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Little Rosette Nebula (Sharpless 170), 


            Ross Walker
Little Rosette Nebula (Sharpless 170)
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Little Rosette Nebula (Sharpless 170)

Technical card

Dates:Oct. 6, 2019

Chroma Ha (3nm): 79x360" (gain: 139.00) -10C bin 1x1
Chroma OIII (3nm): 118x360" (gain: 139.00) -10C bin 1x1
Chroma SII (3nm): 113x360" (gain: 139.00) -10C bin 1x1

Integration: 31.0 hours

Avg. Moon age: 8.12 days

Avg. Moon phase: 57.84%

Bortle Dark-Sky Scale: 5.00

Mean SQM: 20.00

Basic astrometry details job: 3303167

RA center: 0h 1' 46"

DEC center: +64° 37' 15"

Pixel scale: 1.059 arcsec/pixel

Orientation: 269.623 degrees

Field radius: 0.760 degrees

Resolution: 4086x3156

Locations: Home observatory, Otsu, Shiga, Japan

Data source: Backyard


This is the Little Rosette Nebula, an emission nebula located about 7500 light-years from earth in the constellation of Cassiopeia. Named after the more well-known Rosette Nebula in Monoceros due to their morphological similarities, and presented here in the HOS palette. Little Rosette is around 22 arc-minutes in diameter, and its hydrogen and sulphur emissions are reasonably strong but Oxygen is surprisingly weak. It's located in a sea of stars that tend to overwhelm the scene (star reduction is yet another processing technique I need to learn). It has some cool bok globules around the periphery that I will try to enhance on the next iteration. Number 170 in the Sharpless catalogue of H2 (emission) regions.

For an example of this scene with processing that does it justice, take a look at Marcel Drechsler's outstanding example here

Other IDs:
SH 2-170;LBN 117.62+02.29;LBN 577;



Ross Walker
License: None (All rights reserved)

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Little Rosette Nebula (Sharpless 170), 


            Ross Walker