The Scruffy Astronomer

29 March 2019 I was talking with a mate the other day about these Facebook posts, when I casually mentioned the one I'd done about the expanding Crab Nebula.  Duh, turns out I'd never posted it! So here it is. https://apod.nasa.gov/apod/ap180104.html   The Crab Nebula (M1) was formed by a supernova in 1054, so a little under 1000 years ago. People saw it from the Earth. Supernovas are big bangs. The gas and dust ejected from the exploding star formed a massive nebula with criss-crossing shock waves further interacting with clouds of hydrogen, oxygen and other gases and elements. It's a very complex nebula - a little like the Tarantula. But the real point is that it's still expanding. So fast, in fact, that you can actually see it growing in a time-lapse taken by Detlef Hartmann over a ten-year period . I would definitely recommend having a look at the Crab Nebula - it won't move while you're watching it, of course, even though it is expanding at about 1000 km pe...

27 March 2019 Meteorite on the Moon January 2019 Australian sky watchers didn't get to the see the latest total lunar eclipse, as it was all done from start to end while the Moon was around the wrong side of the Earth. Pity, it was called a "Super Blood Wolf Moon", which sounds cool. While I know what all the other words mean, the "wolf" escapes me.  Something a marketing team dreamt up perhaps? However, there was something a bit unusual about the event. Soon after it began, a meteor struck the Moon in its darkened side. This caused a good sized flash that lasted for several seconds (some report up to 8) after the impact.  Image: https://apod.nasa.gov/apod/ap190125.html Things hitting the Moon isn't unusual, it's just that during an eclipse the flash the impacts make is that much more obvious. Further, when so many people were watching, it's only to be expected that it the event would be caught on film (or whatever you say these days). What might be ...

We've added a new video to the Optics Central YouTube channel - two in fact, as it comes in two parts. In the first part , Bill unboxes a new Celestron CPC925. This is a large Schmidt-Cassegrain telescope on a computerised go-to mount.  He goes through the features of the scope, discusses what it's useful for as well as how it fits in with other scopes in the Celestron range. Then he unboxes it, going through what you get in the box. Finally in this part, he assembles the scope, describes its various features and tries to come to terms with the size of this monster. In the second part , Bill shows how the mount works with the Celestron NexStar hand controller, including doing a one-star alignment. He also describes a few optional accessories for the scope. (I hasten to point out that I'm a telescope geek and not an actor!)

22 March 2019 Welcome to the Autumn Equinox! For the stargazers among us, I've prepared a list of things to look at at this time of year - better when the Moon goes away, of course. Some are suited to larger scopes, but clusters work well in small ones. I've ordered it by the time each object reaches its highest point, so it'd be best to start at the top of the list, as these will be starting to set (some don't set at all, remember). For example, the picture is my dodgy effort at M83, which rises at 20:18 and sets at 09:45 tomorrow, reaching the meridian at about 3am. Good hunting! Galaxy: Large Magellanic Cloud (06:49 PM) Globular cluster: M 79 - (06:50 PM) Bright nebula: M 1 - Crab Nebula (07:00 PM) Bright nebula: M 43 - De Mairan's Nebula (07:01 PM) Diffuse Nebula: M 42 - Orion Nebula (07:01 PM) Bright nebula: NGC 1977 - Running Man Nebula (07:01 PM) Bright nebula: NGC 2070 - Tarantula Nebula (07:04 PM) Dark nebula: B 33 - Horsehead Nebula (07:06 PM) Diffuse nebu...

20 March 2019 The other day I got involved in a discussion on the Birding-Aus Facebook page about binoculars. You probably know (and if you don't you could easily guess) that among birdwatchers, discussions about binoculars are numerous and enthusiastic. It's a bit like how car people can talk all day about how Ferrari is better than Lamborghini, but most people drive Toyotas or Kias. In the case of binoculars, the big three are Leica, Zeiss and Swarovski. But most birdos start off with something a little more affordable like Bushnell, Pentax, Steiner or Saxon. Here are two of my pairs - my current Nikon Morarch 8.5x56 and an ancient East German Zeiss Jena 8x30. The Zeiss are old, but totally bulletproof. I think they were made so that if NATO ever invaded Eastern Europe they could be used in desperation as tank traps or bludgeons. ...and they're Zeiss. My first was a pair of Vixen Ultima 8x56, which were brilliant in low light, but eventually fell to pieces. I could watch ...

18 March 2019 You might have noticed that telescopes, particularly small refractors, have multiple uses and configurations.  Mostly, of course, they're used as standalone telescopes. Normally they are used with a diagonals, but sometimes you don't want a diagonal in there. For example, you're trying to look at something near the horizon, or actually on ground. Or you're photographing through the refractor, including using it as a guide scope for autoguiding. This is where the challenge begins. Sometimes, if you take the diagonal off a telescope, and put the eyepiece directly in its place, or if you swap the eyepiece for a camera, you won't be able to get it to focus. In these cases, you'll need a spacer, which is a ring that simply adds distance between the focuser and the eyepiece. These two photos show instances when I've needed spacers. The first is for my main refractor, which wasn't shipped with a diagonal at all. In order to figure out how much spa...

15 March 2019 This is my last "you can do it" post about the 127mm saxon FCD100. I've been trying to show what YOU should reasonably expect to get from basic equipment without really complicated technical know-how.  This post is a bit different, as I've used some post-processing in the form of two free programs called Autostakkert and Registax.  I'm a nebula guy with a wide angle telescope, so I've never taken a really good shot of a planet in my life. ( I've published a couple here . They're not much.) So when I say I'm showing what a beginner might expect - I'm not kidding! This is what I did. I took my NEQ6 mount up to the dark sky site and set it up on a pier. I mounted the scope and attached the Orion Starshoot 5MP and cabled it to my laptop. I also used TWO inexpensive 2xBarlow lenses to try to get more magnification. The saxon 127 is only 952mm in focal length, so I was working at about 3800mm effective focal length. I polar aligned usin...