original problem was in DBE. But anyway, here is a new revisions which I hope is an improvement over the original.

Sky plot

Sky plot

Histogram

Rho Ophiuchus Molecular Cloud Complex, 





    
        

            Michael Feigenbaum

In these public groups

Cloudy Nights
Fast Newtonians