| |
 |
|
|
Science Forum Index » Astro Forum » New Horizons: One Year Down, Eight to Go, on the Road to Plu
Page 1 of 1
|
| Author |
Message |
| Guest |
 Posted: Tue Jan 23, 2007 9:02 pm |
|
|
|
|
http://pluto.jhuapl.edu/overview/piPerspectives/piPerspective_current.php
The PI's Perspective
One Year Down, Eight to Go, on the Road to Pluto
Alan Stern
January 23, 2007
A year ago this past Friday, on January 19, 2006, New Horizons lifted
off on a pillar of smoke and fire and began its journey to Pluto and
the
Kuiper Belt. How quickly that year has passed. New Horizons and our
ground team accomplished a great deal in that first year of flight,
including:
* A complete checkout of the spacecraft and its redundant
subsystems.
* Three small trajectory correction maneuvers that precisely
steered
our little craft toward its Pluto aim point, some 2 million
kilometers off Jupiter's limb.
* A complete checkout and initial calibrations of all seven
on-board
scientific instruments.
* The design, testing and installation of new guidance and
navigation, fault protection/autonomy, and command and data
handling software packages that repair bugs found in flight and
enable a variety of new capabilities.
* Tests of target-tracking capabilities during a serendipitous,
target of opportunity flyby of the small asteroid 2002 JF56, now
officially named "APL" by the International Astronomical Union.
* Initial planning for the first hibernation phase on the cruise
from Jupiter to Pluto.
* Preparation of more than 700 separate Jupiter science
observations
scheduled for January-June 2007.
* The start of Jupiter approach observations on January 6, 2007.
In learning to fly our "bird," we've also come to work the kinks out of
our ground systems, our ground-based spacecraft simulator, our
flight-control processes and our data-reduction and observation
planning
tools. These many activities summarize the busy year we've had, but
they
hardly capture the intense workload for the small science and
operations
teams that together operate New Horizons.
Now, as we think about the one year behind us and the almost 8 1/2
years
to go to reach our first frontier destination ? the Pluto system ?
we're
humbled by the task ahead: We must be good stewards of New Horizons as
it flies another 2.5 billion miles, or more than 4 billion kilometers!
The iconic cartoon image of Lucy pulling the football away from Charlie
Brown (in Charles Shultz's "Peanuts" comic strip) is a constant
reminder
to us all on New Horizons that, despite what the spacecraft and team
have accomplished, we are not yet even close to achieving our goal. The
lesson here is clear: We have a lot to be proud of but we can never let
our guard down, for the goods we aim to bring home are still far beyond
our present position, and almost a decade still hence.
But enough on that. We have a Jupiter encounter under way and it's
already exciting.
New Horizons Kids
Before I turn to the beginnings of our Jupiter encounter, I want to
cover a topic I promised I would in my last PI Perspective on January 5
<piPerspective_1_5_2007.php>. It's called "New Horizons Kids." The idea
came to me when I saw a marvelous image (from Florida Today) of two
boys
watching our launch last year.
That image gave me the idea that we could follow the development of
some
children growing up during our 9 1/2-year journey from Earth to Pluto.
So, today, I am announcing a new part of our Education and Public
Outreach program called New Horizons Kids, or NHKs.
We're looking for four to six boys and girls born on January 19, 2006,
and another four to six kids who turned 10 that day. We'll follow those
10 or 12 kids as they grow to be 10 and 20 years old, respectively,
while our dream machine New Horizons soars across the solar system.
From
time to time, we'll check in on our kids, and by the time the newborns
from launch reach 4th grade and the 10-year-olds from launch reach the
middle of college, we'll be at Pluto.
So, if you or a relative or a friend has a child who was born on either
January 19, 2006, or January 19, 1996, please send the child's name,
birth date, a recent picture and the names and e-mail address(es) of
their parents to plutokids@jhuapl.edu <mailto:plutokids@jhuapl.edu>.
We'll collect nominations until we pass Jupiter, and then we'll
announce
the roster of children we'll be following for another 8-plus years as
New Horizons Kids.
Jupiter, Here We Come!
Now let me turn to my final topic for this time: We are now in full
swing doing Jupiter approach observations. Already, our SWAP and PEPSSI
instruments are measuring the particle environment upstream of Jupiter,
looking for the first signs of the giant planet's magnetospheric
influence, which we hope to detect early next month. At the same time,
our LORRI and Ralph imagers are already training themselves on Jupiter,
assessing its meteorological state and using its satellites for both
optical navigation practice and calibration targets. So too, our REX
radio science package has begun testing using the Jupiter system as a
calibration source, and our Alice ultraviolet spectrometer will begin
an
intensive set of observations of Jovian aurora and the Io plasma torus
in just over a month.
[Image]
The first preliminary cylindrical projection map of Jupiter's
meteorology made by New Horizons, obtained by our LORRI high-resolution
telescope-imager in early January 2007.
Exciting results are already revealing themselves. Early LORRI imagery
of Jupiter has revealed the planet's atmospheric state to be unlike
what
Cassini or Galileo saw, and much more reminiscent of the 1979 Voyager 1
flyby. In fact, just last week, Jupiter expert Dr. Kevin Baines of the
Jet Propulsion Laboratory, one of our mission science team
collaborators, wrote on seeing the first LORRI approach images: "It
seems clear that Jupiter is showing us a different face than we've seen
on previous encounters. Jupiter's equatorial and southern tropical
latitudes seem remarkably quiescent, all the way down to the Great Red
Spot (GRS). It seems the skies are clear over a much larger fraction of
the planet than has been typically encountered by these other
spacecraft
.. . .so it seems we may not get the typical ammonia-cloud storms
forming
in the GRS turbulent region. However, Jupiter is known for dramatic
spurts of activity, and we can keep our fingers crossed that something
a
bit more exciting might happen before late February . . . But if
Jupiter
remains relatively quiet, this might give us a valuable opportunity to
effectively plumb the obscure depths of Jupiter below the ammonia
clouds. In particular, these clear skies mean we can look deep over
nearly the entire turbulent region northwest of the GRS. With the
spectral mapping capability of LEISA, this could give us the first
near-IR spectral identification of deep water clouds there, if the
skies
are clear of the ammonia hydrosulfide cloud as well."
Another of our key Jupiter experts, mission science team collaborator
Dr. Amy Simon of NASA's Goddard Space Flight Center, was also impressed
with our first images of the giant planet, and wrote: "I'm struck by
how
similar the equatorial region appears, compared with a Voyager 1 map.
Away from there, the GRS is still rounder today, and currently shows
less convective activity in the region to its west. We also don't see
brown barges in the north, but we haven't seen those since Voyager,
anyway. The 'Little Red Spot' is still red, but that region may be
showing some other activity."
This is so cool! We set out for Pluto-Charon and the Kuiper Belt
thinking of Jupiter as little more than a gravity assist target and a
testing ground in preparation for the real meat and potatoes that lies
ahead in the second half of the 2010s. Yet, even our first Jupiter
system observations are revealing new things about the solar system's
largest planet. And those first images were taken more than 35 times
farther than we will be at closest approach. So hold on to your hats,
sports fans, it's going to get better and better over the next six
weeks. Jupiter, here we come!
Well, that's all I have time to write just now. I'll be back with
another update soon, as Jupiter nears. In the meantime, keep on
exploring - just like we do.
-Alan Stern |
|
|
| Back to top |
|
| |
|
Page 1 of 1
All times are GMT - 5 Hours
The time now is Fri Jul 25, 2008 2:33 am
|
|
