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

Celestial hemisphere: Southern · Constellation: Ophiuchus (Oph) · Contains: 5 Oph · IC 4603 · IC 4604 · The star ρ Oph · rho Oph Nebula

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

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.

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