Hemisphere:  Southern  ·  Constellation: Ophiuchus (Oph)  ·  Contains:  IC 4603  ·  IC 4604  ·  IC 4605  ·  M 4  ·  M 80  ·  NGC 6093  ·  NGC 6121  ·  NGC 6144  ·  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 ωOph  ·  rho Oph nebula
Rho Ophiuchi, 


            Claus Steindl
Rho Ophiuchi
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Rho Ophiuchi

Technical card

Imaging telescopes or lenses: Canon EF 200mm f/2.8L II USM

Imaging cameras: Canon EOS 6Da

Mounts: HEQ5 PRO

Guiding telescopes or lenses: Skywatcher Finderscope 9x50

Guiding cameras: Lacerta M-Gen II

Software: Adobe Photoshop CC  ·  PixInsight Core 1.8

Dates:June 28, 2016

Frames: 25x300" ISO800

Integration: 2.1 hours

Flats: ~100

Bias: ~80

Avg. Moon age: 22.94 days

Avg. Moon phase: 41.57%

Basic astrometry details

Astrometry.net job: 1159832

RA center: 16h 29' 41"

DEC center: -24° 33' 21"

Pixel scale: 25.212 arcsec/pixel

Orientation: 157.882 degrees

Field radius: 6.311 degrees

Resolution: 1500x1000

Locations: Hochbärneck, St. Anton an der Jeßnitz, Lower Austria, Austria

Data source: Traveller


To prevent star spikes the Canon lens was stopped down with an adapter ring to about f/4.0

Version B: first try with starless layer to bring more details and structure in the nebulas



  • Rho Ophiuchi, 


            Claus Steindl
  • Final
    Rho Ophiuchi, 


            Claus Steindl

Sky plot

Sky plot


Rho Ophiuchi, 


            Claus Steindl