[sci.space] TAU is useful

Dale.Amon@H.CS.CMU.EDU (11/18/86)

I think Gary Allen's point about Pluto might be a good one. It would be
interesting to have such a long distance probe give it a quick pass.
Shouldn't really matter that much, except for a bit of DV used for
getting a bit off the ecliptic.

However, I disagree that it is a boondoggle. There is a great deal to
be learned by getting a longer astrometric baseline. We hardly know
where things really are in our local neighborhood. I would also say
that we will need a lot more accurate position information on the
nearer stars if we are going to consider sending probes to them in the
next century. The current errors are probably FAR too large to do an
REAL orbit for even a star as close as Alpha Centauri. I've heard a
great deal of discussion about star probes, but no one has ever brought
up the difficulty of navigating to something whose x0,y0,z0 and
dx,dy,dz are so poorly known. Pointing a telescope is a bit different
from aiming a spacecraft for a close pass 40 or 50 years later. I would say
this mission is an important pre-requisite for such a flight.

Additionally, there are very interesting question to be answered about
the plasma/particle environment of intersteller space. There have been
recent suggestions that we are entering a small molecular cloud. It
would be extrememly interesting to see if this is true, and if so, to
learn more about the actual chemistry/composition/dynamics of such
clouds. It would be the collection of 'ground truth' for astronomers.
Corresponding to this there are questions about where the heliopause
actually is, and what it's structure is like.

If such a craft carries a radio antenna of any capacity, we would have
the resolution of a TAU-LBI radio telescope system available to study
and settle very basic questions about the central structure of the
driving engine of quasars, Seyfert galaxies, peculiar galaxies, etc.
Not to mention highly detailed pictures of our own galaxy core.

I would also love to see a photograph that shows the solar system as a
single entity. This would be possible if the mission did indeed have
photographic equipment for Pluto was consequently was off ecliptic and
still had enough power to take pictures when it got that far out. I
realize it wouldn't necessarily show more than a number of bright dots,
but let your imagination take hold of it. It's the closest any of us
even has a shot at getting to the childhood dream's of starflight.
Dreams do count.