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About Astrofriend

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    Star Forming

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    Astronomy, Cars, old stuff
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  1. Astrofriend

    Astroserver CPU load

    Maybe you have plans to build an astroserver to control your equipment. One thing to figure out is how fast computer do you need. Too fast and it take more power then necesary (my computer is battery operated), to slow and it will not work properly. I have made a table over the CPU loads on my Astroserver during different work: http://www.astrofriend.eu/astronomy/tutorials/tutorial-cpu-load/tutorial-cpu-load.html Maybe it could be to some help for you. /Lars
  2. Astrofriend

    Frustrating focuser problem

    Hi, Today I have solved a lot of problems. The problem with the wrong parking position of the focuser must have been caused by the fact that the focuser motor has too low torque now when I have increased the force on the focus axis. Not the temperature compensation which I first thought. Here you can see how I have temporarily solved it with help of a spring: http://www.astrofriend.eu/astronomy/projects/project-focus-friction/page06-project-focus-friction.html Maybe I will have a better solution to it later, but first I must test it out. /Lars
  3. Astrofriend

    Frustrating focuser problem

    Now with four clear skies in a row I could do a lot of test with the "sandpaper fix". It work better then ever, but found another problem, of course. Maybe the temperature compensation. Lars
  4. Astrofriend

    Frustrating focuser problem

    Sorry, I was not clear enough. I use this telescope only for astrophotographing. It already have motor focus. Camera and pheriphals weight about 1.5 kg. But same problem, focuser slip. Especially when doing automatic focus, then the motor move back and fort. If it slips then it will newer find the sweet spot focus. But I think I have solved the problem now. Just need a clear sky to do a test. Please give me that before the summer sets in! Lars
  5. Astrofriend

    Frustrating focuser problem

    Hi, Now I maybe have found a simple and quick fix of my slipping focuser. I have done a simple test if I can increase the friction with just sandpaper glued to the steelplate. It looks to work very well, maybe it will not last forever but then I just glue a new sandpaper on the steelplate. The sandpaper is a replacement for the diamond shape surface. I hope I can do outdoors test in the coming nights. Here is a bit more text and photos what I have done: http://www.astrofriend.eu/astronomy/projects/project-focus-friction/page05-project-focus-friction.html /Lars
  6. Astrofriend

    Astronomical Dictionary

    Hi TsRobot, Yes that astrograph is a gem. There are other instruments there too. One 40" Newton reflector, one twin refractor 20" and 24", one meridian instrument and a couple of smaller instrument. Top of the line in 1930s, Carl Zeiss. Do you have any old observatoies around? Lars
  7. Astrofriend

    DIY Observatory at Malta

    Hi Dave, I'm living at 60 degree latitude, and you? One more month and we almost have summer, but then no observations. Lars
  8. Astrofriend

    Astronomical Dictionary

    Hi Luke, Thanks for the comment. I try to use english on most of my pages, but not very skilled on it. But better now after a couple of years with my homepage when I'm forced to use english. Swedish is very limited when searching answers on internet. We are soon in the summerseason and then we can't do any observations. How about your place? Lars
  9. Astrofriend

    Frustrating focuser problem

    Hi, It's not so easy to change the axis surface. It needs to be of low friction surface because the press friction bearing acts on it at the same place as it press on the steelplate. I have thought about to instal two roller bearing on each side, but it's complicated. Lars
  10. Astrofriend

    Astronomical Dictionary

    Hi, Yes, I use it a lot myself, wikipedialinks with information that I link to is very usefull and of high quality. I have added many more astronomical words since last. Lars
  11. Astrofriend

    DIY Observatory at Malta

    I and my girlfriend has come home from a one week travel at Malta, a small island in the Medeterranien Sea. About a mount before we go I came in contact with an amateur astronomer down there, Maurice. He invited me and my girfriend to visit him and his DIY built observatory. The observatory is built on top of his house and it has a real dome. If you find it interesting to read about it I have done a small report from our visit at the Malta observatory with photos: http://www.astrofriend.eu/astronomy/observatory-sites/malta-maurice-observatory/malta-maurice-observatory.html The Raven and the Owl observatory, Malta. After this visit it's hard to understand why we stay in Sweden where we live, when it's dark it's also very cold. We often have from -20 degrees to 0 degrees Celcius temperatures. Now adays we don't have many clear nights either. /Lars
  12. Clouds and clouds and even more clouds, what is happening with our weather? Good then I have found a new part of the astronomy, scientific data. This is of course a bit outside amateur astronomy, but what to do when we never nowadays have a clear sky? This time I took a look at the Kepler spacecraft and it's data. Normally used to find exoplanets. But that data can also be used to examine variable stars. One big plus, the observatory is out in space, no clouds! One of the more exiting thing I did was to set together 44 months of data as a GIF movie. And by luck there was one very clearly seen variable star: http://www.astrofriend.eu/astronomy/science-data/science-data-kepler.html It was a bit tricky to get this to be correct because the satellite rotate 90 degrees every three months. To read these files I need two new tools which found at NASA homepage. The DS9 Fits reader and Fv reader. The other tools was the ones I normally use, AstroImageJ, Fitswork and IrfanView. In the beginning I also used a hex binary editor, but didn't need it in the end. /Lars
  13. Hi, Now I have finished the M1, M13, M31, M42 and M45. It's very interesting to study the details, remember these photos was taken when your grandfather was in action! /Lars
  14. Here is a project I have thought about over many years. What can I do with all scientific data that are out there? I tested this already 15 years ago with the POSS-I data from Mount Palomar observatory with good results. Now I'm just practising this how to handle the data and get something out of it. One easy task is just to make pictures from the data and compare it with my own photos. Just to get an idea how much worse my photos are compare to the telescopes at Mount Palomar. Here you can see how I have processed the first two Messier objects, M1 and M13: http://www.astrofriend.eu/astronomy/science-data/science-data.html Even more exiting is if I'm in the future can do some science with it. I have many cloudy nights so I'm desperate! /Lars
  15. Astrofriend

    Excel Astronomy calculations

    The last days has been productive, I have now transformed one more page of my Excel sheets, the Light Pollution calculator to a new Web Calculator page. I added a lot of new links with information, and also now tested that the calculation was correct, It at least look that now. You can read more here if you find it interesting: http://www.astrofriend.eu/astronomy/astronomy-calculations/skybackground-magnitude/sky-background-magnitude.html I now know that if I move from my balcony to a really dark place the sky background will be 5 magnitudes weaker or 1/100 of the flux. At the summer house I gain 3.6 magnitudes a typical night. /Lars

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