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bunyon
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When two predictions conflict
      #6167428 - 10/30/13 10:14 PM

Cal Sky predicts a ISS transit across the moon for Nov. 7 for me. The centerline passes within a mile of my house.

However, Sky Safari has ISS missing the moon by half a degree.

Which, if either, should I trust?


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GlennLeDrew
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Re: When two predictions conflict new [Re: bunyon]
      #6167696 - 10/31/13 02:09 AM

Which is using the more recent orbital elements?

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bunyon
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Re: When two predictions conflict new [Re: GlennLeDrew]
      #6167910 - 10/31/13 08:24 AM

How would I determine that?

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GlennLeDrew
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Re: When two predictions conflict new [Re: bunyon]
      #6171487 - 11/02/13 06:57 AM

If you can peruse the data file containing the satellite orbital elements, there may be a header stating the epoch date. I'm just guessing here, as I've never downloaded such data for any of my planetarium software. If you've never updated these elements for your software, predictions will become significantly in error in a matter of weeks. The safe thing is to update those elements reasonably frequently. After doing this, let us know if the different software predictions have become more congruent...

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bunyon
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Re: When two predictions conflict new [Re: GlennLeDrew]
      #6172010 - 11/02/13 01:49 PM

It looks like CalSky is more recent. We'll see.

Or not...supposed to rain the day of the transit.

Thanks.


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