how many satellites are there in jupiter in year 2007???

Answer 1

There doesn't seem to be any concrete data as to the number. Here are a couple of articles/links that speak to the topic.

http://solarsystem.nasa.gov/news/display.cfm?News_ID=17478

Turning now to the new year, 2007, our Jupiter encounter has just begun. In total, it'll span the six-month period from January through June. In future columns here, I'll provide many more details. I plan to write those at an increasing pace until we pass Jupiter at the very end of February.

For now, I'll just say that our mission and payload operations teams, working with our Jupiter Encounter Science Team (JEST), have been striving to plan and test over 100 Jupiter observing sequences comprising over 700 separate observations of Jupiter. The first of these occurred on January 5th, with a REX radio calibration using Jupiter. Over the next couple of weeks of January, PEPSSI and SWAP will continue to observe the interplanetary medium as we approach Jupiter, and Ralph and LORRI will begin imaging the giant planet. If you're following closely on our web site, you'll see us posting a New Horizons Jupiter image of the week every week beginning in mid-January.

I think this is all I want to say about our Jupiter encounter just now. But what I want to tell you about next is our big picture plan for 2007.

Most of the first half of the year is, as you might imagine, focused on the Jupiter encounter. But that isn't all we'll do. We also have two opportunities for course correction maneuvers-one in mid-February and one in mid-May. We'll almost certainly execute a trajectory trim burn in May, as our post-Jupiter encounter work settles down; that maneuver is currently estimated to cost us about 2 meters/second (5 miles per hour) in fuel. We could delay this maneuver to the fall, but it would cost more fuel then, because we'd be letting differences caused by our actual (non-perfect) Jupiter encounter, aim point build up longer. Whether we'll need the pre-encounter, February burn, or not, is something we'll be deciding in mid-January. I'll keep you posted. So far, it looks like we can skip that maneuver.

After our Jupiter encounter is complete, we'll also begin preparing for spacecraft hibernation, which will begin in July. I like to say that hibernation is the highway that will take us to Pluto. After all, we count on hibernation to both lower mission operations costs and to reduce the wear and tear on most spacecraft systems as we fly out to Pluto.

Before we go into hibernation, however, we need to downlink all of the Jupiter data we collect and complete the last ~10% or so of the instrument payload commissioning activities. Back in September, we put these tests off until the spring of 2007 in order to give our flight control team more time to concentrate on Jupiter encounter planning.

In April, we'll also conduct a test run of spacecraft hibernation. Although we did this in ground test, we want to gain some flight experience before the big plunge into long term hibernation this summer. And when we do begin hibernation operations, we'll be keeping a close eye on the spacecraft health with multiple weekly DSN passes for a few months, declining to weekly passes for another few months.

All in all, we won't settle into long term hibernation operations until mid-2008. And meanwhile, from late September through late November, we'll wake New Horizons up for the first of our annual, two-month spacecraft and instrument payload checkouts. During this time well also conduct some more cruise science observations, just as we'll do in subsequent annual wake up periods each year.

Also this spring, we'll test out some backup thrusters to alleviate the primary thruster overuse issue that I wrote about in my last update. And as well, we'll once again uplink another few updates to our onboard fault protection and correction software, which continually matures as we fly out spacecraft for month after month.

The, finally, fate in the year, from roughly December to 11 through 17, we'll experience our second solar conjunction period, limiting radio communications again.

Answer 2

jupitar now has 60 knowns satelites and one impeticular EUROPA is a possibilty for life