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Contains:  NGC 1999
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NGC 1999 DSW in LRGB

Technical card

Imaging telescope or lens:RC Optical 14.5”

Imaging camera:SBIG STX-16803

Mount:Paramount ME

Guiding telescope or lens:RC Optical 14.5”

Guiding camera:SBIG STX-16803


Filters:Astrodon BAstrodon GAstrodon RAstrodon L

Resolution: 3991x3901

Dates:Nov. 18, 2017Nov. 19, 2017Nov. 21, 2017Dec. 16, 2017

Astrodon B: 16x1200" bin 1x1
Astrodon G: 17x1200" bin 1x1
Astrodon L: 17x1200" bin 1x1
Astrodon R: 20x1200" bin 1x1

Integration: 23.3 hours

Avg. Moon age: 7.89 days

Avg. Moon phase: 2.96% job: 2043417

RA center: 84.050 degrees

DEC center: -6.653 degrees

Pixel scale: 0.551 arcsec/pixel

Orientation: 16.138 degrees

Field radius: 0.427 degrees

Locations: Deep Sky West, Rowe, NM, United States


This is NGC 1999 from DSW RCOS data taken in November through December 2017 in Orion. It is located 1,500ly distant. It is a bright reflection nebula due to V380 Orionis, a variable star. The dark triangular region in the middle is particularly dark nebula in the middle of the otherwise bright nebula. Interestingly, it has been determined that this is actually a particularly empty space as opposed to a particularly dense dusty region.

The image is composed of LRGB. This was an interesting choice on the part of DSW as opposed to NB imaging. As a result, my color calibration turned out to be largely a deep bloody red color with some bits of blue above the brightest core region of the nebula. I did use PhotometricColorCalibration in PI, so the coloring is supposedly based on scientific-based calibration. The stars are quite saturated and only show some measure of coloring in their halos. Should I attempt to process this again I will make more effort on dimming the stars so that they are not so dominant in the image. Still I am impressed by the level of detail that came out of the nebula. I applied HDRMT in order to bring out more of the brightest region surrounding the dark region.



Ben Koltenbah
License: None (All rights reserved)



Synthetic L Channel Image


Inverted Synthetic L Image


Annotated L Image

Sky plot

Sky plot


NGC 1999 DSW in LRGB, 


            Ben Koltenbah