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Uploaded 29-Aug-10
Taken 31-Jul-10
Visitors 45


17 of 74 photos
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Categories & Keywords

Category:Scenic
Subcategory:Night Sky
Subcategory Detail:
Keywords:Horseshoe Nebula, M17, NGC6618, Omega Nebula, Swan Nebula
Photo Info

Dimensions3720 x 2640
Original file size5.83 MB
Image typeJPEG
Color spaceUncalibrated
Date taken31-Jul-10 17:19
Date modified29-Aug-10 17:20
Shooting Conditions

Camera makeCanon
Camera model40D
ISO speedISO 1600
Messier 17 The Swan Nebula 2010

Messier 17 The Swan Nebula 2010

About this Object:
The Swan Nebula, also known as the Omega Nebula and the Horseshoe Nebula[2] (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. The Omega Nebula is between 5,000 and 6,000 light-years from Earth and it spans some 15 light-years in diameter. The cloud of interstellar matter of which this nebula is a part is roughly 40 light-years in diameter. The total mass of the Omega Nebula is an estimated 800 solar masses. A open cluster of 35 stars lies embedded in the nebulosity and causes the gases of the nebula to shine due to radiation from these hot, young stars.

About this Photo:

Location: From my driveway in Georgetown, Texas
Telescope: Celestron C9.25 @ F10
Mount: HEQ-5
Guiding: Orion StarShoot AutoGuider / Tauruss Tracker III
Camera: Canon 40D Modified
Exposure: 57 x 180 sec @ ISO 1600 (2 hrs 51 min.)
Acquisition: ImagesPlus 3.75 Camera Control
Processing: ImagesPlus 3.75 – Darks,Flats,Bias
Post-processing: Adobe Photoshop CS3; Gradient Exterminator; Noise Ninja; Noel Carboni's Tools;
Date(s): July 31, 2010
Temperature(s): 90-80º F