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    Архив RU.SPACE.NEWS за 21 июля 1998


    Дата: 21 июля 1998 (1998-07-21) От: Alexander Bondugin Тема: Today On Galileo - July 19, 1998 Привет всем! Вот, свалилось из Internet... TODAY ON GALILEO July 19, 1998 The fifth encounter of the Galileo Europa Mission starts late today, seven months after the start of the spacecraft's mission extension. The encounter features the sixth consecutive flyby of Jupiter's moon Europa. The first in the series was the last encounter of Galileo's primary mission. During the next 3-1/2 days, Galileo will concentrate on Europa, but will also make observations of a white oval and hot spots in Jupiter's atmosphere. The encounter will also include selected observations of Io and Ganymede. During the encounter, the spacecraft finds itself at distance of 656 million kilometers (408 million miles) from Earth. At that distance, it will take radio signals approximately 36-1/2 minutes to travel to and from the spacecraft. The main computer on board Galileo will start executing the encounter command sequence at 9:55 pm PDT [See Note 1 below]. By coincidence, at that same time, the spacecraft will be passing Jupiter's volcanic moon Io at a distance of just under 701,000 kilometers (436,000 miles). This is the spacecraft's closest approach to Io for this orbit. The start of the encounter is also the start of the fields and particles instruments' survey of Jupiter's dust, plasma, magnetic and electric field environment. The survey has been repeated during every encounter of the Galileo's mission at Jupiter. The survey collects information at a very low rate (a few bits of data per second), but is important as it provides background or context information for higher rate observations recorded later in the encounter. The survey also allows scientists to track global changes in Jupiter's fields and particles from orbit to orbit. The sole remote sensing observation performed today is done by the near-infrared spectrometer. The observation is designed to look for changes in Io's surface due to recent volcanic activity. The geometry of the observation provides good nightside coverage of a region including the Prometheus volcano. Half of Io is in darkness and the other half is in sunlight at the time the observation is taken. Note 1. All times listed correspond to the Pacific Time zone (currently daylight saving) and spacecraft event time. Radio signals indicating that an event has occurred on the spacecraft reach the Earth 35 to 50 minutes later, depending on the time of year (currently 36.5 minutes). For more information on the Galileo spacecraft and its mission to Jupiter, please visit the Galileo home page: http://www.jpl.nasa.gov/galileo Hа сегодня все, пока! =SANA=

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