{"id":6170,"date":"2015-01-31T10:11:44","date_gmt":"2015-01-31T14:11:44","guid":{"rendered":"http:\/\/starlightcascade.ca\/blog\/?p=6170"},"modified":"2015-02-13T09:58:06","modified_gmt":"2015-02-13T13:58:06","slug":"jupiter-20150130","status":"publish","type":"post","link":"https:\/\/starlightcascade.ca\/blog\/2015\/01\/jupiter-20150130\/","title":{"rendered":"Jupiter 20150130"},"content":{"rendered":"
\"Jupiter\"<\/a>
Jupiter<\/figcaption><\/figure>\n

Friday evening, early cause it was getting cold, I went out and was upgrading the learning curve of imaging by switching from the 20cm dobsonian (fl=1200mm) and a drift scan method to a 10cm Meade SC (fl=1000mm) equatorially mounted with a motor that does the RA tracking.<\/p>\n

Jupiter was only 17 deg above the horizon at 19:00 EST and the more than half full moon was quite noticeable. What was noticeable was the -15C
\nBut, once Jupiter was in the field of field with an eyepiece, it held centered quite well.
\nThe asi120mc camera went in, replacing the eyepiece, and it took just a little while to get the focus, even with the superstiff focuser knob.<\/p>\n

Surprisingly, the optimum exposure was still 5ms, same as with the much larger 20cm dobsonian..
\nletsee.. area=pi*r^2, MeadeSC would be pi*50^2=7850mm^2
\nthe Skywatcher dob would be pi*200^2=125600mm^2
\nor x16 as much gross area.<\/p>\n

You would think that would affect the exposure in some way!<\/p>\n

In ay event, the image is not quite as big (1200mm vs 1000mm) but it is in the field of view much longer (still does drift a little).
\nI ran 5 sets of exposures, through out three, leaving two. Hey! I can still do arithmetic!<\/p>\n

Viewing the raw .avi video (131MB), it looks horrible!
\nRan them both through autostakkert! and one was better than the other.<\/p>\n

Tested using 10%, 25%, 20%, 75% and 90% of the frames.
\nWe can see a difference in the 10% from the rest. The rest look very similar.
\nThis image comes from 4870 images (gross) and uses 75% of the frames.<\/p>\n

So here it is, a 230×230 pixel 9KB image:<\/p>\n

Can’t wait to step it even more with
\n1) a higher in the sky Jupiter
\n2) start with a x2 barlow<\/p>\n

Love this camera!
\neven with the crappy old netbook (upgraded to 2GB RAM and a 60GB SSD) and a USB2 camera, it can capture near 192 frames\/second, or 4800 in 25 seconds (actual exposure).<\/p>\n","protected":false},"excerpt":{"rendered":"

Friday evening, early cause it was getting cold, I went out and was upgrading the learning curve of imaging by switching from the 20cm dobsonian (fl=1200mm) and a drift scan method to a 10cm Meade SC (fl=1000mm) equatorially mounted with a motor that does the RA tracking. Jupiter was only 17 deg above the horizon […]<\/p>\n","protected":false},"author":494,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":["post-6170","post","type-post","status-publish","format-standard","hentry","category-astronomy"],"_links":{"self":[{"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/posts\/6170","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/users\/494"}],"replies":[{"embeddable":true,"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/comments?post=6170"}],"version-history":[{"count":0,"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/posts\/6170\/revisions"}],"wp:attachment":[{"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/media?parent=6170"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/categories?post=6170"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/starlightcascade.ca\/blog\/wp-json\/wp\/v2\/tags?post=6170"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}