Astronomers know nothing about the universe, except for a few large bodies with regular orbits. Any idiot should have understood the latest April 14,
2004, as comet Bradfield (diameter : 10,000 km) popped out of nowhere to become the largest body ever recorded in the inner solar system.
Transcript from
edition.cnn.com...
HOW - 1. "actually you will not be able to see it ... "
Spotting Toutatis
Toutatis will not be visible to the unaided eye. Experienced telescope users can see it now from the Southern Hemisphere, and in early October it will
be visible from the north.
Finding Toutatis will be challenging, Harris said, due to a combination of the asteroid's position in the sky and interfering moonlight.
Because the asteroid is so close, its location in the sky will vary significantly for skywatchers in different places on Earth at any given moment.
And because it moves quickly, the location changes constantly. Printed sky maps don't always provide enough detail to be useful.
"In a large telescope the motion would be perceptible against any stars in the field more or less in real time, sort of like watching the second hand
on a clock," Harris said, adding that the movement would be "not quite that fast, but noticeable."
Highly experienced observers will use complex plotting information known as ephemeris data. Others can use software programs that generate maps for
specific times and locations.
At its closest on September 29, Toutatis will be visible only to observers in the Southern Hemisphere.
Large and steady binoculars will be able to pick out the pinprick of sunlight reflecting off the asteroid, providing observers "use a good program
like Starry Night Pro to plot its incredibly rapid motion across the sky," said Clay Sherrod of the Arkansas Sky Observatory. (The software company
Starry Night is owned by Imaginova, parent also of SPACE.com.)
Soon thereafter, experienced backyard astronomers north of the equator will have a chance to find Toutatis.
"By early October, it will suddenly be re-emerging into northern skies as its apparent trajectory will bring it back into very favorable view,"
Sherrod said in an e-mail interview. But by then the asteroid will be moving away from Earth and getting dimmer. It will quickly become "very
difficult" to spot even with an 8-inch telescope, he said.
HOW - 2. "... but we already saw it "
Sherrod photographed the giant space rock last week (it was visible then in the north through large telescopes) and said exposures longer than eight
seconds showed a trail as the giant rock moved slightly against the background of stars.
"It has been quite a wonderful show so far," he said.
HOW / WHY - "we know all about what's going on around us - even the weirdest, smallest body"
Asteroid Toutatis was discovered in 1989. Scientists have modeled its strange rotation and odd shape -- it looks something like a pockmarked dumbbell
-- on previous flybys.
Instead of a fixed north pole, Toutatis' axis of rotation wanders in two separate cycles of 5.4 and 7.3 Earth-days. So while most asteroids rotate
somewhat like a football thrown in a perfect spiral, "Toutatis tumbles like a flubbed pass," says Scott Hudson of Washington State University.
Astronomers will use this week's flyby to examine Toutatis in greater detail, with a goal of pinning down the rock's rate of spin and better
estimating its future path.
WHY - "relax, nothing is going to happen here, at least in your life time"
While some rumors have suggested the asteroid's forecasted course might be off by enough to cause a collision with Earth, Sherrod agrees with Harris
and other scientists that there is no chance for calamity. Sherrod has been monitoring Toutatis' movement since July 3, logging more than 500
observations that allow mapping of a precise trajectory.
"Although the actual path of it has indeed varied a slight bit from the original calculated, there is absolutely no chance of a physical encounter or
impact with Earth," he said.