by neufer » Wed Jul 25, 2012 6:07 pm
Chris Peterson wrote:RedFishBlueFish wrote:
I do wonder what the (non-auroral) skyglow is from on the horizon. The picture is taken facing north towards Polaris - so rising or setting Sun seems unlikely. K-Falls is in the wrong relative direction, as is Eugene. Bend, though sort of in the right geographical orientation, seems both too far away and too small to account for such brightness?
Bend is
exactly in the right direction for the center of the light dome (just below Capella, at an azimuth of about 30° when the picture was taken), and puts out plenty of light to produce a dome like this in a long exposure image (it's only 90 miles away). Some of the glow probably comes from little towns like Chemult and even intersection lights along Hwy 97. Just one unshielded porch light a few miles distant can produce a noticeable glow on a 30-second starfield image.
http://en.wikipedia.org/wiki/Bend,_Oregon wrote:
<<Bend is Central Oregon's largest city with Bend's metro population was estimated at 170,705 as of July 1, 2009. The name Bend was derived from "Farewell Bend", the designation used by early pioneers to refer to the location along the Deschutes River where the town was eventually platted, one of the few fordable points along the river. For at least 12,000 years, until the winter of 1824, the Bend area was known only to Native Americans who hunted and fished there. That year, members of a fur trapping party led by Peter Skene Ogden visited the area.
Constructed in May 1901, the Pilot Butte Development Company's little plant was the first commercial sawmill in Bend. A small community developed around the area, and in 1904, a city was incorporated by a general vote of the community's 300 residents. On January 4, 1905, the city held its first official meeting as an incorporated municipality, appointing A. H. Goodwillie as the first mayor. In 1910, Mirror Pond was created by the construction of the Bend Water, Light & Power Company dam on the Deschutes River in Bend. The dam provided the city with its initial source of electricity.
A large influx of new residents drawn by Bend's lifestyle amenities, along with the low interest rates and easy lending that fostered a national housing boom in 2001-2005, resulted in increased activity in Bend's construction and real estate sectors and have caused the rate of home price appreciation in Bend to grow substantially during that period. In June 2007 it was named the most overpriced housing market in America. In May 2010 the Federal Housing and Finance Agency released a report in which Bend had the largest price drop in the country, 23%, from first quarter of 2009 to the first quarter of 2010.>>
[quote="Chris Peterson"][quote="RedFishBlueFish"]
I do wonder what the (non-auroral) skyglow is from on the horizon. The picture is taken facing north towards Polaris - so rising or setting Sun seems unlikely. K-Falls is in the wrong relative direction, as is Eugene. Bend, though sort of in the right geographical orientation, seems both too far away and too small to account for such brightness?[/quote]
Bend is [i]exactly [/i]in the right direction for the center of the light dome (just below Capella, at an azimuth of about 30° when the picture was taken), and puts out plenty of light to produce a dome like this in a long exposure image (it's only 90 miles away). Some of the glow probably comes from little towns like Chemult and even intersection lights along Hwy 97. Just one unshielded porch light a few miles distant can produce a noticeable glow on a 30-second starfield image.[/quote][quote=" http://en.wikipedia.org/wiki/Bend,_Oregon"]
[float=right][img3="[b][color=#0000FF]The Tower Theatre was built in 1940. The theatre's landmark 40-foot-tall tower is surrounded by more than 1,200 feet of neon tubes of green and gold.[/color][/b]"]http://upload.wikimedia.org/wikipedia/commons/d/d0/Tower_Theatre%2C_Bend_2008.jpg[/img3][/float]
<<Bend is Central Oregon's largest city with Bend's metro population was estimated at 170,705 as of July 1, 2009. The name Bend was derived from "Farewell Bend", the designation used by early pioneers to refer to the location along the Deschutes River where the town was eventually platted, one of the few fordable points along the river. For at least 12,000 years, until the winter of 1824, the Bend area was known only to Native Americans who hunted and fished there. That year, members of a fur trapping party led by Peter Skene Ogden visited the area.
Constructed in May 1901, the Pilot Butte Development Company's little plant was the first commercial sawmill in Bend. A small community developed around the area, and in 1904, a city was incorporated by a general vote of the community's 300 residents. On January 4, 1905, the city held its first official meeting as an incorporated municipality, appointing A. H. Goodwillie as the first mayor. In 1910, Mirror Pond was created by the construction of the Bend Water, Light & Power Company dam on the Deschutes River in Bend. The dam provided the city with its initial source of electricity.
A large influx of new residents drawn by Bend's lifestyle amenities, along with the low interest rates and easy lending that fostered a national housing boom in 2001-2005, resulted in increased activity in Bend's construction and real estate sectors and have caused the rate of home price appreciation in Bend to grow substantially during that period. In June 2007 it was named the most overpriced housing market in America. In May 2010 the Federal Housing and Finance Agency released a report in which Bend had the largest price drop in the country, 23%, from first quarter of 2009 to the first quarter of 2010.>>[/quote]