Contains: NGC 6259, NGC 6250, NGC 6249, NGC 6216, NGC 6178
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Sandqvist 187-192 dark nebulae

Technical card

Imaging telescope or lens: FSQ-106ED

Imaging camera: QHY CCD QHY16200A

Guiding camera: QHY5L-II mono

Software: Adobe Photoshop CC 2017PixInsightAstronomy Tools Actions Set

Filter: Baader LRGB 2" Filters

Accessory: Stardome

Resolution: 8635x3407

Dates: July 23, 2017

Frames: 64x300"

Integration: 5.3 hours

Avg. Moon age: 0.10 days

Avg. Moon phase: 0.01% job: 1682585

RA center: 251.748 degrees

DEC center: -45.451 degrees

Pixel scale: 2.325 arcsec/pixel

Orientation: 179.449 degrees

Field radius: 2.998 degrees

Locations: Bellatrix Observatory, Oliveira, Brazil


This two-panel mosaic in the Scorpius/Ara/Norma border contains the dark nebulae complex Sandqvist 187-192, the compact dark nebula Barnard 235 (center-top), and the red emission nebulae RCW 110/111. Just below the center of the field is the mind-boggling open cluster Westerlund 1, displaying strongly reddened stars. It is a compact young super star cluster in the Milky Way galaxy, about 15000 light years away from Earth. Westerlund 1 is one of the most massive young star clusters in the Milky Way, and was discovered by Bengt Westerlund in 1961, but remained largely unstudied for many years due to high interstellar absorption in its direction. In the future, it will probably evolve into a globular cluster (Wiki). The filamentary dark nebula Sandqvist 187 (at right) is a dense molecular cloud in the Milky Way, 2000 light years away (Alvarez et al., Astrophysical Journal,1, 300,1986, p. 756-765).

Thanks to J. Barros.



Luiz Duczmal

Sky plot

Sky plot


Sandqvist 187-192 dark nebulae , 


        Luiz Duczmal

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