On the evening of October 5th, 2008, the Catalina Sky Survey's
1.5-m (60 inch) telescope on top of Mt. Lemmon discovered 2008 TC3. This
asteroid was the first one ever discovered before entering the Earth's
The dome is illuminated by thick crescent moon after sunset, making it
look like daylight shining on the dome. Watch for the change of color as the
moon sets, just like a sunset. As with any night, many aircraft and
satellites are visible. At the beginning, as the sky gets dark, you will see
a bright streak coming from behind the dome. It is quick, so you have to
watch carefully to see it. This streak was made by the International Space
Station before it disappears into the Earth's shadow.
As you watch the stars rotate over the dome, notice the one relatively
brighter star that doesn't seem to be moving. That is Polaris, or the North
Star. Just before sunrise, for a short time, the lens fogs over. Thus was
because of dropping temperatures and rapidly rising humidity.