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Matthew Dieterich

Location of Photo:

Spruce Knob, WV

Date/Time of photo:



Object: LDN 673 in the constellation Aquilla Optics: ASA 8" H F/2.8 Astrograph Mount: Orion Atlas EQ-G Guiding: 50 mm Finder, Orion SSAG and PhD Camera: Astrodon Filter Modified Canon Xsi (450D) F/stop: F/2.8 Exposure:15 x 3 minutes: 45 minutes total integration ISO: 1600 Mode: RAW White Balance: Custom Filter: None Conditions: Temp. 55 degrees F Dates: September 8th, 2013 Location: Spruce Knob, WV Calibration: ImagesPlus 4.50 Calibration Frames: Darks, flats, flat darks and bias Processing: PixInsight and Photoshop


LDN 673 (Lynds’ Dark Nebula 673) is a highly fractured and very dense dark cloud complex of about 7 light-years across, located in the center of the Aquila Rift, some 300 – 600 light-years from Earth in the northern constellation of Aquila (the Eagle). The Aquila Rift forms a great mass of dark molecular clouds along the summer Milky Way through the constellations Aquila, Serpens, and eastern Ophiuchus. It consists of numerous small and large clouds, many of which have been identified and tabulated by B.T. Lynds (in 1962). Together with the Vulpecula Rift and the Cygnus Rift or Northern Coalsack, it is part of the so-called Great Rift (also Dark Rift, or Dark River), which is a series of overlapping, non-luminous, molecular dust clouds that are located between the Solar System and the Sagittarius Arm of the Milky Way Galaxy. (Info citation: http://annesastronomynews.com/annes-image-of-the-day-dark-nebula-ldn-673/)




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