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Main Target tonight was M51 The Whirlpool galaxy and the recent Supernova


RayGil

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Birkrigg, Ulverston Cumbria

3rd June 2011

Main Target tonight was M51 The Whirlpool galaxy and the recently discovered Supernova SN2011dh.

Arrived at my main imaging site at aprox 22:25 arrived at Birkrigg, conditions were better than the previous night, only slight cloud drifting on the horizon. Set up the EQ5 and polar aligned, balanced the scope and fitted the canon 350D prime focus.

Once 3 star alignment had been successful, I tried point it various test objects to make sure alignment was centred correctly. Because I had plenty of time, I did a star tracking test and made some very slight adjustments.

At 23:44 I fitted the Bahtinov mask and did a focus test on Vega, then swung the scope over to M51 the Whirlpool galaxy and did a 30 second exposure, checked the image and zoomed in on the back of the camera to check for image trails, everything looked good, set the camera to ISO 1600 and 30 second exposures, and started imaging M51 at 23:47. I took 47 x 30 second exposures and then proceeded to take 20 blacks with the scope capped. I had great reservations on whether my equipment was capable of capturing Supernova SN2011dh, the SkyWatcher 120mm short tube refractor performed very well, and I think the supernova was at the limits of my tracking capabilities, but this will improve in the future when I finally get an auto-glider, but for now all my DSO images are unguided.

at about 00:45 i noticed a cloud bank drifting across and it was large, so I had a choice of either sitting it out or packing up for the night, I decided that packing up was the best option, I had achieved my goal for the night, imaging M51.

raygil-albums-m51-supernova-picture11657-supernova-m51-my-images-taken-1-month-apart.jpg

raygil-albums-m51-supernova-picture11627-m51-supernova.jpg

Ray

Cumbrian Skies

13 Comments


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Thanks Isabelle, it's difficult to capture being unguided but it was certainly worth a try!

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I have a Messier list as well and am currently using the TUMOL R3.0 to organize all the deep space objects I have seen so far. I will definitely visit your site!

Isabelle

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i have not see niether to date ,to much lp at my house but will get to see it soon a hope nice pics

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ps its a great pic you should try adding 15x 1`4000 of a sec i added them to one of mine also stretch a old white t shirt over the end of the scope and shine a bright light at it and take 15 x subs of that let the camera sort the speed and all the rest out put it on auto the bias lights will lift your pics i tried it the other night on some wide field shots it made a big diference i love the pics you did and are very jelous i only have a 90mm refractor and with the light pol i have here its just a dream at the min the 12"reflector is on a non motor base so thats a pain

pat

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Hello Pat & Isabelle.

Thanks for the comments, I will look at adding bias sub's thanks for the info, up to now it has been a work in progress, and a lot of trial and error, I have to travel to my dark site for photography, so it means setting everything up from scratch each night. At present I'm just allowing the mount to guide, have made lot's of adjustments and learnt various tricks to get decent tracking, to really improve I will be getting a autoglider at some stage, the Skywatcher stand alone one looks the best option for me, will allow less gear to be taken. The autoglider will allow longer exposures and bring out the detail of the DSO, but that's for the future, for now I will have to keep the images unguided and short exposures. I have only used the 120mm refractor for imaging, being wide-field it's easier to track, my 200p suffers from star trails in the images, but this is where the autoglider will help.

Pat: good luck with the 250mm reflector I hope you get one!

Ray

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