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orion-telescopes · Orion Telescopes

Group Information

  • Members: 1489
  • Category: Telescopes
  • Founded: Sep 18, 2001
  • Language: English
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Activity within 7 days:

64 New Messages - 18 New Photos - 1 New File - New Questions

Description

Welcome to Orion-Telescopes astronomy forum, where we discuss not only all products and topics related to Orion, but any other brands, types or models of telescope that you have or we know about; all types of telescopes and discussions are welcome here on anything relating to telescopes, optics, eyepieces, astronomy, theory, physics or of the general group interest. We touch all bases and are considered an excellent reference forum for a vast array of sound information that few groups can match, as well as a very interesting and diverse member base.

We invite your questions, ideas, input, observing reports and images to be shared; we only ask that everyone treat each other with common courtesy.

All members are invited to join our Flickr group to display higher resolution astro and equipment photos.

http://www.flickr.com/groups/orion-telescopes/
(This link is clickable below)

Shown here: The beautiful Springtime pinwheel galaxy M101 in the northern constellation of the Great Bear, discovered in 1781 by Paul Mechain. Being of low surface brightness due to its being face-on and rather large (about 20 minutes of arc diameter), it was described by Admiral Smyth in 1844 as being "seemingly caused by a vast agglomeration of stars whose paleness tells of inconceivable distance. . ."

Moving away from us at over 250 miles per second, M101 is about 15 million light-years away. This Sc type spiral is slightly smaller than our own Milky Way, but appears to only have about 10% of the mass, and is one of the bluest galaxies known, being comprised chiefly of Population I stars.

This image (center-cropped for better presentation here) taken by Michel Fleureau from Castres in Southern France using the Orion 8-inch f/5 newt at prime focus and SSAG/Ph.D. on an Atlas EQ-G mount, using a stock Canon EOS 450D, MPCC Baader coma-corrector, and an Astronomik CLS light pollution filter. He used IP 3.80, PS8, and Noiseware for post-processing.

Exposure: 128 minutes (32 X 240 second)

Message History

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2012 314 211 250 286 157
2011 255 307 179 241 120 145 118 358 375 180 127 230
2010 238 192 344 449 467 287 184 245 309 448 207 200
2009 78 54 67 176 169 399 376 391 452 693 232 239
2008 10 14 28 10 11 10 12 7 27 66 82 67
2007 26 28 15 28 16 26 5 2 15 43 31 20
2006 189 115 128 127 36 22 13 101 63 37 35 17
2005 253 203 227 78 37 86 149 229 89 134 94 110
2004 164 373 299 207 209 220 160 121 116 198 148 142
2003 87 45 58 22 19 14 31 58 44 194 223 294
2002 19 33 53 47 16 13 39 20 26 24 28 34
2001 21 18 35 9
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