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Solar Gravity 2018

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11
Solar Images / Raspberry Pi Annalemma
« Last post by tomhow on 19:23:25, 15 June, 2018  »
Between June 2016 and June 2017 I ran an Annalemma experiment on a Raspberry Pi.
I've had an unenforced break from Astronomy, but now i get around to looking at the result properly.

The setup was as follows:
  • The Pi3 and Pi Camera was mounted in a box screwed to the outside wall of my house, pointing south
  • This gives a roughly 40 degree wide field of view
  • The Pi was programmed to take an exposure every 5 mins day and night, adjusting the ISO and exposure to suit the conditions. These images were stored on a network hard disk.
  • Each frame was ftped into the same place on a website, so i could use it as a weathercam
  • At Noon each day it took a very short exposure to capture the disk of the Sun. Turns out even the shortest exposure is too bright, so I rigged up an ND400 filter on a solenoid to move in front of the lens for this noon exposure
  • The Pi was programmed to stack all the accumalated noon images each day to produce an ongoing annalemma. Much excitment each day to check the website at Noon. Especially when away from home.
  • Some days were cloudy: No sight of the solar disk
  • The program also inscribed each image with the annotation at the bottom
  • Ignore the "cloud" calculation. That never worked at night.
  • The "Sun Angle" was calculated in my program using fairly standard algorithms.


I do have a hard disk somewhere with an entire year of 5 minute images, but the image presented here is a a stack of the annalemma images laid on top of a random shot in the middle of the night.
This nicely shows the night time sensitivity along with a handy meteor.

There are a couple of pictures of the "box". It is harder than you might think to bolt such a thing to the wall pointing in the right direction when the house isn't perfectly aligned to the compass points!

Unfortunately most the last week or two of the run was cloudy, and in the final days it was VERY hot and the ND filter jammed, so the final annalemma wasn't perfect, but I ain't trying again!

The program running this was written entirely in C++ using the CodeBlocks IDE on the Pi.







12
Product Announcements / Complete Image Data Sets Now Available.
« Last post by MRPUGH55 on 11:25:09, 15 June, 2018  »
Hello everyone.

I am now populating my website with complete image data sets that are available for purchase (via Paypal).

Currently, all of these data sets were taken with the CDK17 when it was parked at Sierra Remote Observatories and the vast majority of them contain between 20-50 hours of exposure, and there are some mosaics in there too.

I have pushed up the data for two objects so far, but have provided a 'slide show' of what is also available so as to give you a heads up as to what is coming.  It just takes a very long time to get the data together and build the pages.  If you see something on that slide show that interests you just contact me and I can make it available.

I would like to say that the data is all very high quality, some of it was taken with an Apogee U16M and some with the SBIG STXL11002 all AOX guided.

Here is the link:
https://www.martinpughastrophotography.space/data-set-index

cheers
Martin
13
Planetary Images / Re: Jupiter 01/06/2018 [Smartphone]
« Last post by Roger B on 20:34:58, 14 June, 2018  »
Very impressive

Rog
14
Planetary Images / Re: Jupiter 11/06/2018 [DSLR]
« Last post by petevasey on 21:46:17, 13 June, 2018  »
Nice colours and good detail.  Perhaps a little over sharpened.  I find one or even two applications of despeckle in Photoshop produces (for me anyway) a more natural looking image in this case.  But beauty is in the eye of the beholder  ;)

Cheers,

Peter. 
15
Newcomers Corner / Re: Canon 1100D or 100D for Imaging
« Last post by Einari on 07:36:55, 13 June, 2018  »
Well, 100D is newer generation and has slightly better sensor than 1100 and also is lighter.
But I wonder if you see difference in images in real life.
Bigger difference if you get the camera astro modified.
16
Beginners Images / Re: My attempt at M51
« Last post by Roger B on 19:47:41, 12 June, 2018  »
Lovely start.   

Rog
17
Deep Sky Images / Re: M 82
« Last post by bmgscott on 19:07:36, 12 June, 2018  »
Fantastic image 👍
18
Newcomers Corner / Canon 1100D or 100D for Imaging
« Last post by gfletcher on 17:49:06, 12 June, 2018  »
Hi Guys

I am getting a Canon 100D ( not the 1000D) and was wondering if there is any benefit over my 1100D for prime focus imaging through my 200p Newtonian.

look forward to any constructive replies?

Graham
19
Beginners Images / Re: My attempt at M51
« Last post by clive on 12:49:23, 12 June, 2018  »
Very nice m51
20
Beginners Images / Re: My attempt at M51
« Last post by Einari on 12:32:27, 12 June, 2018  »
After 6 weeks I would be proud of that.
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