Astrophotography

Solargraph

I took down the RAG Solargraph that had been in place on the front wall of my house all last year and finally got around to scanning it in.

It was scanned at 1200 DPI, the highest resolution available on my printer/scanner, then rotated and flipped.  It took a while for me to realise that the flip was necessary in order to work out what I was looking at.  Seems obvious, in hindsight!  Then I created a negative image (thereby making the negtive positive) and cropped the edge beyond the south-west as it contained nothing but the shadow of the house next door.

Here is the result.  Apart from the above, the image is not doctored in any way.  Playing around with colours and sharpness didn’t seem to add anything useful, so I’ve stayed with the original settings.  You can just make out the image of my campervan, slightly west of south.  I’ve a better view to the east, but couldn’t quite catch the sunrise itself.  Silhouettes of trees and houses are vsisble along the skyline.  The white dots are street lights and ‘security’ lights that couldn’t be avoided (short of covering the camera up over night, every night).

It was an interesting experiment and the result is actually better than I expected, so I’m quite pleased with this.

Derry North

M16 this summer.

This is the image I shared in tonight’s meeting, M16 the Eagle Nebula and cluster in Ha, with the ‘Pillars of Creation’ in the middle. Nearly 3 hours (34 5-minute exposures).

M16 Ha
M16 Ha

I also grabbed a luminance layer for the globular cluster M14 to use with my RGB data, and this Luminance only image of M11 to add to my ‘Messier Collection’.

This is classifies as an open cluster despite being quite compact, to me it looks more like a small but raggedy globular!

 

M11 The Wild Duck Cluster
M11 The Wild Duck Cluster

Solar disc in Calcium H 25/6/2020

Hot on the heels of my Daystar Hydrogen Alpha Quark-filtered image in my previous post, I have now taken some images using my Daystar Calcium-H filter on the same scope and with same camera.

…Well I am on a roll – why not?

I have taken images using variety of settings – still need to decide which is best – so here are two images at opposite extremes of settings on the Calcium-H Quark.

Andy

My best ever image of solar surface – yippee!

I have managed to get flat frame and dark frame to work in FireCapture – turned out to be really ease to get flat frame after all – just completely defocus the image of the solar disc with Quark still in, slightly adjust image so not at edge sun but in middle (when defocused adjust using mount hand control until reasonably bright across whole image no darkening near one edge), move exposure length slider (NOT gamma) until top histogram 1/3 from top edge, click on flat frame box and it will take flat frame. Dark frame, simply cover scope and press dark frame click box. Now flat and darks are automatically subtracted constantly – nothing else needs to be done……and Newtons rings are magically gone. Wow!

So here is my best ever image of the sun from today – notice the two dust bunnies – sorry about those!

Also (thanks Damian for the advice), I have tested my Quark H at different settings – and on my Quark best setting is (as Damian suggested) -5. No wonder I couldn’t get good photos in past when I was trying +3, following advice I’d received from another source that best setting on Quarks was 0-+3.

  • Sky Watcher Equinox 100mm OTA
  • HEQ5 Pro Mount.
  • ZWO ASI 174MM USB 3.0 Camera

Andy