Hemisphere:  Southern  ·  Constellation: Ophiuchus (Oph)  ·  Contains:  5 rho Oph  ·  B42  ·  IC 4603  ·  IC 4604  ·  The star ρOph  ·  rho Oph nebula
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IC 4604, Rho Ophiuchi Molecular Cloud Complex, 11 Jun 2013, 


            David Dearden
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IC 4604, Rho Ophiuchi Molecular Cloud Complex, 11 Jun 2013

Imaging Telescopes Or Lenses
Orion ShortTube 80 f/5
Imaging Cameras
Meade DSI II C
Baader Planetarium Fringe Killer
HB Home-built TEC1-12706 cooler · Antares 0.5x Reducer
PHD guiding · photoshop · Silicon Fields StarTools 1.3 · Noel Carboni's Astro Tools for PhotoShop · AstroPlanner · Stellarium · Nebulosity · Stark Labs Shoestring Focus
Guiding Telescopes Or Lenses
Orion 9x50 finder
Guiding Cameras
Meade DSI

Acquisition details

June 11, 2013
36x300" (3h)
Avg. Moon age:
2.55 days
Avg. Moon phase:

RA center: 16h25m57s.49

DEC center: -23°5429.4

Pixel scale: 8.730 arcsec/pixel

Orientation: -123.631 degrees

Field radius: 0.963 degrees

More info:Open 

Resolution: 620x497

Locations: Mapleton Lateral Observatory, Mapleton, Utah, United States


Rho Oph is easy to find by lining up the Telrad using Antares and Alniyat. The nebulosity is dim, so I'm not sure I'll get anything, but it is nice to bag a new object. Using the chiller at 2.5 A, 17 °C. A bit of gusty breeze tonight. It is difficult working with targets this far south, because I don’t get much time above the horizon. I also had a bit of trouble finding a guide star, surprisingly enough; I had to go to 2 s guiding exposures instead of my usual 1.5. Is this dark nebula blocking the stars?

Date: 11 Jun 2013

Subject: IC 4604, Rho Ophiuchi Molecular Cloud Complex

Scope: Orion ST80+Antares 0.5x telereducer

Filter: Baader Fringe Killer

Mount: CG-5 (Synta motors)

Guiding: 9x50 Finder/Guider + DSI Ic + PHD 1.14.2

Camera: DSI IIc (cooled at 2.5 A, 8 V, 17 °C)

Acquisition: Nebulosity 3.1.6

Exposure: 36 x 300 s

Stacking: Neb 3, bad pixel map, bias included, normalize first, trans+rot align, 1.5 SD stack.

Processing: StarTools 1.3 Crop; Band; Wipe:Color & Brightness; Develop 93.74%; Contrast; HDR:Equalize; Sharpen; Deconvolute:2 pix; Track; Color:Bottom 2.0, Top Full, Sat 270%; Life:Heavy. CS6+Astronomy Tools: increase star color; deep space noise reduction; less crunchy more fuzzy twice; AstroFrame.


Sky plot

Sky plot


IC 4604, Rho Ophiuchi Molecular Cloud Complex, 11 Jun 2013, 


            David Dearden