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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 22Sco, The star Antares (αSco), The star ρOph, The star Al Niyat (σSco), The star οSco, The star 12Sco, The star 13Sco, Part of the constellation Scorpius (Sco)
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Rho Ophiuchi, 


            Eric Cauble
Rho Ophiuchi

Rho Ophiuchi

Technical card

Imaging telescope or lens:Samyang 135mm f/2 ED

Imaging camera:QHYCCD QHY168C

Mount:iOptron CEM25P

Guiding telescope or lens:ZWO 30F4 Guidescope

Guiding camera:ZWO ASI 120MM

Software:Sequence Generator Pro SGPPixInsightPHD2

Filter:Optolong UV/IR Cut

Resolution: 4890x3226

Dates:March 7, 2019

Frames:Optolong UV/IR Cut: 33x120" (gain: 9.00) -20C bin 1x1

Integration: 1.1 hours

Darks: ~10

Flats: ~12

Bias: ~15

Avg. Moon age: 0.76 days

Avg. Moon phase: 0.64%

Bortle Dark-Sky Scale: 4.00

Temperature: 1.11 job: 2575025

RA center: 247.688 degrees

DEC center: -25.297 degrees

Pixel scale: 7.577 arcsec/pixel

Orientation: 19.918 degrees

Field radius: 6.164 degrees

Locations: Sadlers Creek State Park, Anderson, South Carolina, United States

Data source: Traveller


My first successful attempt at Rho Ophiuchi. I've tried several times and have either been foiled by clouds or equipment issues. I took 52 subs but had to reject 19 because of clouds. Hopefully I can add a few more hours integration. Rho Oph is tied with the Witchhead for my favorite reflection nebula.



Eric Cauble
License: Attribution-NonCommercial-ShareAlike Creative Commons

Sky plot

Sky plot


Rho Ophiuchi, 


            Eric Cauble