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Contains:  IC 4603
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IC4603 Rho Ophiuchi Complex, 


            Jerry Macon
IC4603 Rho Ophiuchi Complex

IC4603 Rho Ophiuchi Complex

Technical card

Resolution: 4464x3484

Dates:May 17, 2018

Frames:Astrodon Gen 2 RGB 36mm: 80x300" (gain: 201.00) -20C bin 1x1

Integration: 6.7 hours

Avg. Moon age: 2.25 days

Avg. Moon phase: 5.61%

Bortle Dark-Sky Scale: 4.00 job: 2068169

RA center: 246.432 degrees

DEC center: -24.520 degrees

Pixel scale: 1.180 arcsec/pixel

Orientation: 92.421 degrees

Field radius: 0.928 degrees

Locations: Dark Star Observatory, Taos, New Mexico, United States

Data source: Unknown


This is my first image with a new set of filters from Astrodon. It only uses the RGB, so I am anxious to try out the new 5nm Ha, Sii Oiii set. It is also only my second image with the MEII with absolute encoders. Such a joy to not need to do any guiding, which over the years has been a great source of frustration and lost imaging for me.

IC 4603 is a reflection nebula visible in the constellation of the Ophiuchu.
It is located in the southern part of the constellation, north of the red star Antares and is a small part of the Cloud of Rho Ophiuchi illuminated directly by the radiation of HD 147889, a blue giant of spectral class B2III located anteriorly to the densest part of the cloud, but completely surrounded by its gases. This star has a very reddish spectrum, which reveals that its light is filtered and partly masked by the cloud in which it is immersed; his young age indicates that it originated from a process of stellar formation within the same Cloud of Rho Ophiuchi. The measurements of the parallax, which provides a distance of 443 light years from the solar system, that is identical to that of the cloud, provides further proof of the link between these two objects.



Jerry Macon
License: Attribution Creative Commons

Sky plot

Sky plot


IC4603 Rho Ophiuchi Complex, 


            Jerry Macon