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nASA has added two years to the Cassini

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mission to Saturn where to go what to

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see to prepare for this extended journey

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engineers had to chart some tricky

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maneuvers trying to fulfill the wish

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lists of 200 scientists the spacecraft's

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going you have a locomotive speeding

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down the track they haven't built the

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railway yet and we're up front laying

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track it's a lot like if you're in

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triple-a and you go to the trip you go

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get a trip tik on the counter someone

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sits there with a map and draws out with

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a highlighter where you're going and

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plans out the trip with you so the

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scientists are on one side of the

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counter telling us what they want to see

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and then we're with the map mapping on a

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route and saying well how's this how's

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that for the last year and a half

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Cassini tour designers have been working

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at breakneck speed on plans for an

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extended mission it's not what you call

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a low stress job by Eddie beads they

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essentially lay down on the table what

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they want and as far as science goals

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and science objectives we come back we

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take that off for a couple months you

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know apply astrodynamics the people that

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want to look at the Rings want to be up

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high and look at the rains the other

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people want to be down in the same plane

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with the Rings where they can visit all

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the other moons and that's a huge

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tug-of-war so what the tour designers

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have to do is to take all of these

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different inputs from hundreds of

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scientists who say we have to observe

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this we want to look at that and put

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that together into a very compact new

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tour of two years has 17 solidus flybys

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added below 2,000 kilometers to at 25

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kilometers this tour has 26 Titan flybys

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it has two high northern ground tracks

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the tight last Titan flybys over here so

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this is where it reaches the ring plane

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so it kind of moves over a little bit we

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show a variety of different tours that

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are kind of in different flavors one

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makes the Rings people a little bit more

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happier than the moon's people okay

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goals for this PSG obviously for us we

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think it's select the final tour they

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raided the tours in terms of red

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unacceptable yellow acceptable and green

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acceptable but it sounds like 6 h 9 and

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eight should either both be

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both be read or both be yellow now all

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the candidates are out there and they've

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got a pic 16 h nine three greens align

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and red and in the end it was shades of

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green we will continue this in the

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executive session the science team

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leaders made the final decisions and the

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tour was called this you know kind of

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hard to pronounce pf6 h9 with that

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that's name of this hybrid tour

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Cassini's travel itinerary includes 60

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additional orbits of Saturn studies of

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the Rings the magnetosphere 26 flybys of

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Titan and close encounters with other

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exotic moons that's real gratifying that

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it was a hybrid tour that took kind of

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the best of a lot of different tours

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that we have been designing the Cassini

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mission to Saturn has revolutionized our

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knowledge of the ringed planet and the

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best maybe yet to come be able to fly

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through space in a complex place full of

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moons and rings and dust and so on and

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be able to navigate this space in such a

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way as to give Cassini a chance to make

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all the discoveries that the scientists

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on the mission would like to see happen

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I don't think of it as a wish list I

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think of it as a list of potential new

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discoveries that will be in the