IC 4685

IC 4685

Emission/Reflection Region in Sagittarius

Constellation: Sagittarius
Ra: 18hr 09m 32s
Dec: -23d 50m 56s
Distance: 4,000 ly
Image Size: 34.5 x 34.5'
North: Up, right

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Description

About 1.25 deg. northeast of M8 (Lagoon Nebula) in the constellation of Sagittarius about 4,000 light years distant, lies a complex emission/reflection region dominated by IC 4685; the bright region in the lower portion of my image above.  North is up/right and East is left/up. The image size is 34.5 x 34.5 arcmin.  The bright, bulbous emission regions toward the top of the image are IC 1275 and IC 1275, and between those is the dark cloud (B91).  H-a and OIII narrowband data were taken to bring out detail in the emission nebulae, and deep broadband blue data were added to better capture the blue reflection components. Shorter RGB exposures were also added for star colors.  The RA/DEC coordinates provided are for the center of the image, and not for IC 4685.  An annotated image is presented below.
Exposure: 15hrs Total; 5.5hrs each H-a, OIII, 2.5hrs blue, 1.5hr RGB
Telescope: PlaneWave CDK20 0.5m f/6.8
Mount: PlaneWave Ascension 200h
Oag: Astrodon MonsterMOAG
Acquisition: ACP8-Expert
Calibration: CCDStack v2
Observatory Site: iTelescope.net, Siding Spring, NSW, Australia
Camera: SBIG STX 16803
Filters: Astrodon 5 nm H-a, 3 nm OIII, Gen 2 E-Series RGB
Guider: SX Lodestar
Camera Operation: MaximDL4.23
Processing: Photoshop CC2015.5
Image Date: 05/18/2016 - 06/15/2016

2 Comments

  1. Josep

    Wonderful image. It’s amazing that such a nice nebula is infrequently imaged. This can only be explained by its popular neighbors M8 and M20… Great job with the colors.

    Reply
  2. Sakib

    Wow candy floss on a cosmic scale, this has always been one of my favourite regions that combine all the main nebula types ever since I saw the widefield image by David Malin many years ago. If the field of view was wider, the planetary nebula M1-41 to the south would have also been included.

    Reply

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