Control of Galaxy IV was lost on May 19, 1998 when the satellite's primary control processor failed. The backup control processor had suffered a previously undetected anomaly, and PanAmSat was not able to regain control of the spacecraft. Galaxy IV was declared a loss on May 20, 1998. Failure of the primary control processor was attributed to tin whisker growth, a phenomenon in which tendrils grow from solder, causing an electrical short circuit. Engineers believe that a hole developed in the conformal wax coating over the solder, allowing whiskers to develop. The satellite manufacturer, Hughes, has replaced pure tin plating with nickel to alleviate the problem in newer designs, adding 100 to 200 pounds (50 to 90 kg) per payload.[2]
The loss of this satellite was very disruptive to telecommunications in the United States. 80% of pager service in the U.S. went down; service was not restored until the following day.[3] Many fast-pay gas pumps were not able to verify credit card transactions. Wire news services, like Reuters, were also affected. The TV network CBS had to use alternate means of transmitting its programs. All 600 NPR-affiliated stations (as well as numerous other broadcasters) lost access to current network shows and newscasts.[4]
After the incident, Galaxy IV's assigned orbital slot was briefly occupied by Galaxy 4R, and is now occupied by the Galaxy VI satellite. Galaxy VI's relocation required an emergency order from the FCC, taking one week drift time to change orbit.[5] Galaxy IV remains in space.
galaxy, model, satellite, built, hughes, space, communications, company, satellite, which, carried, payload, both, band, band, transponders, launched, june, 1993, operated, panamsat, corporation, geostationary, orbit, mission, typecommunicationscospar, id1993,. Galaxy IV was a model HS 601 satellite built by Hughes Space and Communications Company HSC The satellite which carried a payload of both C band and Ku band transponders was launched on June 24 1993 and operated by PanAmSat Corporation 1 It was in geostationary orbit at 99 W Galaxy IVMission typeCommunicationsCOSPAR ID1993 039ASATCAT no 22694Spacecraft propertiesBusHS 601ManufacturerHughesStart of missionLaunch dateJune 24 1993RocketAriane 42PLaunch siteKourou ELA 2ContractorArianespaceTranspondersBand24 C band24 Ku band This article is about the Intelsat satellite For other uses see Galaxy 4 disambiguation Failure editControl of Galaxy IV was lost on May 19 1998 when the satellite s primary control processor failed The backup control processor had suffered a previously undetected anomaly and PanAmSat was not able to regain control of the spacecraft Galaxy IV was declared a loss on May 20 1998 Failure of the primary control processor was attributed to tin whisker growth a phenomenon in which tendrils grow from solder causing an electrical short circuit Engineers believe that a hole developed in the conformal wax coating over the solder allowing whiskers to develop The satellite manufacturer Hughes has replaced pure tin plating with nickel to alleviate the problem in newer designs adding 100 to 200 pounds 50 to 90 kg per payload 2 The loss of this satellite was very disruptive to telecommunications in the United States 80 of pager service in the U S went down service was not restored until the following day 3 Many fast pay gas pumps were not able to verify credit card transactions Wire news services like Reuters were also affected The TV network CBS had to use alternate means of transmitting its programs All 600 NPR affiliated stations as well as numerous other broadcasters lost access to current network shows and newscasts 4 After the incident Galaxy IV s assigned orbital slot was briefly occupied by Galaxy 4R and is now occupied by the Galaxy VI satellite Galaxy VI s relocation required an emergency order from the FCC taking one week drift time to change orbit 5 Galaxy IV remains in space References edit Galaxy 4 7 HGS 4 Gunter s Space Page Retrieved 2021 04 17 Felps Bruce 1999 05 17 Whiskers Caused Satellite Failure Galaxy IV Outage Blamed On Interstellar Phenomenon Wireless Week Archived from the original on March 3 2009 Duke Alan Galaxy 4 satellite not expected to be restored cnn com Archived from the original on 1 October 2000 Retrieved 2 April 2018 Trainor Joseph Satellite Failure Causes Communications Chaos Zeta Talk Retrieved 2 April 2018 PanAmSat Corporation 13 FCC Rcd 11 894 1998 External links editHughes Statement on Galaxy IV Anomaly nbsp This article about one or more communications satellites is a stub You can help Wikipedia by expanding it vte Retrieved from https en wikipedia org w index php title Galaxy IV amp oldid 1211840482, wikipedia, wiki, book, books, library,
