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Contains:  IC 4603
Getting plate-solving status, please wait...
vdB 105, 


            Gary Imm
vdB 105

vdB 105

Technical card

Resolution: 4314x3075

Dates:May 10, 2018May 11, 2018June 7, 2019June 8, 2019

Astrodon Blue 31mm Gen2 I-Series: 150x60" (gain: 139.00) -20C bin 1x1
Astrodon Green 31mm Gen2 I-Series: 150x60" (gain: 139.00) -20C bin 1x1
Astrodon Lum 31mm Gen2 I-Series: 340x60" (gain: 139.00) -20C bin 1x1
Astrodon Red 31mm Gen2 I-Series: 150x60" (gain: 139.00) -20C bin 1x1

Integration: 13.2 hours

Avg. Moon age: 14.90 days

Avg. Moon phase: 24.19% job: 2739560

RA center: 246.352 degrees

DEC center: -24.468 degrees

Pixel scale: 0.782 arcsec/pixel

Orientation: 267.894 degrees

Field radius: 0.575 degrees

Locations: Backyard (Mag 20.8 - New Moon), Onalaska, Texas, United States

Data source: Backyard


This object, also known as IC 4603, is a reflection nebula located about 400 light years away in the constellation of Ophiuchius. This field of view is just a small part of the beautiful Rho Ophiuchus Nebula Complex.

The image is primarily blue because of the starlight illuminated interstellar dust throughout the field of view. The same dust creates an orange cast to the background stars. The dust is so thick in spots that it completely hides some of the stars. The small, bright flare-type area at the top right of the image is interesting, as is the "E-E-E" shaped dark dust cloud just below it.

This was a tough object to image and process. In my subs, all I saw were the 2 central stars plus a few hints of dark clouds. I stretched the final image quite a bit to help bring out the beautiful subtle dark dust clouds flowing throughout the image. This stretching also brought out more of the noise in the image.

I am very happy and excited to be imaging again after over a month of downtime, due to a mount repair and a wonderful family trip to Slovenia and Croatia.



Gary Imm
License: None (All rights reserved)


  • vdB 105, 


            Gary Imm
  • Final
    vdB 105, 


            Gary Imm


I wasn't happy with the color noise in the original (visible at full resolution), so I make some adjustments.

Sky plot

Sky plot


vdB 105, 


            Gary Imm