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Hemisphere:  Southern  ·  Contains:  IC 4603, IC 4604, IC 4605, M 4, NGC 6121, Part of the constellation Scorpius (Sco), The star 22Sco, The star Al Niyat (σSco), The star Antares (αSco), The star οSco, The star ρOph, The star τSco, The star ωOph, rho Oph Nebula
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Rho Ophiuchi, 


            Hypatia Demeter A...
Rho Ophiuchi
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Rho Ophiuchi

Technical card

Imaging telescopes or lenses: Pentax 135mm f2.5

Imaging cameras: Canon EOS 100D / Rebel SL1

Mounts: SkyWatcher Star Adventuer

Dates:May 13, 2020July 21, 2020


Integration: 0.9 hours

Avg. Moon age: 10.98 days

Avg. Moon phase: 30.75%

Bortle Dark-Sky Scale: 4.00

Basic astrometry details job: 3694273

RA center: 16h 26' 7"

DEC center: -24° 44' 31"

Pixel scale: 6.551 arcsec/pixel

Orientation: 0.343 degrees

Field radius: 5.032 degrees

Resolution: 3348x4401

Locations: Backyard, Santa Fe, New Mexico, United States

Data source: Backyard


The Rho Ophiuchi molecular cloud complex in Scorpius. captured 30x70" with my new Pentax super-takumar 135 on July 21 hoping to compare it to the images produced by my Pentax-k 135. unfortunately my mount died before I could get a full hour in on the target so I decided to combine this data with data I captured back in May. The verdict is that the Takumar is slightly sharper and better corrected for chromatic abberation, but it comes at the cost of less light gathered and coma in the corners. I will likely use both lenses going forward, perhaps this could be the birth of a dual imaging setup down the road.

canon rebel sl1, skywatcher star adventure
30x70" pentax super-takumar 135/3.5 @ f/~4.5 captured 7-21-20
14x90" pentax-k 135/2.5 @ f/3.6 captured 5-13-20



Hypatia Demeter A...
License: None (All rights reserved)

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Sky plot


Rho Ophiuchi, 


            Hypatia Demeter A...