Hemisphere:  Southern  ·  Constellation: Sagittarius (Sgr)  ·  Contains:  9 Sgr  ·  B296  ·  B88  ·  B89  ·  Lagoon Nebula  ·  M 8  ·  NGC 6523  ·  NGC 6526  ·  NGC 6530  ·  The star 9Sgr
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Lagoon Nebula, 


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Lagoon Nebula

Getting plate-solving status, please wait...
Lagoon Nebula, 


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Lagoon Nebula

Imaging telescopes or lenses: Planewave CDK24

Imaging cameras: FLI Proline 16803

Mounts: Planewave L600

Guiding cameras: Starlight Xpress Ultrastar

Software: Planewave PWI3  ·  Planewave PWI4  ·  PixInsight 1.8  ·  Sequence Generator Pro  ·  Photoshop CS3  ·  Maxim DL6  ·  Adobe Photoshop CC 2014

Filters: Astrodon 50 mm 5 nm Ha  ·  Astrodon 50mm B  ·  Astrodon 50mm R  ·  Astrodon 50mm L  ·  Astrodon 50 mm 5 nm OIII  ·  Astrodon 50 mm G

Accessory: FLI CFW-5-7  ·  Hedrick Focuser  ·  Planewave Delta-T  ·  Planewave EFA

Dates:July 8, 2021July 9, 2021July 10, 2021

Astrodon 50 mm 5 nm Ha: 16x300" (1h 20') -20C bin 1x1
Astrodon 50 mm 5 nm OIII: 17x300" (1h 25') -20C bin 1x1
Astrodon 50 mm G: 12x300" (1h) -20C bin 1x1
Astrodon 50mm B: 12x300" (1h) -20C bin 1x1
Astrodon 50mm L: 6x300" (30') -20C bin 1x1
Astrodon 50mm R: 12x300" (1h) -20C bin 1x1

Integration: 6h 15'

Darks: 20

Flats: 120

Flat darks: 120

Bias: 20

Avg. Moon age: 19.18 days

Avg. Moon phase: 0.93%

Mean SQM: 21.30

Mean FWHM: 2.50

Astrometry.net job: 4750672

RA center: 18h 4' 7"

DEC center: -24° 20' 24"

Pixel scale: 0.468 arcsec/pixel

Orientation: 0.804 degrees

Field radius: 0.375 degrees

Resolution: 4078x4081

Locations: KG Observatory, Julian, CA, United States

Data source: Backyard


My 2nd of 3 objects acquired during the July 2021 dark cycle.

This was not my first choice as it's only between 27° and 32° between 10:30 PM and 1:30 PM. But my wife loves seeing it through her giant binoculars. Curiously she wanted to see what it looks like in the 24". (-:

Given the relatively low altitude, most of the subs were greater than 3" FWHM. So I only kept the subs < 3" which resulted in much less data. But this bright object seemed to reproduce relatively well with what I kept.

This is LRGB with a starless OIII and Ha 50% screened overlay. Deconvolution was applied to L, Ha and OIII. Some minor selective color manipulation was needed to help restore the results to what I saw in the RGB reference. Otherwise, processing is very minimal with a very mild USM and selective star shrink to help preserve the main structure.

"The Lagoon Nebula is estimated to be between 4,000-6,000 light-years away from Earth. In the sky it spans 90' by 40', which translates to an actual dimension of 110 by 50 light years. The nebula contains a number of Bok globules (dark, collapsing clouds of protostellar material). It also includes a funnel-like or tornado-like structure caused by a hot O-type star that emanates ultraviolet light, heating and ionizing gases on the surface of the nebula. The Lagoon Nebula also contains at its center a structure known as the Hourglass Nebula (so named by John Herschel). In 2006 the first four Herbig–Haro objects were detected within the Hourglass, also including HH 870. This provides the first direct evidence of active star formation by accretion within it."


Sky plot

Sky plot


Lagoon Nebula,