Aug - Sep 99
Watching
For A Lunar Impact
By Don Davis
The night that
Lunar Prospector was to impact the Moon I took out my 10 inch Dobsonian, cleaned the filmy
and dusty mirrors, then took the telescope outside an hour before the impact and returned
to a temperature acclimated telescope just before the scheduled event.
The seeing was fairly good for the area, a bit of rippling air
texture overlaid the crisp shadow detail along the southern edge of the otherwise
brilliant nearly full Moon. The dazzling starburst 'ray pattern around Tycho crater
is the most prominent full moon landmark, and its streaky 'rays' were draped across the
irregular southern terrain. A few isolated tall mountains stood out over the edge of the
disk, or the 'limb' and a few shadowed crater rims nearly skirting the edge gave striking
illusions of tall precipices across the region the Prospector was destined to plunge. The
time came and went, I studied this region which sported much flickering fine detail and
textures, and saw nothing. I scanned along the dark skies with the Moon just out of frame
and saw no expanding envelope of debris nor any angled dust spray. I really didn't expect
to, but it was nice to look at the Moon and know something was happening there for the
first time in over a quarter century.
It brought back just a bit of the old thrill of the Glory days of Apollo to know the
hand of man was at work on this nearby world. After the event was over I swung the
telescope towards two rising planets, first bright Jupiter rising above the trees. Its
flattened bright disk was escorted by the four large satellites, and the globe was white
in the equatorial zone, ivory across the rest of the disk, and two prominent tan-brown
belts with irregular edges separating the two major color zones. More fainter belts swam
in and out of visibility in the higher latitudes.
Next I glanced at Saturn and was delighted to see the bright rings nearly widened
enough to cover the poles of the planet. Saturns shadow is especially prominent now,
and the ringed planet is looking strikingly three dimensional. I can't wait to see the
Hubble photos being taken around this time and as the rings widen.
Although spacecraft close-ups of the planets and moons may be harder to come by in the
future, at least the various great observatories are gathering images from distant space
which will provide inspiration to us all on a continuing basis.

Copyright © 1999
International Association of Astronomical Artists |