Cometary Fireworks Go Off Without Hitch

PingXao writes "The JPL Deep Impact mission has successfully slammed a sattelite into Tempel 1 at 23,000 mph. (37,000 kph). The autonomous navigation system was primed for up to 3 course corrections in the final 2 hours of flight but only had to execute two of them. The second was so small - expending less than a pound of propellant - that impact would have occurred without it. Initially thought to be shaped like a pickle, it came to resemble more of a banana shape as comet Tempel I drew closer. Impact was estimated to have released 19 Gigajoules of energy, or the equivalent of 4.5 tons of TNT."

Comments

Seems a Lot Smoother Than I Would Have Thought

[DanielMarkham]

With all that outgassing, you would think a comet's surface would be a lot more sharp -- full of crevasses and ridges (like it was on Deep Impact) But this one seemed almost smooth, like an asteroid. I wonder if this will change the theory of how comets are constructed?

Ugliest Dog I Ever Saw

Re: Result

[Black Parrot]

> This is quite likely the finest result Nasa has had for a long time.

Ignoring a couple of rovers on Mars...

Re: Result

[Bhalash]

And a lil ol' probe named Cassini

Next Time

[jmichaelg]

It was a very impressive achievement. We need to do a lot more of these missions so we have an adequate sample of what comets look like because, scoff if you will, eventually earth will be endangered by one. If we have a sample of several comets we can make reasonable plans as to how to deflect them. Right now we have a sample of one.

Next time would be better if:

• There's enough fuel on the mother ship to drop the impactor and then get out of harm's way to turn around to match speeds with the comet. The mother ship can linger over the crater for years watching the newly formed crater evolve.
• The mother could land another drop ship in the newly excavated crater to give us a closeup of the comet's interior.
• Deploy several microprobes that have little seismometers on them. As the comet outgasses, the seimic waves will give us information as to how the comet's interior is structured. Each seismometer could be powered with a small atomic battery which would enable it to operate for years and provide ample power to broadcast the seismometer's readings to the mother ship.
• Make sure the equipment functions properly before it's launched. Blurry hi res photos because someone forgot to calibrate the equipment or parachutes that fail to open over Utah because they're installed backwards aren't ok.