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	<title>Sky this Week &#187; Arp Galaxy</title>
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	<link>http://www.skythisweek.com</link>
	<description>Occasional observations of an amateur astronomer</description>
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		<title>Stephan&#8217;s Quintet (Arp 319)</title>
		<link>http://www.skythisweek.com/2006/10/02/stephans-quintet-arp-319/</link>
		<comments>http://www.skythisweek.com/2006/10/02/stephans-quintet-arp-319/#comments</comments>
		<pubDate>Tue, 03 Oct 2006 02:40:15 +0000</pubDate>
		<dc:creator>Vern</dc:creator>
				<category><![CDATA[Arp Galaxy]]></category>
		<category><![CDATA[Astronomy]]></category>
		<category><![CDATA[Galaxy]]></category>
		<category><![CDATA[Galaxy cluster]]></category>

		<guid isPermaLink="false">http://www.raben.com/weblog/2006/10/02/stephans-quintet-arp-319/</guid>
		<description><![CDATA[Stephan&#8217;s quintet (NGC 7317, 7318A, 7281B, 7319, and 7320) in the constellation Pegasus is a grouping of 5 galaxies in a 3.5 arc-min area. The largest and brightest of the group, NGC 7320, is located in the lower left of center. Due to difference in red shift, the conventional view  is that NGC 7320 is not part [...]]]></description>
			<content:encoded><![CDATA[<p>Stephan&#8217;s quintet (NGC 7317, 7318A, 7281B, 7319, and 7320) in the constellation Pegasus is a grouping of 5 galaxies in a 3.5 arc-min area. The largest and brightest of the group, NGC 7320, is located in the lower left of center. Due to difference in red shift, the conventional view  is that <a href="http://www.noao.edu/image_gallery/html/im0414.html">NGC 7320 is not part of the other 4 galaxies in the group</a>. It is instead actually part the nearby NGC 7331 group.  However there is evidence of a connecting tail extending from 7320 which implies interaction with the the other galaxies. Some astronomers, such as <a href="http://www.haltonarp.com">Halton Arp</a>, maintain that because of this the current beliefs about red shift should be re-examined. </p>
<p>The galaxies 7318A and B located near the center of the image are quite interesting as well. Not only are they interacting but they also have differing red-shifts. Galaxy 7318B is currently moving toward the others at high speed setting up a <a href="http://www.spitzer.caltech.edu/features/articles/20060303.shtml">tremendous shock wave</a> larger than our own milky way galaxy in size.</p>
<p>  </p>
<p><img title="Stephan's quintet" alt="Stephan's quintet" src="http://www.raben.com/deepsky/ngc7320-2006-09-30-0544.jpg" /></p>
<p>Location was Crow Valley Campground in the Pawnee Grasslands just north of Briggsdale, CO. Temperature was 44°F and humidity was 56%. The sky was mostly clear with a few thin clouds, no wind, turbulence around 6/10, and transparency varied from good to very good. Fifteen minutes of video taken with Celestron Nexstar11 telescope, APT wedge, Meade F3.3 focal reducer, and a Astrovid Stellacam II video camera. Camera set at 9/14 gain, integrate 256 (8 sec), and medium gamma. Images were dark subtracted and flat field corrected with ImagePlus, aligned and stacked with Registax3.</p>
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		<title>NGC 6621 and 6622 Arp 81</title>
		<link>http://www.skythisweek.com/2006/05/22/ngc-6621-and-6622-arp-81/</link>
		<comments>http://www.skythisweek.com/2006/05/22/ngc-6621-and-6622-arp-81/#comments</comments>
		<pubDate>Mon, 22 May 2006 20:33:24 +0000</pubDate>
		<dc:creator>Vern</dc:creator>
				<category><![CDATA[Arp Galaxy]]></category>
		<category><![CDATA[Astronomy]]></category>
		<category><![CDATA[Galaxy]]></category>

