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Glasspusher

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About Glasspusher

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    Proto Star

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    https://sites.google.com/site/grubbparsons/
  1. Many thanks for the replies. I have fiddled around with various versions of Stellarium and Stellariumscope, checking on the recommendations on the website of the latter, all to no avail. I decided to give cartes du ciel a go (thanks solarboy) and got it up and running immediately. Not used in anger yet but initial thoughts are that it is certainly an improvement on the Stellarium/Stellariumscope option. John
  2. Yes Julian, ran Stellarium scope and established a connection with eqmod, the handset opens on the screen. John
  3. Hello, Previously I have had no problems using Stellarium and eqmod with my EQ6. I decided to install a newer version of Stellarium and now I can't connect to the telescope using the telescope control plug in. Not at all sure what is happening. Could someone kindly remind me of the correct steps to take when using the telescope control plug in? Any help gratefully received, many thanks in anticipation. John
  4. Saganite, Thanks for your input, you can find more about the UKIRT here: https://sites.google.com/site/grubbparsons/home/grubb-parsons/telescopes-made-by-grubb-parsons/150-in-mirror-ukirt-hawaii-1976 UKIRT was a very successful telescope, unfortunately UK funding was terminated some years ago and the telescope was taken over by the University of Hawaii I believe. The telescope was closed down a while ago, together with two others on Mauna Kea, possibly in an attempt to appease the protesters objecting to the construction of the Thirty Meter Telescope. Mauna Kea is considered to be a sacred place by native Hawaiians. John
  5. The 29th August marks the anniversary of the passing of David Sinden former chief optician at Grubb Parsons, Newcastle. Although not large by today's standards David worked on many telescopes which at the time represented the cutting edge of telescope technology. These included the Anglo Australian Telescope (now renamed the Australian Astronomical Telescope), The Isaac Newton Telescope and the United Kingdom Infra-red Telescope (UKIRT). After leaving Grubb Parsons David went on to establish his own very successful business, the Sinden Optical company. Despite his pedigree David used to refer to himself as an amateur and always gave feely of his time and knowledge. Meeting David was an unforgettable experience such was the nature of the man. The attached image shows David (wearing a waistcoat) with the 72 inch mirror for the Helwan Telescope Egypt. To find out more about David and Grubb Parsons please have a look at my website: https://sites.google.com/site/grubbparsons/home Thanks for looking. John
  6. Hello, I am looking for a pitch at the Kelling star party including the main weekend. If you can't make it and would like to sell your pitch please contact me. Thanks, John
  7. Hi Rick, Good to see that you have resumed work on the mirror. Looking at your video I see that you are using a 13 inch lap, if you are parabolising the mirror I would recommend something around 10 inch in diameter. A 13 inch lap will be slow at adding correction. I usually use a 50 % (or even smaller) diameter lap for figuring which seems to work well. Also a 'w' stroke like the one you are using tends to be slower at adding correction than a stroke across the mirror with a slight offset so that the centre of the lap is not passing through the centre of the mirror. Good luck, will be watching your progress with interest. John
  8. That is true Damian. It always takes me back to my first visit to David Sinden's workshop......or was it my first visit to the local Indian restaurant? Either way great memories. John
  9. I have a copy of ATM Book 1 first edition from 1928, it is in very poor condition. It was given to me by an ex-employee of Grubb Parsons who told me that it was consulted regularly during the making of some of the companies large telescopes, it certainly bares the scares of heavy usage. I have to say that I love the smell of molten pitch!!!! Keep up the good work with the mirror Chris. John
  10. Congratulations on your first spectrum....glad you decided to have ago! Be careful you might get hooked. John
  11. Yes, this type of spectroscopy is well suited to our changeable weather. The SA has been used to record the spectra of comets together with brighter supernova, being a slitless spectrograph it is not suited to extended objects although small planetary nebula are doable. John
  12. Hi tooth_dr, I used a single two second exposure to produce the above spectrum. You might need to stack several images for fainter stars, this can be done with registax or similar. Hope you manage to try your SA out, as I said, great fun. John
  13. Hello, For low resolution spectroscopy with the star analyser 100 a star with strong Hydrogen Balmer lines is very useful for calibration purposes. Vega is often recommended for this purpose, but is a little low in the evening at this time of year. A useful alternative is Theta Gem which also shows strong Hydrogen Balmer lines. Below is an image showing its spectrum taken with a 10 inch Newtonian at F6.4 and a SXH-9 CCD camera. If any one is thinking trying low resolution spectroscopy with the SA 100 give it a go, I have been having lots of fun with one.
  14. Hi Robin, Thanks for your comments and the link. I am just experimenting with the SA 100 at the moment and really enjoying it! From what I am reading it looks like I should continue to work with the SA 100 without the prism! I have found your comments here and other forums very helpful, thanks again. John
  15. Hi, Just wondering if anybody has used the Patton Hawksley 3.8 degree prism in conjunction with a star analyser diffraction grating? If so, would like to hear your thoughts as to whether or not it is a worthwhile investment. Thanks, John
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