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欧空局决定,预定在1993年发射的红外空间观测卫星(ISO)将采用24小时轨道取代原计划的12小时轨道。新轨道的数据是:远地点7000公里,近地点1000公里,倾角5度。采用较高轨道的原因是,在新轨道中,ISO的75％的工作时间将飞行在范·艾伦辐射带之外,这将大大减小因吸收质子和电子而对灵敏的红外探测器造成的影响。辐射背景的减小将极大地改进这台仪器的灵敏度。采用较高轨道的另一个优点是可以缩短ISO接近地球飞行的时间,
ESA decided that the infrared space mission satellite (ISO), scheduled for launch in 1993, will replace the planned 12-hour orbit with a 24-hour orbit. The data for the new orbit is: 7000 km apogee, 1000 km perigee, 5 degrees dip. The reason for using taller orbits is that in the new orbit, 75% of ISO’s working hours will fly out of the Van Allen band, which will greatly reduce the sensitivity of infrared detectors to the absorption of protons and electrons Impact. The reduction of the radiation background will greatly improve the sensitivity of this instrument. Another advantage of using a higher orbit is that it can shorten the time it takes for the ISO to approach the Earth,