Cookie consent

AstroBin saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing AstroBin without changing the browser settings, you grant us permission to store that information on your device.

I agree
Contains:  IC 4605, NGC 6144, rho Oph nebula, IC 4604, IC 4603, M 4, NGC 6121, The star 22Sco, The star Antares (αSco), The star ρOph, The star Al Niyat (σSco), The star οSco
Getting plate-solving status, please wait...
Rho Ophiuchi Complex, Four Panel Mosaic, 


            Andrew Barton
Rho Ophiuchi Complex, Four Panel Mosaic

Rho Ophiuchi Complex, Four Panel Mosaic

Technical card

Resolution: 6222x4920

Dates:May 24, 2019

Frames: 538x60"

Integration: 9.0 hours

Avg. Moon age: 20.19 days

Avg. Moon phase: 70.22% job: 2739903

RA center: 246.630 degrees

DEC center: -25.034 degrees

Pixel scale: 2.929 arcsec/pixel

Orientation: 90.014 degrees

Field radius: 3.226 degrees

Locations: Duquesne, Pategonia, Arizona, United States

Data source: Own remote observatory

Remote source: Non-commercial independent facility


I have always loved the amazing variety in the Rho Ophiuchi cloud complex. It has blue reflection nebula, red emission nebula, dusty dark nebula and two globular clusters. My previous attempt at this region left me wanting more and was the inspiration for this project.

I took this four panel mosaic over four night ranging from late March to late May 2019. It is produced from the 538 exposures I decided to keep. This is my first attempt producing a mosaic and I am very happy with the results. I used the "synthetic star field" approach described in David Ault's Trapped Photons blog:

This is also my first significant project with a new small telescope, the Sky-Watcher EvoGuide 50mm APO paired with the Starizona EvoFF field flattener. I have been looking for a wide field lens and tried this combination after less then stellar results with a Rokinon 135. I am very happy with the flatness of the EvoGuide, EvoFF combination. Kudos to Sky-Watcher and Starizona for producing a high quality, moderately priced, wide field instrument.



Andrew Barton
License: Attribution Creative Commons

Sky plot

Sky plot


Rho Ophiuchi Complex, Four Panel Mosaic, 


            Andrew Barton