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<p> an entry from <a href="http://www.alpheratz.net/observing/"><i>Marc Murison's Amateur Astronomy Weblog</i></a>:<br> <b>NGC 6888 on August 16, 2004</b> <p> <a href='javascript:ImageWindow("http://www.alpheratz.net/images/observing/NGC6888_04-08-16.jpg",583,548,"external")'><img src="http://www.alpheratz.net/images/observing/NGC6888_04-08-16_thumb.jpg" width="160" height="150" align="left" style="margin-right: 5px; margin-bottom: 5px;" border="0" alt="" name=""></a> <a href="http://www.seds.org/~spider/ngc/ngc.cgi?ngc+6888" class="outlink" target="_blank">NGC 6888</a> on August 16, 2004. Prime focus (f/8.0). Total integration time 565×8.53 sec = 80 min. This is the famous Crescent Nebula, also number 27 in the Caldwell list. The bright star in the lower right, HD192163, is a Wolf-Rayet star. It blew off its outer atmosphere, revealing a hot stellar core whose intense radiation drives a massive stellar wind. The shock front resulting from this high-speed material plowing into the previously blown-off (and slower moving) outer atmosphere causes the glow we now see as the nebula. The whole nebula (about half is shown here) measures about 25×16 light years, and it is about 4700 ly distant. <br clear="all">

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