		<guid isPermaLink="false">http://www.raben.com/weblog/2006/05/22/ngc-6621-and-6622-arp-81/</guid>
		<description><![CDATA[NGC 6621 and NGC 6622 (Arp 81) are a strongly interacting pair of galaxies in the constellation Draco. The tidal arm extending up and to the left of NGC 6622 is just barely visible in the below image. Image was taken on May 21, 2006 at 01:53 am MDT with Celestron Nexstar11 telescope, Meade F3.3 [...]]]></description>
			<content:encoded><![CDATA[<p>NGC 6621 and NGC 6622 (Arp 81) are a strongly interacting pair of galaxies in the constellation Draco. The tidal arm extending up and to the left of NGC 6622 is just barely visible in the below image. Image was taken on May 21, 2006 at 01:53 am MDT with Celestron Nexstar11 telescope, Meade F3.3 focal reducer, and Astrovid Stellcam2 video camera. Temperature was 59°F, sky clear, transparency very good, no wind, location Lousiville, CO.</p>
<p><img alt="Image of NGC 6621/6622 Arp 81" title="Image of NGC 6621/6622 Arp 81" src="http://www.raben.com/deepsky/ngc-6621_6622-2006-05-21.jpg" /></p>
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		<title>NGC 4435 and NGC 4438, ARP 120</title>
		<link>http://www.skythisweek.com/2006/05/16/ngc-4435-and-ngc-4438-arp-120/</link>
		<comments>http://www.skythisweek.com/2006/05/16/ngc-4435-and-ngc-4438-arp-120/#comments</comments>
		<pubDate>Tue, 16 May 2006 19:10:58 +0000</pubDate>
		<dc:creator>Vern</dc:creator>
				<category><![CDATA[Arp Galaxy]]></category>
		<category><![CDATA[Astronomy]]></category>
		<category><![CDATA[Deep sky]]></category>
		<category><![CDATA[Galaxy]]></category>

		<guid isPermaLink="false">http://www.raben.com/weblog/2006/05/16/ngc-4435-and-ngc-4438-arp-120/</guid>
		<description><![CDATA[Located 20 arc-minutes east of M86 in the constellation Virgo is a pair of galaxies known as &#8220;the eyes&#8221;. According to the Chandra website, it is thought that these galaxies had a glancing collision about 100 million years ago. Both galaxies appear elognated in the NNE to SSW direction. 
Image taken with Celestron Nexstar 11, [...]]]></description>
			<content:encoded><![CDATA[<p>Located 20 arc-minutes east of M86 in the constellation Virgo is a pair of galaxies known as &#8220;the eyes&#8221;. According to the <a title="Link to Chandra discussion of NGC 4435/4438" href="http://chandra.harvard.edu/photo/2003/ngc4438/">Chandra website</a>, it is thought that these galaxies had a glancing collision about 100 million years ago. Both galaxies appear elognated in the NNE to SSW direction. <img title="Image of NGC 4435 and 4438, ARP 120" alt="Image of NGC 4435 and 4438, ARP 120" src="http://www.raben.com/deepsky/ngc-4435-2006-05-16-0417ut.jpg" /></p>
<p>Image taken with Celestron Nexstar 11, Meade F3.3 focal reducer. and Astrovid Stellacam II video camera. Integration set at 256 (8.5 second exposure), gain 9/14, and medium gamma. Images flat field, dark subtracted, and bias adjusted, 20 minute stack. Sky was clear, transparency was very good, turbulence fair 5/10, no wind, and temperature was 57 °F.</p>
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		<item>
		<title>NGC 4038 &#8211; 4039 (Arp 244), the ring-tail galaxy</title>
		<link>http://www.skythisweek.com/2006/04/20/ngc-4038-4039-the-ring-tail-galaxy/</link>
		<comments>http://www.skythisweek.com/2006/04/20/ngc-4038-4039-the-ring-tail-galaxy/#comments</comments>
		<pubDate>Thu, 20 Apr 2006 21:38:46 +0000</pubDate>
		<dc:creator>Vern</dc:creator>
				<category><![CDATA[Arp Galaxy]]></category>
		<category><![CDATA[Astronomy]]></category>
		<category><![CDATA[Deep sky]]></category>
		<category><![CDATA[Galaxy]]></category>

