On Wed, 27 Apr 2005, ring_theory wrote:


wrote in message
...
In article 39,
bz wrote:

32 mm/sec = 115 meters per hour = 1,000,000 meters per year =
1,000 kilometers a year. How close does Tempel 1 get to Mars again?
How much do you think outgassing alters the comet's velocity?

The delta v event is a ONE TIME event, at the moment of collision.
Ring_theory erroniously assumes a continuing delta V.
You show that even if there were a continuning delta V, the effect would
be small.

The delta V was a one time event.

There will be a delta location that continues to grow, but that is NOT a
delta V. And it will be very small.

For that matter the out gassing from coming near the sun has a
much greater influence than this impact ever will. One grain of
sand does not make a beach.

Ellis, temple1 doesn't approach the sun. Mars and jupiter play catch with
it. But 1000 kilometers a year difference is going to put an end to it.

I *knew* you'd leap to the wrong conclusion, but I was hoping that
you would pleasantly surprise me...
Here's some history on Comet Tempel 1:

The comet was very well placed for its 1867 discovery thanks to its closest
approach to Earth (0.568 AU) and its perihelion (1.562 AU), which occurred
on May 15 and May 24, respectively. Over the next five months after its
initial detection, subsequent observations were frequently made. The comet
was last detected on August 27, 1867 by Julius Schmidt, at which point the
comet had become too faint for position measurements. At that time the comet
was 1.30 AU from Earth and 1.81 AU from the sun.

The comet was first recognized as periodic in May of 1867 when C. Bruhns of
Leipzig determined the orbital period to be 5.74 years. By the time the
final observations had been made of the 1867 apparition, the orbital period
had been re-calculated to be 5.68 years.

The comet was recovered on April 4, 1873 by E.J.M. Stephan of Marseilles,
France. The comet remained under observation until July 1st of that year.

Predictions were made for an 1879 return, with the most ambitious being that
of Raoul Gautier who computed definitive orbits from the two previous
appearances before making his predictions for the upcoming return. Gautier's
predictions enabled Tempel to recover the comet on April 25, 1879. The comet
was observed until its last detection on July 8.

In 1881, comet Tempel 1 passed 0.55 AU from Jupiter. Due to gravitational
interactions, the comet's orbital period was increased to 6.5 years and the
perihelion distance was increased from 1.8 AU to 2.1 AU, making the comet an
even fainter object. Subsequently, the comet was lost and it was not
observed at its next expected return. Photographic attempts during 1898 and
1905 failed to recover the comet.

During 1963, B.G. Marsden conducted an investigation as to why comet Tempel
1 became lost. He found that further close approaches to Jupiter in 1941
(0.41 AU) and 1953 (0.77 AU) had decreased both the perihelion distance and
the orbital period to values smaller than when the comet was initially
discovered. These approaches moved Tempel 1 into its present libration
around the 1:2 resonance with Jupiter. Subsequently, Marsden published
predictions for the 1967 and 1972 returns in his paper On the Orbits of Some
Long Lost Comets. (Courtesy of NASA Astrophysics Data System, from the
website http://deepimpact.jpl.nasa.gov/science/tempel1.html)

Jupiter has a much greater effect on its orbit than anything that
the Deep Impact impactor could possibly do. Will you finally accept this
fact?

Temple one isn't going to be a anomaly any more it's now back to space
debris for it. condemned by NASA.

Why do you keep referring to it as an "anomaly"?
Do you think that there will never ever be another comet in the same
situation as Tempel 1?

--
Jim Phillips, jay pee aitch eye el el eye pee at bee see pee ell dot net
"Moms and dads these days are like the Democratic party: lame, spineless
and not holding up their end of the equation. And kids are like the
Republicans: drunk with power and out of control." -- Bill Maher