If you have a computerised observatory, you might know about dome slaving, the process of keeping the shutter on the dome right in front of the telescope. Not only is there a lot of mathematics in this, but also it’s a complicated task to set up the different components of your system. This is the first article in a series on different ways to do this.

FOR SALE: QHY600M-Pro Condition: external marking but internally refurbished by QHY. No accessories included. Price $7000 (new price is around $14,000) Contact: Diego on Facebook at https://www.facebook.com/dcolonnello Details This is a full-frame monochrome cooled camera, equipped with a Sony IMX455 back-illuminated sensor. The sensor is 9576×6388 pixels (61mp), each 3.76µm in size, giving an overall dimension…

PegasusAstro focus, power and dew heater controllers use a range of temperature and environmental sensors. Knowing which one goes with what product can be confusing. Bill’s written a handy list for you.

Every month, I present a talk at the Astronomical Society of Victoria on what’s up in the sky. They’re uploaded to YouTube and a few other video sites, and I talk about what visual observers can see at this time of year, what astrophotographers can image, as well as other things. One of the regular…

Taking monochrome images of a galaxy in red, green and blue light allows you to make a full colour image, in a similar way to your eyes detecting the three colours and your brain combining them in the colour image. But you add exposures taken through a Hydrogen alpha filter, which draws out emission nebulas in the galaxy.

For the Lunar Eclipse of September 2025, Bill used a remote facility that Sidereal Trading had installed at a club in Victoria to get a sequence of images. It didn’t go quite to plan, but he got the shots anyway.