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Westerhout 40 or W40 (also designated Sharpless 64, Sh2-64, or RCW 174) is a star-forming region in our galaxy located in the constellation Serpens Cauda. In this region, interstellar gas forming a diffuse nebula surrounds a cluster of several hundred new-born stars.The distance to W40 is 4369 pc (142030 light-years),making it one of the closest sites of formation of high-mass O- and B-type stars.The Ionizing radiation from the massive OB stars has created an H II region,which has an hour-glass morphology. Dust from the molecular cloud in which W40 formed obscures the nebula, rendering W40 difficult to observe at visible wavelengths of light. Thus, X-ray, infrared, and radio observations have been used to see through the molecular cloud to study the star-formation processes going on within. W40 appears near to several other star-forming regions in the sky, including an infrared dark cloud designated Serpens South and a young stellar cluster designated the Serpens Main Cluster.Similar distances measured for these three star-forming regions suggests that they are near to each other and part of the same larger-scale collection of clouds known as the Serpens Molecular Cloud [Text from Wikipedia]

Pubblications "Flickr" Explore - July 28, 2020
Optics: Takahashi FSQ-106EDXIII F/5 530mm. - APO Refractor
Mount: AP Mach1 GTO
Camera: Moravian G4-16000 Mark II
Filters: Astrodon E Series Gen II LRGBHA 50mm squared
Guiding Systems: SX Lodestar
Dates/Times: July 2020
Location: Pragelato - Turin - Italy
Exposure Details: L:R:G:B => 540:90:90:90 = > (54x10):(18x5):(18x5):(18x5) [num x minutes] color bin 2
Cooling Details: -25 C
Acquisition: Voyager Astrophotography Automation
Processing: CCDStack2+, PixInsight, PS CC
Mean FWHM: 1.21 / 2.05
SQM-L: 20.34 / 21.01