Daylight spectrum analysed with PCSpectra Software

I captured my previous spectrum using software which appears to be not compatible with the PCSpectra Software that came with the CCDSPEC Spectrometer.

I have now purchased Nebulosity 4 software as recommended by Dr Elliott and this makes a massive difference – allowing me to conduct analyses as below.

The following are from a daylight spectrum recorded at approx. 18:20 on 22/7/2018 simply by pointing the CCDSPEC spectrometer with QHY6 camera (without cooling turned on) at the window in our home study and recorded 0.2 second exposure using Nebulosity 4 software running under Windows 10 (64 bit) on my Dell Inspiron 15 5000 series laptop. Image was saved as FIT file and analysed with PCSpectra Software using settings and options stated in the manual that came with the CCDSPEC.

The link below is to allow download of the calibration file used for the wavelength calibration in one of the images below. This calibration file is specific for the particular CCDSPEC+QHY6 camera combination and was created by Dr Elliott and supplied with the equipment. It needs to be included in each folder with spectra in order for the PCSpectra Software to provide output in wavelength rather than pixels on x-axis.



Access the original FIT file here:

Daylight with CCDSPEC 220718@1821 FIT file

Image of the spectrum in this FIT file:

Daylight with CCDSPEC 220718@1821-XAxisProjection.bmp – this image shows pixels:

However the inclusion of the calibration file created by Dr Elliott for my CCDSPEC and QHY6 combination allows the x-axis pixels to be converted into wavelength:

Daylight with CCDSPEC 220718@1821-YAxisProjection.bmp:

Daylight with CCDSPEC 220718@1821-Histogram.bmp:

First spectrum of daylight with CCDSPEC Spectrometer

First spectrum with CCDSPEC Spectrometer “First Light” – taken with cap off and QHY6 camera – no telescope – I just pointed it out of the window yesterday afternoon 19/7/2018. I have compared it to Dr Elliott’s sample daylight spectrum that was included with the device.

I am pleased to see that my daylight spectrum (bottom one of pair in picture below – taken 19/7/2018 and not 20/7/2018 as it says in the caption) is very similar to the sample one (top of pair in picture below).


I asked Dr Elliott who made the CCDSPEC what the horizontal lines in the spectra above were. His response was:

Hi Andrew

The slit is only 50 microns wide which is thinner than a human hair.

The horizontal lines are dust particles on the slit and don’t actually affect the spectrum as you normally add up all the horizontal rows to produce a 1 dimensional spectrum

It might be worth using an aerosol air cleaner but I wouldn’t touch the slit with anything

Pleased  you got a spectrum


Drawing of Comet C/2017 S3 in Camelopardalis by Nick Cox 20/7/2018

Really bright in Camelopardalis. Caught this at x50 at 1am.

Wonderfully bright and easy . Just put in you details here to get coordinates,


Solar Images in H alpha, Calcium K and Visible

Most of my solar images have been taken in visible or H alpha , the Baader CaK filter in conjunction with a Herschel wedge provides a relatively “cheap” way of imaging in CaK.

Images in Visible light give detail of the photosphere , which we can consider as the Suns “surface”, above this is the chromosphere, the upper part of which is viewed in H alpha and mid section can be viewed in Ca K wavelengths. (Not quite this simple as there is some overlap, but broadly works this way) The Cak is sensitive to magnetic fields and the stronger the magnetic filed the brighter the image, this gives more detail of the plages around sunspots and more detail of how magnetic field varies in these areas.

After some time setting up a system to image in all 3 wavelengths a fine clear day arrived on Friday 22nd June and I imaged the sunspots and prominences , then went away, which is why I’ve only just finished processing images.

All images were taken using a mono CCD camera : Imaging Source DMK41, the H alpha images were taken using a Coronado PST, the Visual White light images with a Herschel wedge with a ND.3 filter and Baader continuum filter on the camera, using a Skywatcher Evostar 120 refractor. The Cak images were taken with a Baader Cak filter attached to DMK41 and using a Herschel wedge with either a ND.3 or ND 0.6 filter on Skywatcher  ST102 ( for full disc) and / or Skywatcher Evostar 120. All Images were 600 frame avi’s stacked in AutoStakkert, wavelets tweaked in Registax 6 and final processing in Photoshop CS6. Not having imaged for a while I soon realised that I needed to do some cleaning before the next session as the “dust bunnies”  were more numerous than usual, luckily I was either able to manipulate image to avoid most of them or eliminate them in processing.

I have left the images as mono as features show up better for comparison rather than processing in false colour.

Whole disc in CaK and H alpha, no prominences visible in CaK.














Main surface features in Cak in Evostar 120, left to right : faculae, AR2715, AR2713


















Faculae in Halpha x2 barlow



AR2715 In Cak, Vis,  H alpha (x2 Barlow)









AR2713 in Cak, Vis , H alpha (x2 Barlow)









Prominences x2 Barlow






Moon and Venus 15/07/18

Now 2 days old the moon at 11% illumination presented it self in the evening sky at an elevation of approx. 12 degrees at 21:30, easily visible, unlike yesterday when I could only pick it out using binoculars.

Its companion this evening was Venus, easily visible unlike mercury of the previous evening. Didn’t have to travel any further than front lawn for these shots.