Hemisphere:  Southern  ·  Constellation: Scorpius (Sco)  ·  Contains:  IC 4603  ·  IC 4604  ·  IC 4605  ·  M 4  ·  M 80  ·  NGC 6093  ·  NGC 6121  ·  NGC 6144  ·  Part of the constellation Scorpius (Sco)  ·  The star 12Sco  ·  The star 13Sco  ·  The star 22Sco  ·  The star Al Niyat (σSco)  ·  The star Antares (αSco)  ·  The star οSco  ·  The star ρOph  ·  The star τSco  ·  rho Oph nebula
Getting plate-solving status, please wait...
Rho Ophiuchi, 


            Eric Cauble
Rho Ophiuchi
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Rho Ophiuchi

Technical card

Imaging telescopes or lenses: Samyang 135mm f/2 ED

Imaging cameras: QHYCCD QHY168C

Mounts: iOptron CEM25P

Guiding telescopes or lenses: ZWO 30F4 Guidescope

Guiding cameras: ZWO ASI 120MM

Software: SGP  ·  PHD2  ·  PixInsight

Filters: Optolong UV/IR Cut

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

Basic astrometry details

Astrometry.net job: 2575025

RA center: 16h 30' 45"

DEC center: -25° 17' 49"

Pixel scale: 7.577 arcsec/pixel

Orientation: 19.918 degrees

Field radius: 6.164 degrees

Resolution: 1824x1203

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.


Sky plot

Sky plot


Rho Ophiuchi, 


            Eric Cauble