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Contains:  M 20, NGC 6514, Trifid Nebula
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M20, The Trifid Nebula, 


            Steven Bellavia
M20, The Trifid Nebula
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M20, The Trifid Nebula

Technical card

Imaging telescopes or lenses: Borg 90FL

Imaging cameras: ZWO ASI183MC Pro  ·  ZWO ASI 183MM Pro

Mounts: Sky-Watcher EQ-6R Pro SynScan

Guiding telescopes or lenses: The Bellavia Basic 50mm f/6 guidescope

Guiding cameras: ASI224MC

Software: Pleiades Astrophoto PixInsight  ·  Stark Labs Nebulosity 4.2  ·  Annie's Astro Actions V7  ·  Noel Carboni's Astro Tools for PhotoShop Noel Carboni Actions  ·  Digital Photo Professional  ·  SharpCap Pro 3.2  ·  PHD2 Guiding

Filters: Optolong 7nm Ha 2"  ·  IDAS UIBAR-III

Dates:June 15, 2020June 16, 2020June 17, 2020

Optolong 7nm Ha 2": 21x300" (gain: 100.00) -15C bin 1x1
ZWO Duo-Band Filter: 20x180" (gain: 50.00) -15C
IDAS UIBAR-III: 55x120" (gain: 50.00) -15C bin 1x1

Integration: 4.6 hours

Darks: ~30

Flats: ~30

Flat darks: ~30

Avg. Moon age: 25.04 days

Avg. Moon phase: 21.51%

Bortle Dark-Sky Scale: 2.00

Mean SQM: 21.60

Mean FWHM: 4.67

Temperature: 10.00

Basic astrometry details job: 3617898

RA center: 18h 2' 32"

DEC center: -22° 58' 40"

Pixel scale: 1.358 arcsec/pixel

Orientation: 1.971 degrees

Field radius: 0.674 degrees

Resolution: 2859x2144

Data source: Traveller


M20, The Trifid Nebula, (NGC 6514) is an H II region located in Sagittarius. and is 5,200 light years from Eaeth. It was discovered by Charles Messier on June 5, 1764. Its name means 'divided into three lobes'. The object is an unusual combination of an open cluster of stars; an emission nebula (the lower, red portion), a reflection nebula (the upper, blue portion) and a dark nebula (the apparent 'gaps' within the emission nebula that cause the trifurcated appearance; these are also designated Barnard 85). Viewed through a small telescope, the Trifid Nebula is a bright and peculiar object, and is thus a perennial favorite of amateur astronomers.



Steven Bellavia
License: None (All rights reserved)

Sky plot

Sky plot


M20, The Trifid Nebula, 


            Steven Bellavia