Watch NASA TV online -Deep Impact Schedule Expected Impact time: July 4, 1:52 am EST NASA launched Deep Impact space craft on Jan 12, 2005 to study Comet Tempel 1. Well the trick is as it approaches the comet on July 3rd, some where near Mars, the craft will separate into an impactor and a fly-by probe. The former will go head-on and hit the comet while the latter would grab some close-shot pictures. Links: NASA Mission – Wiki – Space.Com - Planetary Society
Mission Facts Science ObjectivesDeep Impact is part of the low-cost Discovery program of NASA missions. Its overarching goal is to increase our understanding of how the solar system formed by studying what a comet is made of. By digging into the interior of the comet, scientists hope to reach pristine material that reflects the composition of the solar system when the comet formed billions of years ago. The specific mission objectives are:
- Strike Tempel 1 with the impactor
- Observe how the crater forms
- Measure the crater’s depth and diameter
- Measure the composition of the interor of the crater and of the ejecta that is spewed out of the crater
- Determine how the outgassing from the comet changes after the impact
Deep Impact’s science will mostly be accomplished in a very short period of time, within the couple of days before and after the impact occurs.
- Launch: January 12, 2005
- Location: Kennedy Space Center
- Launch Vehicle: Delta II
- Impactor separation: 06:00 on July 3, 2005 UTC (11:00 pm on July 2, PST)
- Encounter: 05:50 on July 4, 2005 UTC (10:50 on July 3, PST)
- Impactor approach velocity: 10.2 kilometers per second (22,800 miles per hour)
- Flyby S/C closest approach: 500 km (310 miles)
- End of Mission: August 3, 2005
- Spacecraft mass:
- Total: 1020 kg
- Flyby Spacecraft: 515 kg
- Instruments: 90 kg
- Fuel: 86 kg
- Impactor: 364 kg (49% copper, 24% aluminum)
- Impactor fuel: 8 kg
- Spacecraft size:
- Body: approximately 3.2m (126″) long, 1.7m (68″) wide, and 2.3m (92″) high
- Impactor: 1m diameter
- Solar panels: about 2.8m square
- High gain antenna: 1m diameter
- Impact mechanics:
- Relative velocity between impactor and comet: 10.2 kilometers per second (22,800 miles per hour)
- Impact energy: 19 Gigajoules (equivalent to 4.5 tons of TNT, or to the amount of energy used by an average American household in one month)
- Period: 117 minutes
- Mission cost:
- Development and construction: $252 million
- Mission operations: $15 million
- Launch: $??? million





Today’s NBA Final was worth watching all along.