The Heart of the Swan


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By
Catalog
Obj Type
Location
Date Taken:
Mazlin
Messier 17
Nebula
CTIO, Chile
06-23-2015
Description

M17 is a large emission nebula in Sagittarius, similar to that in Orion, but viewed edge-on instead of face-on. Its rather complex and irregular shape has spawned a variety of descriptive monikers, including: Swan Nebula, Omega Nebula, Checkmark Nebula, and Horseshoe Nebula.

The nebulosity extends out considerably more than this image shows, but we wanted to concentrate on the central portion, which is richer in the OIII emission.

Small scale detail is preserved (and enhanced) in this completely narrowband version of M17, whereas it often appears relatively washed out in other M17 versions that use broadband data. Of course, it helps that our image scale at CTIO is 0.4"/pixel, and the FWHM of 30 minute integrations routinely approaches 1.0" (before any deconvolution or other sharpening)!

Technical Details
Exposure Time:
Ha 16 hours, OIII 16 hours, all unbinned
Camera:
Apogee U9
Telescope:
RCOS Carbon Truss 16 inch f/11.3 Ritchey-Chretien
Mount:
Planewave 200HR
© 2018 Mazlin
Used with permission, No reproduction of these images are permitted without written approval from Mazlin.