Deep Space 1 Asteroid Flyby

Planet-Crossing Asteroid Survey. At the time it was discovered, asteroid Braille appeared as a … target of an extended mission, comet Borrelly, is one of the …

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Deep Space 1 Asteroid Flyby NATIONAL AERONAUTICS AND SPACE ADMINISTRATION Deep Space 1 Asteroid Flyby Press Kit July 1999 Contacts Douglas Isbell Policy/Program Management 202/358-1753 Headquarters, Washington, DC Franklin O?Donnell Deep Space 1 Mission 818/354-5011 Jet Propulsion Laboratory, Pasadena, CA John G. Watson Deep Space 1 Mission 818/354-0474 Jet Propulsion Laboratory, Pasadena, CA Contents General Release ??……………..?…?? 3 Media Services Information ……………..??????………?. 5 Quick Facts ??????………………….?.. 6 The New Millennium Program ?????…………….?????…..???. 7 Mission Overview ?????……………..???……??? 9 Science Objectives ????………………?????….?.. 16 The 12 Technologies ???……………..????…?.?? 19 Spacecraft ?………………??..??.?? 31 What’s Next ……………….??…???.? 33 Program/Project Management ……………….???..?.?? 35 1 2 RELEASE: DEEP SPACE 1 SET TO FLY BY ASTEROID 9969 BRAILLE With its technology testing objectives almost fully accomplished, NASA’s Deep Space 1 mission is about to undergo its most comprehensive challenge: the exotic spacecraft is set to fly within 15 kilometers (10 miles) of the newly named asteroid 9969 Braille on July 29 (July 28 Pacific Daylight Time), the closest encounter with an asteroid ever attempted. Deep Space 1 will rely on its experimental autonomous navigation system, or AutoNav, to guide the spacecraft past the mysterious, little-known space rock at 04:46 a.m. Universal Time July 29 (9:46 p.m. July 28 Pacific Daylight Time) at a relative speed of nearly 56,000 kilometers per hour (35,000 miles per hour). “Testing advanced technologies for the benefit of future missions is the purpose of Deep Space 1, so we view the flyby and its science return as a bonus,” said Dr. Marc Rayman, Deep Space 1’s chief mission engineer and deputy mission manager. “This ambitious encounter is a high-risk endeavor whose success is by no means guaranteed. But should there be significant data return, the findings will be of great interest to the science community.” Asteroid Braille was previously known by its temporary designation of 1992 KD. The new name was announced today by the Planetary Society, Pasadena, CA, as the result of a nam- ing contest focused on inventor themes which drew more than 500 entries from around the world. The winning entry was submitted by Kerry Babcock of Port Orange, FL. Eleanor Helin, who co-discovered the asteroid with fellow astronomer Kenneth Lawrence, made the final deci- sion on the name. Helin and Lawrence are astronomers at NASA’s Jet Propulsion Laboratory, Pasadena, CA, which also manages Deep Space 1. During the encounter, Deep Space 1 will be in the ecliptic plane (the plane in which Earth and most other planets orbit the Sun), moving more slowly than the asteroid, which will be progressing up through the ecliptic plane from below. Thus it may well be more apt to say that the asteroid will zoom by Deep Space 1 than the reverse. The flyby will allow final testing of AutoNav, which enables the spacecraft to use images of distant stars and asteroids within our solar system to keep track of its location in space and to guide trajectory changes it needs to remain on course. Deep Space 1 has success- fully completed testing of its 11 other new technologies. The asteroid and the space environment surrounding it make scientifically interesting targets for two advanced, highly integrated science instruments aboard Deep Space 1. During the flyby, an integrated spectrometer and imaging instrument is scheduled to send back black- and-white photographs as well as images taken in infrared light, while a second instrument that 3 studies the three-dimensional distribution of ions and electrons, or plasma, will conduct several investigations. In addition to their value for engineering future space missions, images and other data returned from this encounter will greatly assist scientists in their understanding of the funda- mental properties of asteroids. Although scientists believe its diameter is approximately 1 to 5 kilometers (0.6 to 3 miles), they know little else about the object. With this flyby, they can learn more about its shape, size, surface composition, mineralogy and terrain. Launched on October 24, 1998, from Cape Canaveral Air Station, FL, Deep Space 1 is the first mission under NASA’s New Millennium Program, which tests new technologies for future space and Earth-observing missions. The technologies that have been tested on Deep Space 1 will help make future science spacecraft smaller, less expensive, more autonomous and capable of more independent decision-making so that they rely less on tracking and intervention by ground controllers. The mission has exceeded almost all of its technology testing requirements by conduct- ing more extensive tests than had been planned. As one dramatic example, the spacecraft’s experimental xenon ion engine, which was required to thrust for a minimum of 200 hours, has been operated for more than 1,800 hours to date. Deep Space 1 is budgeted at $152 million, including design, development, launch and operations. The mission is managed for NASA’s Office of Space Science by the Jet Propulsion Laboratory, Pasadena, CA. JPL is a division of the California Institute of Technology. [End of General Release] 4 Media Services Information NASA Television Transmission NASA Television is broadcast on the satellite GE-2, transponder 9C, C band, 85 degrees west longitude, frequency 3880.0 MHz, vertical polarization, audio monaural at 6.8 MHz. A schedule of programming is available on the Internet at . Status Reports Status reports on mission activities for Deep Space 1 are issued by the Jet Propulsion Laboratory’s Media Relations Office as events dictate. They may be accessed online as noted below. Audio status reports from the Deep Space 1 project are available by calling (800) 391- 6654 or (818) 354-2410. Briefing An overview of results from the asteroid flyby will be presented in a news briefing broadcast on NASA Television originating from NASA?s Jet Propulsion Laboratory, Pasadena, CA, on August 3, 1999, at 10 a.m. PDT. Internet Information Extensive information on Deep Space 1, including an electronic copy of this press kit, press releases, fact sheets, status reports and images, is available at . The Deep Space 1 mission also maintains a home page at . 5 Quick Facts Spacecraft Dimensions: Core bus 1.1 meters deep

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