Anonymous ID: 981a84 Nov. 23, 2020, 5:47 a.m. No.11749863   ๐Ÿ—„๏ธ.is ๐Ÿ”—kun   >>9877

>>11749837

Xenon was discovered by Sir William Ramsay, a Scottish chemist, and Morris M. Travers, an English chemist, on July 12, 1898, shortly after their discovery of the elements krypton and neon. Like krypton and neon, xenon was discovered through the study of liquefied air. The earth's atmosphere is about 0.0000087% xenon.

 

Xenon produces a brilliant white flash of light when it is excited electrically and is widely used in strobe lights. The light emitted from xenon lamps is also used to kill bacteria and to power ruby lasers.

 

Due to its high atomic weight, xenon ions were used as a fuel in an experimental ion engine aboard the space probe Deep Space 1.

 

DEEP SPACE 1

 

It also carries the Plasma Experiment for Planetary Exploration (PEPE), an ion and electron spectrometer which measures the solar wind during cruise, the interaction of the solar wind with target bodies during encounters, and the composition of the cometary coma.

 

PEPE

 

soโ€ฆDonald Trump's Tycoon gameโ€ฆlayers within layers and double Pepes

Anonymous ID: 981a84 Nov. 23, 2020, 5:52 a.m. No.11749877   ๐Ÿ—„๏ธ.is ๐Ÿ”—kun

>>11749863

The primary mission lasted until 18 September 1999, the spacecraft is now in an extended mission. By the end of 1999 approximately 22 kg of xenon had been used by the ion engine to impart a total delta V of 1300 m/s to the spacecraft. The original plan was to fly by the dormant comet Wilson-Harrington in January 2001 and comet Borrelly in September 2001. The star tracker failed on 11 November 1999 and a new extended mission to fly by comet Borrely (using techniques developed to operate the spacecraft without the star tracker) was planned. On 22 September 2001, Deep Space 1 entered the coma of comet Borrelly and made its closest approach (2171 km) to the nucleus at 22:29:33 UT ( 6:29:33 p.m. EDT). It was travelling at 16.58 km/s relative to the nucleus. At the time of the flyby the spacecraft and comet were 1.36 AU from the Sun. The PEPE instrument was turned on throughout the encounter. MICAS started making measurements and imaging 80 minutes before encounter and operated until a few minutes before encounter as planned. Both instruments successfully returned data and images from the encounter. The ion engines on DS1 were commanded off on 18 December 2001 at about 20:00 UT (3:00 p.m. EST) to end the mission. The radio reciever was left on in case future contact with the spacecraft is desired. All new technologies on board DS1 were successfully tested during the primary mission.

 

Deep Space 1 has a total mission cost of $152.3 million comprised of $94.8 million for development, $43.5 million for launch, $10.3 million for operations, and $3.7 million for science.