Daily Archives: February 1, 2015

The Omega Nebula, or Swan Nebula


The Omega Nebula, also known as the Swan Nebula, Checkmark Nebula, Lobster Nebula, and the Horseshoe Nebula (catalogued as Messier 17 or M17 and as NGC 6618) is an H II region in the constellation Sagittarius. It was discovered by Philippe Loys de Chéseaux in 1745. Charles Messier catalogued it in 1764. It is located in the rich starfields of the Sagittarius area of the Milky Way.

Imaging telescopes or lenses: GSO RC8
Imaging cameras: Magzero MZ9M
Mounts: Mountain Instruments MI-250
Guiding telescopes or lenses: GSO RC8
Software: PixInsight
Filters: SII,  Baader Planetarium OIII,  Baader Planetarium H-Alpha Filter
Accessories: QHYCCD Filter Wheel QHY 2″
Resolution: 1600×1333
Dates: June 27, 2011,  June 28, 2011,  June 29, 2011
Baader Planetarium H-Alpha Filter: 24×300″ -30C bin 1×1
Baader Planetarium OIII: 22×360″ -30C bin 1×1
SII: 22×300″ -30C bin 1×1
Integration: 6.0 hours
Avg. Moon age: 26.23 days
Avg. Moon phase: 12.31%
RA center: 275.260 degrees
DEC center: -16.171 degrees
Pixel scale: 1.206 arcsec/pixel
Orientation: 88.760 degrees
Field radius: 0.349 degrees
Author: OsservatorioMonteSanGiovanni