		<guid isPermaLink="false">http://www.raben.com/weblog/2006/04/20/ngc-4038-4039-the-ring-tail-galaxy/</guid>
		<description><![CDATA[Below is an image of NGC 4038 and 4039 in the constellation Corvus. This interesting pair of galaxies which are believed to be a colliding.  NGC 4038 to the north or top in the image contains several dark patches. No sign of the the &#8220;antennae&#8221; that Hubble images show &#8212; I guess I need [...]]]></description>
			<content:encoded><![CDATA[<p>Below is an image of NGC 4038 and 4039 in the constellation Corvus. This interesting pair of galaxies which are believed to be a colliding.  NGC 4038 to the north or top in the image contains several dark patches. No sign of the the <a title="Hubble image of ngc 4038 and 4039" href="http://imgsrc.hubblesite.org/hu/db/1997/34/images/p/formats/web.jpg">&#8220;antennae&#8221;</a> that Hubble images show &#8212; I guess I need a bit more aperature! <a title="More information and images on Hubblesite.org" href="http://hubblesite.org/newscenter/newsdesk/archive/releases/1997/34/image/b">Hubblesite.org</a> has discussion and images of star forming regions resulting from the collision.</p>
<p>Below image taken between 11:20 MDT and 11:40 MDT last evening, April 19, 2006 with a Celestron Nexstar11 telescope mounted on APT wedge, a Meade F3.3 focal reducer, and an Astrovid Stellacam2.  Temperature was 43°F, no wind, transparency was very good, and turbulence was 5/10.</p>
<p><img title="Image of NGC 4038 and ngc 4039" alt="Image of NGC 4038 and ngc 4039" src="http://www.raben.com/deepsky/ngc-4038-2006-04-20.jpg" /></p>
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		</item>
		<item>
		<title>NGC 3395/3396 (ARP 270)</title>
		<link>http://www.skythisweek.com/2006/04/17/ngc-33953396-arp-270/</link>
		<comments>http://www.skythisweek.com/2006/04/17/ngc-33953396-arp-270/#comments</comments>
		<pubDate>Mon, 17 Apr 2006 21:23:20 +0000</pubDate>
		<dc:creator>Vern</dc:creator>
				<category><![CDATA[Arp Galaxy]]></category>
		<category><![CDATA[Astronomy]]></category>
		<category><![CDATA[Deep sky]]></category>
		<category><![CDATA[Galaxy]]></category>

		<guid isPermaLink="false">http://www.raben.com/weblog/2006/04/17/ngc-33953396-arp-270/</guid>
		<description><![CDATA[While searching for comet 43P last night (didn&#8217;t find it), I took a break from the search for a while and imaged NGC 3395 and 3396.
NGC 3395 and 3396 are a fairly bright pair of galaxies (visual magnitude 12.1) in constellation Leo Minor.  Both galaxies are at an estimated distance of 85 million light [...]]]></description>
			<content:encoded><![CDATA[<p>While searching for comet 43P last night (didn&#8217;t find it), I took a break from the search for a while and imaged NGC 3395 and 3396.</p>
<p>NGC 3395 and 3396 are a fairly bright pair of galaxies (visual magnitude 12.1) in constellation Leo Minor.  Both galaxies are at an estimated distance of 85 million light years and are thought to be in the process of merging. UV observations with the Hubble telescope have found knots of material believed to be star forming regions in both galaxies.</p>
<p>NGC 3396 is to the upper left and 3395 is at a right angle and down in below image (north is approximately up and east to the left).</p>
<p><img title="Image of galaxies ngc 3395 and 3396" alt="Image of galaxies ngc 3395 and 3396" src="http://www.raben.com/deepsky/ngc3396-2006-04-17.jpg" /></p>
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		<item>
		<title>Messier 51</title>
		<link>http://www.skythisweek.com/2006/04/04/messier-51/</link>
		<comments>http://www.skythisweek.com/2006/04/04/messier-51/#comments</comments>
		<pubDate>Tue, 04 Apr 2006 18:50:28 +0000</pubDate>
		<dc:creator>Vern</dc:creator>
				<category><![CDATA[Arp Galaxy]]></category>
		<category><![CDATA[Astronomy]]></category>
		<category><![CDATA[Deep sky]]></category>
		<category><![CDATA[Galaxy]]></category>

