Software

How to set up Carte de Ciel (Sky Map, CdC) & PHD software for imaging & guiding – version 23/4/2020

After successfully managing to get guiding working earlier this week, I decided to write an outline of the process for (mainly) my own reference so that next time I would know what to do!

Not a perfect process – Damian made this comment:

Well done with regards to last night. I had a quick look at your screengrab on the blog. You didn’t have any calibration loaded – that’s why CAL is orange/yellow in the bottom right. The red DARK also suggests there are no darks for this connection..? Considering PHD had no data about your mount to go on, it did well!

….So still some way to go to improve it.

Click on link below to download process (PDF):

How to set up Carte de Ciel (Sky Map, CdC) & PHD software for imaging & guiding 230420

Andy

 

My First Mosaic – and how I did it.

Inspired by Geoff’s results I tried using the automerge in photoshop on my pictures of the Heart and Soul Nebulas. Oddly it only matched them if I selected the Soul first! Unfortunately it doesn’t rotate the images and my two sessions were at quite different angles for some reason.

I have combined images in photoshop before, but only on top of each other, never as a mosaic, but i decided to follow a similar path:

First I doubled the canvas size for the Soul image an imported the Heart as a layer on top.

I set opacity (opposite of transparency) of the heart image to 50%, and guided by stellarium to find the rough alignment it was easy to find a small asterism on both images. Zoomed in, I overlapped one of the stars in the asterism as accurately as I could. Circles of smeared stars around this point gave an idea of how much rotation would be needed.

using the select tool I then moved the centre marker of the Heart image over the centre of the aligned star and went to the edit menu to select ‘free transform’. This opens boxes where you can alter things like horizontal and vertical size and skew the image – not needed for images at the same scale. Instead I just used the ‘rotate’ box – this lest you enter angles in increments of +/- 0.05 degrees. This may sound a quite big step, but actually I’ve found it is small enough to align stars across a whole image. It’s easiest to step in whole degrees, then tenths of a degree and finish by using 0.05 degree to get the best possible result. It’s very obvious when you are aligned as the overlapping area suddenly looks much sharper.

I then changed to the magnifying glass tool – this brings up a box asking you if you want to apply the transformation – click yes if you are happy!

I then restored the Heart image to 100% opacity. It was clear it was less contrasty and a bit paler background. I used the ‘levels’ dialogue to alter gamma and black point until it looked a closer match to the Soul – you could also do this with curves. the whole thing might have been better if I had originally process the two images the same way.

Once they matched there was still an area of overlap with poor quality in the corner of the Heart image. I used the lasso tool with a feathered edge to remove most of this corner. A small patch still appeared too pale, so I lassoed it and changed its levels to match better.

This is the result, not perfect but not bad either:

Heart and Soul
Heart and Soul Nebulas

Decomposing images in GIMP2

Tonight, I took my first image of the Moon with my QHY10 camera/Equinox 80mm telescope.

The image should colour dispersion. I do have a dispersion corrector but it is 1.25 inch fitting and the QHY10 camera is definitely 2 inch fitting.

I found that this problem can be addressed using GIMP2 software – in this software there is a function called decomposition – this splits a colour image into separate individual RGB images.

I have described the process I followed in GIMP2 to decompose images below.

Andy

Original image in GIM2 showing colour dispersion:

Selecting decompose in GIMP2:

Selecting RGB in decompose:

Decompose in GIMP2 results in 3 separate layers for each colour – each image is presented greyscale & can be saved:

Jupiter 20-21 June 2019

I did 33 runs on Jupiter last night. The Red spot was well paced, as was Io transiting the planet, but although it’s shadow is clear there is only a hint of the moon.

My ADC made a huge difference.This was with the ZWO ASI120MC, x3 barlow and 150PL.

For this session, wavelets worked better than deconvolution giving a smoother result.

Jupiter
Jupiter
Jupiter
Jupiter
Jupiter
Jupiter