Hemisphere:  Southern  ·  Constellation: Sagittarius (Sgr)  ·  Contains:  Checkmark Nebula  ·  IC 4701  ·  IC 4706  ·  IC 4707  ·  Lobster Nebula  ·  M 17  ·  M 18  ·  NGC 6596  ·  NGC 6613  ·  NGC 6618  ·  Swan Nebula  ·  omega Nebula
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M17 - Omega Nebula (Hubble Palette), 


            Diego Cartes
M17 - Omega Nebula (Hubble Palette)
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M17 - Omega Nebula (Hubble Palette)

Imaging telescopes or lenses: Televue TV-76

Imaging cameras: ZWO ASI 1600MM Cooled Pro

Mounts: Celestron Advanced VX

Guiding telescopes or lenses: Celestron 50mm Guide Scope  ·  ZWO 60mm Guidescope

Guiding cameras: ZWO ASI 290mm Mini

Focal reducers: Televue 0.8x focal reducer / field flattener

Software: PixInsight 1.8 Pisinsight 1.8  ·  Sequence Generator Pro

Filters: ZWO OIII -7nm 36mm  ·  ZWO SII -7nm 36mm  ·  ZWO H-alpha 36mm

Accessory: ZWO 7x 36mm Filter Wheel (EFW)  ·  Intel NUC  ·  Arduino ASCOM Focuser Pro2  ·  QHYCCD Polemaster

Dates:July 13, 2020July 14, 2020July 15, 2020July 16, 2020Aug. 3, 2020Aug. 4, 2020Aug. 5, 2020Aug. 10, 2020Aug. 11, 2020Aug. 12, 2020

ZWO OIII -7nm 36mm: 37x600" bin 1x1
ZWO SII -7nm 36mm: 34x600" bin 1x1
ZWO H-alpha 36mm: 41x600" bin 1x1

Integration: 18.7 hours

Darks: ~50

Flats: ~22

Bias: ~50

Avg. Moon age: 20.85 days

Avg. Moon phase: 57.77%

Astrometry.net job: 3756003

RA center: 18h 21' 10"

DEC center: -16° 6' 54"

Pixel scale: 2.058 arcsec/pixel

Orientation: 220.699 degrees

Field radius: 1.614 degrees

Resolution: 4520x3384

Locations: Backyard, Colina, Region Metropolitana, Chile

Data source: Backyard


The Omega Nebula, also known as the Swan Nebula, Checkmark Nebula, and the Horseshoe Nebula (catalogued as Messier 17 or M17 or NGC 6618) is an H II region in the constellation Sagittarius. It was discovered by Philippe Loys de Chéseaux in 1745. Charles Messier catalogued it in 1764. It is located in the rich starfields of the Sagittarius area of the Milky Way. (Wikipedia).

Almost a month has passed since the last time i captured data from this nebula, because the moon and the clouds were in the way. I finally had two clear nights, and used them to capture the SII data needed to made this particular image.

The processing was made using Pixinsight's Colormask script, following this tutorial by Chuck Ayoub, avaliable here: https://www.youtube.com/watch?v=imlwGzV7RiE