NAIC-IRIDIUM Coordination Agreement

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Дата изменения: Mon Oct 9 23:53:00 2000
Дата индексирования: Mon Oct 1 23:08:33 2012
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Coordination with IRIDIUM

The National Astronomy and Ionosphere Center and Motorola Inc., which operates the IRIDIUM satellite system, have signed a Coordination Agreement. The Agreement addresses potential interference produced by the communication satellite system with observations of the astronomically important 1612 MHz line of the OH molecule in the 1610.6 - 1613.8 MHz band. The Agreement guarantees that :

(a) during scheduled observations in this band, between 10 pm and 6 am Miami local time, IRIDIUM's out-of-band emission will be below -238 dB W per meter sq. per Hz. level for all seven days of the week,

(b) day time of up to 8-passes per year will be available for observations defined as targets of opportunity that could not be observed using a blanker provided by IRIDIUM. Such objects includes comets, supernovae and other celestial objects that are of unknown nature as yet.

Congratulations to Dr. Willem Baan, Dr. Mike Davis, Dr. Paul Goldsmith, Dr. Thomas Gergely (of NSF) and Mr. Paul Feldman (Attorney), for this successful outcome of their persistent efforts in this negotiation process lasting over several years. The major achievement for the astronomy community has been the inclusion of the level, below which IRIDIUM has agreed to restrain their out-of-band emission. However, in order to perform any observation in this band, NAIC will have to install very expensive superconducting Notch- filter, so that the effect of the up-link can be suppressed to a tolerable level and to schedule most OH observations at nights.

The complete document can be viewed here: ( NAIC-IRIDIUM Coordination Agreement )

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Reinaldo Velez (10/09/2000)