About Astrojohn

I am a science geek! Interests Astronomy, Skiing, Philosophy, basically any form of technology including writing automation software for my observatory. I will also share this with others using the same EQMOD/Astroart tool set.

Lecture to Chichester AS (South Downs) lots of questions.

The lecture on technical challenges of measurement in astronomy went well and loads of interesting questions. All started from the slow (15years) of looking for exoplanets round V470 Cam. Easily visible reduction in the errors over the time I have been making measurements. Some of the error reduction techniques I have used.


New Lecture on ‘Time’ went well.

Delivered to a great audience at the Farnborough Site (Cody AS). Mix of history, science, technical information and current research. Need to put it on Astrospeakers.org

New paper accepted by Royal Astronomical Society.

Now loaded on arXiv.org Cornell University Archive.

arXiv:2206.06919 [pdf, ps, other] astro-ph.SR astro-ph.EPEclipse timing variations in post-common envelope binaries: Are they a reliable indicator of circumbinary companions?Authors: D. Pulley, I. D. Sharp, J. Mallett, S. von HarrachAbstract: Post-common envelope binary systems evolve when matter is transferred from the primary star at a rate that […]

Just one of the many technical challenges to Astronomy.

Living just south of Gatwick Airport in a dark sky area still has some challenges.

Trails of aircraft that get bigger and form clouds. […]

Astroart 8.0 is released!

Astroart 8.0 is now available from the MSB-Astroart.com

Many improvements and better accuracy in some functions.

All major cameras, telescopes, filter wheels and focusers are supported by Astroart. Updated plugins are released for free.

Astroart is also an open system with plug-ins and development kit for C++, C#, Pascal, Visual Basic. Fully compatible […]

Starlink is a pain!!

I have missed another night of binary star measurement due to interference from Starlink.

Starlink costs researchers time and money!!

So much space pollution being caused deliberately by Elon Musk. My research could become more difficult as it will for anyone wanting to look beyond the earth. Over 11000 satellites to be launched…your joking, We only have a small percentage so far..

It wrecked my measurement of distant binary systems last night..



M51 very short exposure clear night

This is one of my favourite galaxies. Just did a quick exposure after doing some adjustments on my telescope.

Binary System HS0705+6700 Plot

Nice plot of the light curve for HS0705+6700, 2.3hr, post-common envelope eclipsing binary system. Spectroscopy and light curve analysis indicated that the secondary companion was a low mass red dwarf star with mass and radius of 0.13M0 and 0.19R0


Paper on objects round eclipsing binary stars.

The paper is now on the archive of scientific papers:


Quite a significant amount of new data from our group. Some interesting departures from early expectations. It will clearly take some ongoing research to identify the mechanisms that are producing some of the effects.

Seems to be getting some interest!