Re: OR: Titan-sized luck for Titan shadow transit

Ha,, great OR. That was fun to read :-)

I've been using a 22" for two new-moons now and man your in for a steady
flow of great surprises! The coolest thing is that many of the brighter NGC
galaxies are showing structure of some kind. Many of my logs include
mentions of dark "C" shaped lanes, bracketing or thin wispy lanes around the
nucleus, bright clumps SSW of the blah-blah and so on. Worst part about
logging with a 22" is, your writing hand tiers quickly :-)

Congrats on receiving that beauty!

GML

-----Original Message-----
From: tac-bounces@No-Spam [mailto:tac-bounces@No-Spam]
On Behalf Of Greg Parker
Sent: Sunday, May 31, 2009 3:37 AM
To: tac@No-Spam
Subject: [TAC] OR: Titan-sized luck for Titan shadow transit

I had great views of Titan's shadow transit, but only after the good luck
defeated the bad.

Good luck: My 22" Starmaster arrived last week, two months earlier than I
had dared hope. It's a marvelous instrument; picking off galaxies in Virgo
is like taking candy from a baby compared to my venerable 8" Orion.

Bad luck: I didn't get home until after 10 pm, leaving little time for
collimation and cooling. Collimation is a rather big deal at f/3.3.

Good luck: "Home" is at 2400 feet, on Skyline Blvd not far from Oak Ridge
observatory. The fog obediently stayed in the valleys until after midnight.

Bad luck: The tracking drive's battery died after a few minutes.

Good luck: The second battery was inexplicably charged.

In the end I had over an hour of observing time across two hours. Seeing was
good enough, improving during the first hour as the optics cooled, then
deteriorating again as Saturn sank lower and the fog crept higher.

Titan's shadow was immediately apparent, and lost to bad seeing at 230x less
than 5% of the time. Over the course of two hours it moved from near the
"right" limb to somewhat past the center. It took me at least ten minutes to
remember this was not a transit but rather a shadow transit, and that the
bright yellowish Titan-like spot nearby was in fact Titan itself.

My sketch of the field includes two cloud bands, the rings' shadow cast on
Saturn, Saturn's shadow cast on the rings, and four moons in addition to
Titan. Tethys and Dione were "below" the "right" side of the rings; they too
moved noticeably with that as a reference, towards Saturn and in the same
direction as the shadow.

As the haze gathered around the Moon I trained my new telescope on it for
the first time. The unfiltered light from the eyepiece was like a flashlight
beam; teardown was delayed for several minutes as my vision recovered. Looks
like the old 8" is still good for something.

-- 
Greg Parker     gparker-tac@No-Spam
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