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Technical card

Resolution: 3833x2898

Dates:July 14, 2019Aug. 7, 2019Aug. 9, 2019Aug. 10, 2019Aug. 11, 2019

Astrodon Ha 3nm-31mm: 195x180" (gain: 139.00) -15C bin 1x1
Astrodon OIII 3nm-31mm: 114x180" (gain: 139.00) -15C bin 1x1
Astrodon SII 3nm-31mm: 79x180" (gain: 139.00) -15C bin 1x1

Integration: 19.4 hours

Darks: ~30

Bias: ~50

Avg. Moon age: 10.00 days

Avg. Moon phase: 74.62%

Bortle Dark-Sky Scale: 5.00 job: 2860066

RA center: 306.714 degrees

DEC center: 40.192 degrees

Pixel scale: 1.413 arcsec/pixel

Orientation: 119.406 degrees

Field radius: 0.943 degrees

Locations: Monterey Pines Observatory, Monterey, California, United States

Data source: Backyard


In the heart of Cygnus, near the bright star, Sadr, is the Butterfly Nebula (IC 1318). It flies an arc across the sky on summer evenings in Northern California. While its wings appear to be two separate nebulae, it is actually a single nebula bisected by a 20 light-year long dark lane of dust (LDN 889) that forms the body of the butterfly.

This image is composed of a strong Ha emission signal, and weaker SII and OIII signals. Relentless night time overcast here in Monterey meant that I was able collect only a few hours of data at a time during occasional and brief weather break over the last two months. This week I finally got the last couple of hours of the 20 hours total needed for this image. For me, it was worth the trouble.



Gary Lopez
License: None (All rights reserved)

Sky plot

Sky plot


Summer Butterfly, 


            Gary Lopez