How To Use a Computerised Telescope Book Review

How to Use a Computerised Telescope introduces topics which are common to all computerised telescopes, but the book mainly covers the Meade ETX, LX200 and Celestron Nexstar ranges.

How to Use a Computerised Telescope begins by telling you about how the sky moves and how computerised telescopes track the stars in altazimuth and equatorial modes. It also includes details about the on-board GPS on the telescope and how to steady telescope mounts, wedges, and permanent mounts and how to best align a telescope. There is also a good section on factors that can affect pointing accuracy.
 
There is a whole chapter given over equatorial mounts and wedges and how to align the telescope using both methods.

The 5th chapter covers telescope optics and the different kinds of telescope as well as a useful section on how to collimate an SCT or Newtonian telescope.

Chapter 6 covers everything about eyepieces, including the different types such as Plossl, Radian, Kellner, Nagler and more. There is also information on power formulas and details on Barlow lenses, focal reducers, filters, sun filters and finders.

Chapter 7 is all about astrophotography and it tells you about the equipment you can purchase and how to attach your camera to the telescope either by piggybacking, prime focus, afocal and positive projection. There is also information on CCD cameras, webcams, and how to perform effective focusing.
 
Chapter 8 is all about troubleshooting, and it lists lots of problems you may come across and possible solutions for them.

The final three chapters are then given over to information about three main telescopes, these are the Meade LX200, Celestron Nexstar 5 and 8 and finally the Meade ETX and LX90 ranges.

These chapters carry a lot of information about each telescope such as about the menu options available on each handset and what the commands actually do.  There are also some wiring diagram on how to make serial and USB cables for the LX200 and Nexstar telescopes.
 
At around 225 pages there is a lot of information in this book, especially applicable if you have a Meade LX200, ETX or Celestron Nexstar telescope.  I learnt a lot about how to use my LX200 from this book and How to Use a Computerised Telescope is also a great book to have and read if you did not like or understand the manufacturers manual that accompanied your telescope.

How to use a computerised telescope is available at Waterstones

Astronaut Loses Tool Bag on Space Station

A spacewalking astronaut accidentally let go of her tool bag after a grease gun inside it exploded, and helplessly watched as it floated away with everything inside.

It was one of the largest items ever to be lost by a spacewalker, and occurred during an unprecedented attempt to clean and lube a gummed-up joint on a solar panel.

Heidemarie Stefanyshyn-Piper was just starting to work on the joint when the mishap occurred.

She said her grease gun exploded, getting the dark grey stuff all over a camera and her gloves. While wiping off herself, the white, backpack-size bag slipped out of her grip, and she lost all her other tools.

“Oh, great,” she mumbled.

Ms Stefanyshyn-Piper and her fellow spacewalker, Stephen Bowen, then went on to finish their tasks in six hours and 52 minutes by sharing tools.

Mr Bowen had his own tool bag with another grease gun, putty knife and oven-like terry cloth mitts to wipe away metal grit from a clogged joint at the space station.

“Despite my little hiccup, or major hiccup, I think we did a good job out there,” Ms Stefanyshyn-Piper said after returning to the space station.

Flight controllers were assessing the impact the lost bag would have on the next three planned spacewalks.

Earlier, the spacewalkers spotted a screw floating by, but were too far away to catch it. “I have no idea where it came from,” Ms Stefanyshyn-Piper told Mission Control.

So, look out for a NASA toolbag landing in your backgarden soon! No, not really I think it will burn up in the atmosphere or actually stay in orbit forever!

Telescope Portable Battery

If you ever want to use your GoTo telescope on location then you’ll need a 12v power source.

Maplin have their Portable Jump Start and Air Compressor on offer until the end of December 2008 for just £19.99 – perfect for powering your telescope.

The perfect gift for the astronomer in your family, plus it will always do lots of other jobs around the house such as pump up tyres or jump start your car battery as well.

The original price was £44.99, so now you can save £25! Order your Battery here now!

Maplin Telescope Battery Specifications:

• Up to 400A cranking power
• 12V power supply output – ideal for spotlights, car vacuums, portable fridges etc
• 200psi compressor for inflating car and cycle tyres, inflatable toys etc.
• Unit houses a sealed 17Ah battery with meter to show battery charge
• Built-in light for emergencies
• Complete with heavy duty jump leads, mains power supply and car cigarette lead

Sky at Night Magazine Subscription

Get someone you love, preferably an astronomer, a subscription to Sky at Night magazine. The magazine comes with a CD packed full of interactive goodies every month as well as a magazine which includes astronomy news, how to’s, in-depth articles and my favourite – astronomy adverts!

