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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>M13, M27, M57, and NGC 5466 on 17 June 2005</b> <p> <p><a href='javascript:ImageWindow("http://www.alpheratz.net/images/observing/M13_2005-06-17.jpg",600,560,"external")'><img src="http://www.alpheratz.net/images/observing/M13_2005-06-17_thumb.jpg" width="161" height="150" align="left" style="margin-right: 5px; margin-bottom: 5px;" border="0" alt="" name=""></a> <br /> <a href="http://www.seds.org/messier/m/m013.html" class="outlink" target="_blank">M13</a>.  Total integration time 137×8.53 sec = 19.5 min. <br /> <br clear="all"> <br /> <a href='javascript:ImageWindow("http://www.alpheratz.net/images/observing/M27_2005-06-17.jpg",595,540,"external")'><img src="http://www.alpheratz.net/images/observing/M27_2005-06-17_thumb.jpg" width="165" height="150" align="left" style="margin-right: 5px; margin-bottom: 5px;" border="0" alt="" name=""></a> <br /> <a href="http://www.seds.org/messier/m/m027.html" class="outlink" target="_blank">M27</a> (the Dumbbell Nebula).  Total integration time 419×8.53 sec = 60 min. <br /> <br clear="all"> <br /> <a href='javascript:ImageWindow("http://www.alpheratz.net/images/observing/M57_2005-06-17.jpg",540,480,"external")'><img src="http://www.alpheratz.net/images/observing/M57_2005-06-17_thumb.jpg" width="169" height="150" align="left" style="margin-right: 5px; margin-bottom: 5px;" border="0" alt="" name=""></a> <br /> <a href="http://www.seds.org/messier/m/m057.html" class="outlink" target="_blank">M57</a> (the Ring Nebula).  Total integration time 280×8.53 sec = 40 min.  The V magnitudes shown are from <a href="ftp://ftp.nofs.navy.mil/pub/outgoing/aah/sequence/m57.dat" target="_blank" class="outlink">photometry of M57 field stars</a> taken by Arne Hendon (USNO-Flagstaff).  See <a href="http://c3po.cochise.cc.az.us/astro/deepsky02.htm" target="_blank" class="outlink">Brian Skiff’s page</a> on M57 field star photometry for more information. <br /> <br clear="all"> <br /> <a href='javascript:ImageWindow("http://www.alpheratz.net/images/observing/NGC5466_2005-06-17.jpg",540,530,"external")'><img src="http://www.alpheratz.net/images/observing/NGC5466_2005-06-17_thumb.jpg" width="153" height="150" align="left" style="margin-right: 5px; margin-bottom: 5px;" border="0" alt="" name=""></a> <br /> <a href="http://www.seds.org/~spider/ngc/ngc.cgi?ngc+5466" class="outlink" target="_blank">NGC 5466</a> on June 17, 2005.  Prime focus (f/8.0).  Total integration time 349×8.53 sec = 50 min.  This is a faint, sparse globular cluster, roughly 52,000 light years distant. <br /> <br clear="all"> <br /> </p>

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