Hemisphere:  Southern  ·  Constellation: Sagittarius (Sgr)  ·  Contains:  Hourglass nebula  ·  Lagoon nebula  ·  M 20  ·  M 8  ·  NGC 6514  ·  NGC 6523  ·  NGC 6526  ·  NGC 6530  ·  NGC 6544  ·  NGC 6546  ·  The star 4Sgr  ·  The star 7Sgr  ·  The star 9Sgr  ·  Trifid nebula
M8 (Lagoon) and M20 (Trifid) Nebulae in wide field, 


            Barry Brook
M8 (Lagoon) and M20 (Trifid) Nebulae in wide field
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M8 (Lagoon) and M20 (Trifid) Nebulae in wide field

Technical card

Imaging telescopes or lenses: Orion ED80T CF

Imaging cameras: Sony NEX-3 DSLR

Mounts: Skywatcher AZ EQ-6 GT

Guiding telescopes or lenses: Skywatcher SW120 F5 refractor

Guiding cameras: ZWO optical ASI120MM-S

Focal reducers: TeleVue 0.8x Photo Reducer/Flattener TRF-2008

Software: Cartes du Ciel  ·  Nebulosity 3  ·  EQASCOM  ·  StarTools  ·  Metaguide v5.1.7  ·  AstroTortilla 0.7

Dates:Aug. 2, 2014

50x30" (25') ISO800
25x300" (2h 5') ISO800

Integration: 2h 30'

Darks: ~25

Flats: ~100

Bias: ~100

Avg. Moon age: 5.93 days

Avg. Moon phase: 34.76%

Bortle Dark-Sky Scale: 6.00

Mean FWHM: 1.85

Temperature: 3.00

Basic astrometry details

Astrometry.net job: 343909

RA center: 18h 3' 41"

DEC center: -24° 15' 43"

Pixel scale: 5.505 arcsec/pixel

Orientation: -89.089 degrees

Field radius: 2.079 degrees

Resolution: 620x410


A famous region towards the heart of the galaxy, captured in wide field (about 3.5 x 2.3 degrees). The Lagoon Nebula (M8 or NGC 6523) is a vast cloud of interstellar gas in the constellation Sagittarius (55 x 20 light years across). To the lower right is the Trifid Nebula (M20 or NGC 6541), another colourful HII region. They are located 4,100 to 5,200 light years from Earth.

This astro-image was captured in urban (Bortle 6 skies), and created as a layered blend of 25 x 5 min and 55 x 30 sec subs, for a total integration of 2.5 hours.

Captured and pre-processed with flats (light box), bad pixel map and bias in Nebulosity. Post-processed in StarTools.


Sky plot

Sky plot


M8 (Lagoon) and M20 (Trifid) Nebulae in wide field, 


            Barry Brook