The cheapest place to buy a subscription online is with Magazine Group, who currently have the subscription for:

6 months Sky at Night Magazine : £17.80

12 months Sky at Night Magazine : £35.75

That works out to be about £3 a magazine including delivery, instead of the shop price of £4.25

AstroBlast Day 2008

On Sunday I travelled to Bedford for my first ever Astroblast. I got to Bedford School just in time to attend Nik Szymanek’s workshop talk on the basics of CCD imaging. I have attended a couple of Nik’s talks and at last this time he went a little further into how he gets his results, by covering his setup and how CCDs work as well as information on dark frames, flat fields etc.

I would like to hear from Nik all day long about his methods, and he does actually do some 1 day workshops now and again, so I think I shall book one of these once they are on at a venue near me.

I then walked down to the main exhibition hall which contained all of the exhibitors including Green Witch, Astronomy Now and many others. I also saw a recon pair of stormtroopers from the 501st garrison who were keeping guard and directing people around.

In the afternoon I sat in on a talk by Lee Sproats from Green Witch who gave a talk entitled “Telescopes of the Future” in which Lee spoke about the present and future research telescopes.

Lee began by talking about the history of telescopes and about adaptive optics, as well as active optics and how large mirrors are actually built and transported.

Here is a list of the telescopes that Lee talked about and some of the specifications of the telescopes:

Large Binocular Telescope

• 2 x 8.4m F/1 mirrors
• 11.8m aperture
• 600 ton weight
• 3x resolution of the Hubble Telescope due to adaptive optics

Large Synoptic Survey Telescope

• 3,200 Mp Camera
• Paul Baker optical design
• 1GB/sec download speed

Giant Magellan Telescope

• 7 x 8.4m mirrors
• 7 secondary mirrors
• Same resolving power as a 24.5m mirror

EELT

• 96 x 1.45m Segments (42m mirror)
• 5,500 tons in weight
• 6m secondary mirror

JWST (James Webb Telescope)

• 12ft long
• 39ft wide
• 6.5m mirror

NASA DLR

• A 2.5m telescope on a 747 plane which can handle flying times of 8 hours

LAMA

• 18 x 10m mirrors
• Mercury mirrors

TMT

• 30m mirror F/1
• 2m secondary mirror

OWL

• 100m mirror
• 130m high

It was good to see lots of activities for the children especially the rocket bulding, and I can’t wait to take my son in a few years so he can build rockets and do modelling etc.

Now I have mentioned rockets, I attended a talk by the Great British Rocketry Team, who gave an interesting talk on the different types of competition classes of rocketeering there are as well as talking about their trip to the Baikonur Cosmodrome, which holds a lot of history pieces in the space museum. They also told us that Gagarin actually had to parachute out of his capsule when re-entering the earth’s atmosphere at about 60,000 feet. He also mentioned that Russia actually had their own Space Shuttle which looks almost identical to the US version, but the Russian’s did not think much of the design, and they only flew the shuttle twice and it was never manned.

As I was leaving the Astroblast the children all gathered on the front lawn and launched their rockets which they had made during the day, they were launched two at a time with help from an air compressor, some went quite high, and you had to keep your eye on them, so you did not have one land on your head!

I have fancied getting into some rocketry, but I think I will start with some simple stomp rockets and bicarbonate rocket kits first.

Overall, a great day of free talks and exhibitors, I look forward to attending next year’s Astroblast 2009.

Green Laser Pointer Review

I attended my first Star Party the other week and both the hosts of the party used green laser pointers to point out which celestial objects we were actually looking at through the telescopes and on the large projection screen.

The green laser pointers were amazing and the beam of light went all the way through the sky to the object, which made it look like the beam was actually touching the stars!

So I decided to get myself a green laser pointer, I chose a Revelation Green Laser Pointer from Telescope Planet, it arrived quickly and came in a presentation metal box and it included 2x AAA batteries as well as instructions.

The laser pointer has a 5 mW output and has a beam range of over 12,000 ft. The unit is of very high quality and a great present for any astronomer, especially at the price of around £30.

The laser pointer can also be used in conjunction with a universal bracket which can be fitted to most telescopes which allows the laser pointer to be used as a very capable finderscope.

You can buy the green laser pointer from Telescope Planet here.

Buy Astronaut Food Here

Looking for an unusal gift for someone? How about Astronaut Food? You can get Strawberries and Neopolitan Ice Cream.

