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    $\begingroup$ There are no notes on ssd.jpl.nasa.gov/sb/sats.html But the Horizons record for 1866 Sisyphus has just been updated: Soln.date: 2024-Apr-13_06:20:31 ssd.jpl.nasa.gov/api/… $\endgroup$
    – PM 2Ring
    Commented Apr 13 at 14:52
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    $\begingroup$ found it on researchgate researchgate.net/publication/252604347_The_Curse_of_Sisyphus $\endgroup$
    – James K
    Commented Apr 14 at 13:20
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    $\begingroup$ Here are notes on the CW radar measurements in 1985 updated in 2013. echo.jpl.nasa.gov/asteroids/Sisyphus/sisyphus.html $\endgroup$
    – eshaya
    Commented Apr 15 at 13:38
  • $\begingroup$ @eshaya Wow, thanks! that definitely rises to the level of another answer post. It's the actual observed data from 1985 that we're talking about, plus (near the bottom) a nicely quotable explanation of it's re-interpretation. Also, posting it as an answer will allow me to ask the next question about the structure of the spectrum and it's interpretation. $\endgroup$
    – uhoh
    Commented Apr 15 at 22:00