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Contains:  NGC 7789
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NGC 7789, Caroline's Rose, LRGB, 86% waning moon, 


NGC 7789, Caroline's Rose, LRGB, 86% waning moon
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NGC 7789, Caroline's Rose, LRGB, 86% waning moon

Technical card

Dates:Sept. 17, 2019

Teleskop-Service B, 1.25": 15x60" bin 2x2
Teleskop-Service G, 1.25": 10x60" bin 2x2
Teleskop-Service L, 1.25": 35x90" bin 1x1
Teleskop-Service R, 1.25": 17x60" bin 2x2

Integration: 1.6 hours

Darks: ~18

Flats: ~100

Bias: ~100

Avg. Moon age: 17.75 days

Avg. Moon phase: 90.23%

Bortle Dark-Sky Scale: 6.00

Temperature: 8.00

Basic astrometry details job: 2926260

RA center: 23h 57' 26"

DEC center: +56° 42' 21"

Pixel scale: 1.534 arcsec/pixel

Orientation: 60.992 degrees

Field radius: 0.347 degrees

Resolution: 1291x993

Data source: Backyard


A first serious attempt to get to grips with LRGB filters. The conditions were not ideal with NGC7789 on one side of a tree and the moon on the other. At last the LRGB colour balancing using ratios has been tested.

The RGB ratio used was 1.7 : 1 : 1.5. RGB was bin 2x2 with 60s exposures. L was bin 1x1 with 90s exposures. The ratios were derived based on the work done by Brian Morgan at

AstroDMx Capture for Linux (Fedora 30) v0.62.57 was used for data acquisition. This was a good workout for the newly released version.

Calibration, registration, stacking and RGB Composition were carried out with Siril. Final (minimal) processing used Gimp.

It will be interesting to revisit this target when there is no moon.




License: None (All rights reserved)

Sky plot

Sky plot


NGC 7789, Caroline's Rose, LRGB, 86% waning moon,