Now you can eat the same food Nasa Astronauts eat on space missions. The foil sachets contain freeze dried strawberries or ice cream which last almost indefinitely, making them suitable for long space flights.

As they are eaten, saliva in the mouth re-hydrates the ultra-light chunks, returning them to their original state. Just Pop a Strawberry one in your mouth and it swells up magically to a full size fully flavoured succulent fruit. Brilliant for parties, perhaps Star Parties!

Each Astronaut Food packet is £2.99, you can buy the Strawberries Astronaut Food here and buy the Neopolitan Ice Cream Astronaut Food here.

“Colouring the Night Sky” Talk by Alan Aylward

Tonight’s talk at the Cambridge Astronomy Assocation was by Alan Aylward who was telling us everything we needed to know about aurorae.

Aurora can actually be seen from space, and some images demonstrated this, with views from the NASA shuttle. Aurora were actually treated with fear in historical times.

Early research showed that aurorae actually extended around the poles of the Earth in a ring ~(as shown in the accompanying image), and the ring (more commonly called the “aurora oval”) does actually move, so depending on where it is, you may see an aurora.

Aurora’s have actually been visible from the UK, and we were told that in the UK we may have the chance to see aurora up to three times a year, but cloudy nights decrease our chances of viewing one.

The Earth’s aurorae are actually triggered by the Sun, as the solar winds interaction with the magnetosphere is mapped down into our atmosphere. We were also informed that there are different colours to the aurorae. A red aurora means that the aurora is very high in the atmosphere, whilst the middle height colour is green and a low aurora provides a purple colour in the sky.

We were told that Coronal Mass Ejections (CME’s) create the Earth’s aurorae activity, but other planets also have aurorae including Jupiter which creates its own aurorae with a lot of help from the volcanic moon Io. Saturn also have aurorae as well, but they are 100x less active than Jupiter’s.

Overall we learnt, that anything with magnetic fields has aurorae. This was a great talk that told us everything we wanted to know about aurorae, and even more besides.

Impact Day 2008

On Sunday I visited the Cambridge Astronomy Association for the Impact Day 2008, which was a free day of lectures about comets and meteorites.

As well as a full day of lectures there were also a number of stalls selling astronomy books, astronomy hardware and of course a number of meteorites. I was amazed to see the actual number of meteorites that you could purchase, which included rock from the Moon and from Mars.

There were lots of activities for children, including making model craters and the children also received their own iron meteorite for a small fee.

I attended three of the five talks during the day. The first one was by Dr Caroline Smith who was from the Natural History Museum in London, and she looks after nearly 2,000 meteorites in the national collection. We were told that there are over 35,000 meteorites found so far, and that 34,000 of these have come from the Antarctic. The desert of the Antarctic is a great place to find meteorites as they stand out so well in the snow and the dry conditions enhance the preservation of the meteorites, as in a normal country within 20,000 years a meteorite can breakdown and disappear.

We were also told that meteorites can give us the age of the solar system and details on the evolution of the solar system.

It was interesting to find out that stony meteorites are broken down into two groups; achondrites and chondrites. Achondrites have undergone melting whilst Chondrites have not. It was also mentioned that Calcium Aluminium Rich Inclusions (CAI) allow you to date the meteorite.

I also attended a talk entitled “Do you come here often? Dirty snowballs: Comets” by Jonathan Shanklin and a talk by Nik Szymanek, which unfortunately I had seen before, but it was worth sitting through it again, I can’t get bored of seeing Nik’s astrophotography images.

Overall it was a great day, and even better it was all free.

Philips SPC1300 Webcam for Astronomy?

I noticed today that Philips have released a new range of webcams, and there are a couple of Pro models. The main one to look at is the SPC1300 or SPC1330 as it’s called on the Philips web site. The SPC1300 is said to be a 2 Megapixel webcam, unlike the SPC900 which is a 1.3 Megapixel camera.

The major downside of the new SPC1300 is that the sensor is a CMOS sensor where as the SPC900 is a CCD sensor. But will this make a lot of difference when undertaking astrophotography?

Is the SPC1300 the new SPC900? Can the SPC1300 be taken apart and the lens removed and a standard plastic lens adaptor be screwed in? I suppose the only way to find out is to purchase one and try and take it apart.

The cheapest place to buy from seems to be Amazon or Pixmania for around £50.

The weight of the webcam is only 110g and the fixed lens is f/2.8

If anybody has more information on this, or has one and has adapted it, I would love to know about it, so please leave some comments about it.