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    Pedro Braganca

    Hi,

    If anyone is interested, here's a discussion about how comet magnitudes are predicted, and why they're so hard. For the record, we also use the Meeus algorithm to do our calculation.

    Some quotable quotes from their discussion:

    "I've had a project going for a while to produce ephemerides listing the future brightnesses of comets. Some of the results end up on In-The-Sky.org (and perhaps even in the BAA Observing Calendar), but I tend to hide them away because they're mostly very bad."

    "For many years I used to try to do this for the annual Yearbook of Astronomy. It was a bit of a nightmare. The basic problem is that comets are a law unto themselves."

    "...predicting the magnitudes of comets is like nailing multiple jellies to the wall...."

     

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    Keiron Smith

    Please also note SkySafari downloads data from https://minorplanetcenter.net/

    Please contact them to make corrections.

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    Pedro Braganca

    I contacted the Minor Planet Center last night and Michael Rudenko will correct the error.  Try to update the MPC data by going to Settings-Solar System (scroll to bottom to see option) - should be available by tomorrow I hope.

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