According to Jean Meeus Centry occurances 1600-1699 39 1700-1799 25 1800-1899 19 1900-1999 19 2000-2099 25 2100-2199 21 2200-2299 30 According to Kelly Beaty concerning last year's event http://www.skyandtelescope.com/community/skyblog/observingblog/19005984.html DT --- On Sun, 7/12/09, Kim <kimharch@cut.net> wrote:

From: Kim <kimharch@cut.net> Subject: Re: [Utah-astronomy] Jupiter and No Visible Galilean Moons Coming in September To: "'Utah Astronomy'" <utah-astronomy@mailman.xmission.com> Date: Sunday, July 12, 2009, 3:51 PM Does anyone happen to know how often the Gallilean sattelites are unobservable from Earth as they will be on September 2-3? In other words, how rare is this phenomenon?

Thanks, Kim

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-----Original Message----- From: utah-astronomy-bounces@mailman.xmission.com [mailto:utah-astronomy- bounces@mailman.xmission.com] On Behalf Of erikhansen@TheBlueZone.net Sent: Sunday, July 12, 2009 8:17 AM To: Utah Astronomy Subject: Re: [Utah-astronomy] Jupiter and No Visible Galilean Moons Coming in September

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It's the end of the world as we know it.......... and I feel fine

  Boy!  Saturn with no rings, the Sun with no spots and now Jupiter's

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satellites are going away.

Just who's running this solar system anyway?!?

:)

On 11 Jul 2009, at 07:34, Jay Eads wrote:

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Jim's post on viewing Jupiter and my own experience on Thursday night of watching Europa emerge from behind Jupiter reminded me that on the night of September 2nd and 3rd, of this year the Galilean moons will not be visible for around 2 hours.  This last occurred on May 21st, 2008.  According to this article from MSNBC:

"If you miss out seeing Jupiter without satellites, you can at least be consoled in knowing that there will be another, much better chance less than 16 months from now, on the night of September 2-3, 2009. That event will take place in the middle of the night for North America, with Jupiter appearing well up in the southern sky. And best of all, the four moons will be out of sight for almost two hours."

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