		<guid isPermaLink="false">http://www.raben.com/weblog/2006/04/04/messier-51/</guid>
		<description><![CDATA[I decided to try taking some images of Messier 51 with the Canon 300D last evening despite partly cloudy skies and a crescent moon. Transparency was generally good though there were occasional thin clouds, temperature 45°F, turbulence 6/10. Equipment used as Celestron Nexstar11, Celestron F6.2 focal reducer, and Canon 300D.  I handguided for around [...]]]></description>
			<content:encoded><![CDATA[<p>I decided to try taking some images of Messier 51 with the Canon 300D last evening despite partly cloudy skies and a crescent moon. Transparency was generally good though there were occasional thin clouds, temperature 45°F, turbulence 6/10. Equipment used as Celestron Nexstar11, Celestron F6.2 focal reducer, and Canon 300D.  I handguided for around 40 minutes to obtain 16, 2 minute exposurers at ASA 400. ImagePlus software was used to dark subtract, flat field correct, stack, and align the best 8 of 16 images.</p>
<p>Wider field versions are available <a title="M51 in 1600x1200 wallpaper size" href="http://www.raben.com/deepsky/m51-2006-04-04-1.jpg">1600&#215;1200</a>, <a title="M51 in 1280x1024 wallpaper size" href="http://www.raben.com/deepsky/m51-2006-04-04-2.jpg">1280&#215;1024</a>, <a title="M51 in 1024x768 wallpaper size" href="http://www.raben.com/deepsky/m51-2006-04-04-3.jpg">1024&#215;768</a>, and <a title="M51 in 800x600 wallpaper size" href="http://www.raben.com/deepsky/m51-2006-04-04-4.jpg">800&#215;600</a>.</p>
<p>Messier 51 (NGC 5194), the whirlpool galaxy in Canes Venatici is thought to be quite similar to our own Milky Way galaxy in mass, size, and luminosity. M51 is an excellent example of a face-on spiral that can be seen in a small telescope (8&#8243;) under a dark sky.  It is believed to be interacting gravitationally with is neighbor to the north, NGC 5195.</p>
<p><img alt="Image of Messier 51" title="Image of Messier 51" src="http://www.raben.com/deepsky/m51-2006-04-04-0446.jpg" /></p>
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		<title>M51 on Jan 29, 2006</title>
		<link>http://www.skythisweek.com/2006/01/29/m51-on-jan-29-2006/</link>
		<comments>http://www.skythisweek.com/2006/01/29/m51-on-jan-29-2006/#comments</comments>
		<pubDate>Mon, 30 Jan 2006 05:36:17 +0000</pubDate>
		<dc:creator>Vern</dc:creator>
				<category><![CDATA[Arp Galaxy]]></category>
		<category><![CDATA[Astronomy]]></category>
		<category><![CDATA[Deep sky]]></category>
		<category><![CDATA[Galaxy]]></category>
		<category><![CDATA[Observing]]></category>

		<guid isPermaLink="false">http://www.raben.com/weblog/2006/01/29/m51-on-jan-29-2006/</guid>
		<description><![CDATA[Last evening I met up with fellow amateur astronomers at the Crow Valley Campground near Briggsdale, CO. It was quite cloudy when I arrived about half an hour after sunset. We spent a couple hours talking about good times last summer and making plans for possible star party trips to the Texas Star Party, northwestern [...]]]></description>
			<content:encoded><![CDATA[<p>Last evening I met up with fellow amateur astronomers at the Crow Valley Campground near Briggsdale, CO. It was quite cloudy when I arrived about half an hour after sunset. We spent a couple hours talking about good times last summer and making plans for possible star party trips to the Texas Star Party, northwestern Nebraska, Mt. Evans, CU Mountain Observatory, and our favorite, Fox Park, Wyo. The sky cleared shortly after 8pm. It was fairly cold, around 8 degrees F, but fortunately very little wind.</p>
<p>I set up the 300D to take some time exposures, but was quite dismayed when I remembered that the batteries were still in the charger back at home! Fortuanately, I had brought along the Stellacam2 so I set it up on the Celestron Nexstar11 with a 0.33 focal reducer.  I was quite pleased to discover that I could set the gain very high (12/14) and still not have much background noise.  Normally I can only set to about 8 or 9/14.</p>
<p>Around 00:30 I took this image of M51 and its companion to the north NGC 5195.</p>
<p><img alt="Image of Messier 51 and NGC 5195" title="Image of Messier 51 and NGC 5195" src="http://www.raben.com/deepsky/m51-2006-01-29-0038.jpg" /></p>
<p>At the same time I was imaging this, my friend Gary was looking at it in his 30 inch dob nearby.  It was really cool to compare the views. M51 is an awesome object in his 30 inch.  The spiral arms are absolutely amazing to trace and dark lane extending below NGC 5195 is very apparent.  The image on the notebook from the Stellacam2 is pretty stunning as well. The image is much noisier, but the same structures can be seen.  Still though, it just can&#8217;t compare to the view through a large scope at dark site.</p>
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