Hemisphere:  Southern  ·  Contains:  19 omi Sco  ·  20 sig Sco  ·  21 alf Sco  ·  22 i Sco  ·  5 rho Oph  ·  Alniyat  ·  Antares  ·  B229  ·  B42  ·  IC 4603  ·  IC 4604  ·  IC 4605  ·  IC4603  ·  IC4604  ·  M 4  ·  M4  ·  NGC 6121  ·  NGC 6144  ·  NGC6144  ·  Scorpius  ·  Sh2-9  ·  The star 22Sco  ·  The star Al Niyat (σSco)  ·  The star Antares (αSco)  ·  The star οSco  ·  The star ρOph  ·  rho Oph nebula
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The Rho Ophiuchi Cloud Complex - 9 Panel Mosaic, 


            Matt Harbison
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The Rho Ophiuchi Cloud Complex - 9 Panel Mosaic

Imaging telescopes or lenses: William Optics FLT 132 Triplet APO WOFLT132  ·  William Optics FLT 132 Triplet APO Scope #2

Imaging cameras: QHY 16200A 16200 #2  ·  QHY 16200A

Mounts: Astro-Physics 1100 GTO

Guiding telescopes or lenses: Willam Optics 50mm Guidescope

Guiding cameras: QHY-5-L-II-M QHY5-II Mono

Focal reducers: William Optics Reducer 0.80 #2  ·  William Optics Reducer WO 0.80 #1  ·  WILLIAM OPTICS FLAT 4

Software: PixInsight  ·  Adobe Photoshop photoshop PS  ·  Sequence Generator Pro

Filters: B  ·  G  ·  R  ·  L

Accessory: QHY Med OAG QHYOAG-M  ·  Moonlite Crayford Focuser with motor

Dates:June 10, 2018June 11, 2018June 12, 2018June 13, 2018

Astrodon Tru-Balance LRGB E-Series Gen 2: 36x180" -15C bin 1x1
Astrodon Tru-Balance LRGB E-Series Gen 2: 12x180" -180C bin 1x1

Integration: 2.4 hours

Darks: ~15

Flats: ~15

Bias: ~15

Avg. Moon age: 27.47 days

Avg. Moon phase: 6.29%

Bortle Dark-Sky Scale: 1.00

Astrometry.net job: 2117952

RA center: 16h 27' 28"

DEC center: -25° 3' 33"

Pixel scale: 10.522 arcsec/pixel

Orientation: -78.600 degrees

Field radius: 3.407 degrees

Resolution: 1824x1453

Locations: Marathon Motel, Marathon Motel, TX, United States

Data source: Traveller


The Rho Ohphiuchi Cloud Complex- A 9 Panel mosaic shot in Marathon Texas at the Marathon Motel & RV Park during the new moon in June over the course of 4 nights. Some of the most beautiful colors in our galaxy are found in Scorpius around the Rho Ophiuchi Cloud Complex and I was happy to finally catch their photons on my telescope!

Technical Details:
12 x 180s L
12 x 180s R
12 x 180s G
12 x 180s B

Flats taken after each session. Bias and Darks from my library.

Equipment Dtails:
2 x William Optics 132 FLT 5.5 Telescope w/ Flat 7 @ 5.6
Lum & Red shot on scope 1, Green and Blue shot on scope2
Astro Physics 1100 GTO
QHY 16200 x 2
QHY 5LII Guide Camera on WO 50mm Scope

Calibrated, Combined, and Exported in Pixinsight. Levels and Color adjustment in Photoshop. Plate Solve from Pixinsight.

Panel Process:
-Dynamic crop per panel
-Batch PreProcessing used to combine flats, darks, and bias frames. Cosmetic Correction used on each panel.
-Dynamic Background adjustment per panel
-Photometric Color Calibration per panel
-Histogram Transformation applied
-Noise Reduction via SCNR Green Channel
-Export to master TIF for full color panel

Mosaic Process:
-Each Channel solved via Image Solver in Pixinsight- Tedious but effective and ensures a valid plate solve.
-Saved as .Tiff & .Xisf per channel
-Mosaic By Coordinates Script ran on each channel master to create a master per channel.
-EXTREMELY GOOD NOTES taken per panel for image center and Photometric Color Calibration (If you don't, you'll redo the process over and over- Sky Safari is your friend.
-Combination via Gradient Merge Mosaic per channel
-Optional combination of LRGB targets yield less color & slightly better combination to my eye. YMMV.



Matt Harbison


    The Rho Ophiuchi Cloud Complex - 9 Panel Mosaic, 


            Matt Harbison
  • Final
    The Rho Ophiuchi Cloud Complex - 9 Panel Mosaic, 


            Matt Harbison


Description: Color Version

Sky plot

Sky plot


The Rho Ophiuchi Cloud Complex - 9 Panel Mosaic, 


            Matt Harbison