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Posted by baalke on February 15, 2007, 4:32 pm
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http://pluto.jhuapl.edu/overview/piPerspectives/piPerspective_current.php
The PI's Perspective: Calm Before Close Approach
Alan Stern
February 15, 2007
If you look at our "Where Is New Horizons?
<http://pluto.jhuapl.edu/mission/whereis_nh.php>" page, which displays
the spacecraft's trajectory status, you'll see we're right on
Jupiter's
doorstep. And it's true. Jupiter already appears one-third of a degree
across ? just a little smaller than the full Moon as seen from Earth ?
and growing every day. By early next week, Jupiter will be almost
two-thirds of a degree across. And by closest approach, just over 2
weeks from now, Jupiter will loom 3.6? across ? about the size of a
golf
ball held at arm's length. That may not sound like much, but it beats
the size of anything we have or will pass on the way to Pluto, except
Earth itself in the first 2 hours of the flight. (FYI: We passed the
Moon at a range of about 184,000 kilometers [114,000 miles], making
its
maximum size some 9 hours after launch just a tad under 1.1? across.)
Well, enough trivia. What's on tap for New Horizons? This is the third
week in our lull before the ramp up to closest approach begins
February
24. To illustrate this lull compared with the approaching storm, we
currently are performing two or three observation sequences per day,
most of which measure charged particles and the solar wind with the
PEPSSI and SWAP instruments. Between February 24 and March 4, however,
we'll conduct 10 to 20 observation sequences per day, with all six
encounter instruments participating. So, over the next week on the
approach to Jupiter, our bread-and-butter observations will be of
energetic particles and the solar wind, with only a single Alice
ultraviolet spectrometer calibration (using Europa) to spice up the
schedule.
Of course, that doesn't mean we aren't busy. We're planning a full
science-team meeting for closest approach; and we're completing the
review process of the closest-approach command loads after running
them
on NHOPS ? our spacecraft simulator. We're also putting in place our
entire March through June operations plan, which will include
observations of Jupiter's magnetotail, a trajectory course correction,
a
practice run at spacecraft hibernation, and various other spacecraft
and
instrument tests to complete the final bits of commissioning before we
enter hibernation this summer. I'll be back with more news next week.
- Alan Stern
During the Jupiter encounter, you'll also be able to read Alan Stern's
blog on Astronomy magazine; check out http://www.astronomy.com
<http://www.astronomy.com/> for details.
Postscript: I am in awe of the Jupiter encounter we are so smoothly
executing half a billion miles away. A great many people didn't think
we
could pull off an exciting encounter with hundreds upon hundreds of
observations, but now we are in the thick of it. And it's due to the
team's hard work, dedication, and virtuoso performances.
And just think, today is the last day we could possibly have launched
to
Pluto on the Atlas 5. It would have been good to fly even at this late
date, but it would have been a 13-plus-year slog with no Jupiter
encounter along the way.
We've come so far from those days when New Horizons was only a design,
and then only under construction, or in thermal vacuum testing, or
down
at the Cape awaiting an RTG and a launch vehicle that could be
certified
to fly. Now, the curtain rises on our close approach to Planet 5: Zeus
awaits our arrival in less than two weeks. It's really happening.
Enjoy
the ride!
- A.S.
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