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Welcome to the Observatory!

This site is intended for anyone interested in astronomy, and particularly anyone who would like to be a member of the Bootham School Astronomy Society. This membership is available to all members of the Bootham community, and students from other York schools who have attended the ISSP course on astronomy at Bootham. If you choose to subscribe by email, you will receive an email of any new post within about twenty four hours. There will also be twitter updates before an observatory session, and you are recommended to follow me on twitter using the button on the right of this screen.

Saturday, 4 February 2012

A good night was had by all!

It was very good to see so many people at the observing session last night - thankyou very much for coming! Just to recap on some of the things we looked at;

File:Orion IAU.svg

First, we said goodnight to Venus as our sister world sank into the western haze over the school library. Binoculars give a hint that Venus has phases, like the moon, but a good telescope really helps.

Then we used binoculars to see Betelgeuse - a giant red star that forms the top shoulder of Orion. Then we tracked downwards and eastwards to view Sirius and Procyon, his faithful hunting dogs.

On the other side of Orion's belt, pointing upwards and westwards lies the red star Aldebaran, surrounded by an aging open cluster known as the Hyades. Further onwards and westwards we come to the magnificent Pleiades - also known as the seven sisters. These are fairly young stars, all formed in the same cocoon of dust and gas about 100 million years ago. You could think of the Pleiades as a sort of primary school for stars, while the Hyades are more like a secondary school.

We then hooked back to Orion, and found the glorious Great Orion Nebula under the belt - it is sometimes described as Orion's sword. This is an enormous cloud of dust and gas left over from the birth of the galaxy. At some point, shock waves from a nearby supernova explosion triggered the formation of thousands of stars in the cloud, so it can be thought of as a nursery for stars.

So there you have it - stellar birth to stellar old age in just a few hops around Orion. If we'd been able to see the Crab Nebula in Taurus (not far from Aldebaran either), we'd have also seen what happens to stars after they die.

After this, as clouds gathered above we had a look at Jupiter, catching a nice view with two moons on either side, and the two major cloud belts showing nicely.


Once viewing had finished, it was great fun showing off the transit instrument, and explaining (probably very badly) how the "lines of longitude" on the sky (right ascension), can be used as a clock to create a measure known as sidereal time. The apparent movement of the sky is something absolutely central to really getting inside stargazing. Once you have a feel for what to expect, in what direction and when (and this is not that hard to do), it makes a real difference to your confidence in finding your way around. I very highly recommend taking the time to get familiar with ideas on the topic of the celestial sphere.
Finally, we spoke briefly about binoculars. May I recommend that you think about getting yourself a well-made pair of something like 8x50? These are quite easily bought second-hand for very little, and they make a world of difference to anyone starting out on learning about the night sky. I've added a link to the firm Telescope House. They supplied our new telescope, and have always been very helpful whenever I have been in touch - if you feel like buying new, they are worth calling for some honest advice about matching budget with performance.

Monday, 30 January 2012

Don't forget this Friday!

If the skies are clear, I'll open up the observatory at 8pm this Friday evening. Drop me a line if you feel like coming, but keep an eye on this website, just in case the weather doesn't deliver the viewing we need.

Monday, 23 January 2012

Coronal Mass ejection (CME) on the way

At about 2pm on tuesday afternoon the biggest solar storm to hit the Earth since 2005 will arrive. It is possible that we may get a showing of the Northern Lights on Tuesday night, so check in with this page to see what the aurorawatch status is. If you see red, go outside at once and look for aurorae!!!



this picture was taken by Bjørn Jørgensen from Tromsø, Norway on the night of the 22nd.

Friday, 20 January 2012

Sorry folks, we need to cancel.

It is now pouring with rain, and I don't think there is any possibility of the weather improving in the next few hours, so with great regret I am cancelling tonight's observing session. Next Friday, the school will be closed for leave weekend, so the next good opportunity will be on Friday 3rd Feb, at 8.00pm. This clashes with a chamber choir concert, so please continue to support that event if you were planning to go - there will be other observatory sessions during the term.

Oh dear - the weather looks terrible

As I peer from my office window, the clouds seem to be gathering ever more thickly, and the thin band of clear sky that had held sway in the north-east all morning has finally vanished. I'll make a final call on tonight's observing evening at 5.00pm this evening, so that you get a chance to see a note in the school's reception area, as well as posting here.