Dates: July 23, 2017
Integration: 5.3 hours
Avg. Moon age: 0.10 days
Avg. Moon phase: 0.01%
Astrometry.net 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.
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