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Corpze

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Posts posted by Corpze

  3. Park position changes?

    in Software

    Posted

    Hi, I do not if this is an issue or me not handeling my start up rutine correct.

    I have defined my Park position "1" close to homefind to quickly calibrate the encoders, but after a power toggle, the DEC axis wont move, i have to move it manually with the pad in Autoslew, is this because I shut the power down to the mount?

    When i have calibrated the mount and slews it from CdC it works just fine, and the stars are dead center with 2350mm FL, so it is not the pointing accuracy, I re-enter Park position "1" and now it slews just fine to that position, but when i power it up next day, same error :/

    Maybe i have forgotten to save the .ini file in Autoslew?

     

    /Daniel

  6. Astrometry.net instead of pinpoint?

    in Software

    Posted

    Daniel,

     

    you can set up astrometry.net in local, but Sequencer won't use it right now. By the way, it is - in my experience - usually slower than Pinpoint as long as the FOV is halfway there. If your pointing is completely off, Astrometry works better....

    You say "right now" - is there something on its way?

    Well, i havent used Ponpoint so i cant compare the speed, but is it worth the money?

  9. Can autoslew correct for atmospheric refraction?

    in Software

    Posted

    the influence of temperature dependency for refraction correction is minor and neglegible compared to other errror sources like hysteresis etc.

    Also, the temperature gradient in the atmosphere is something that cannot be measured anyway, even if you measure the temperature at the altitude you are observing, you can have a temperature inversion above etc.

    So there is no real sense in doing this.

    I have been doing a bit of reading, first of all, I have mixed up atmospheric refraction and distortion, so please discard post no.3 :-)

     

    I have been reading this paper regarding atmospheric refraction; http://astro.ukho.gov.uk/data/tn/naotn63.pdf

     

    In witch you find this table;

    image.jpg

     

    If I understand this right, a increase of 10hPa increases the refraction by 23 arcseconds.

    Also, a increase of 2.5K in temperature brings the refraction down by 34 arcseconds.

     

    One thing i am uncertain of is if these numbers add on top of the "standard refraction" of 5 arc minutes at the horizon and 2 arc minutes at 30 degrees elevation.

     

    In my mind, this is huge numbers, please fill in my knowledge gaps of how these numbers are neglegible.

     

    Regards, Daniel Sundström

  16. How to mount three scopes the best way?

    in ASA DDM85, 100, 200, 500

    Posted

    I have looked at ADM dovetails and they seems like good products, my main concern is how the radial inbalance will effect the pointing but mainly the tracking of the DDM mount, these are very picky when balancing.

    Do you have to drill your own holes in the connection plate to fasten in to the ASA saddle?

    The scopes are a C9,25" and a Meade 102mm APO and a Lunt LS60 solar scope.

    I am thinking of mounting the Lunt on top of the APO in one Losmandy saddle and the Cassegrain in another Losmandy dovetail.

    Or is it better to mount them on a tripple saddle?

    Regards/ Daniel

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