International Halley Watch

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The International Halley Watch (IHW) was a project run by NASA's Jet Propulsion Laboratory (JPL), in Pasadena, California. The project ran for almost all of the decade of the 1980s, and it concerned the observation (by any means) of Halley's Comet. The purpose of the project was to coordinate the efforts of amateur astronomers around the world, and to collect raw data to be used in comparison with other observations and calculations. The information derived would be used to update navigational information on unmanned probes sent to the comet during its 1986 perihelion.

Stephen J. Edberg, was amongst the most important contributors of the project, a coordinator and writer of the IHW Observer's Manual, International Halley Watch Amateur Observers' Manual for Scientific Comet Studies.

During the duration of the project, the IHW was providing assistance and support to thousand of amateurs and was regularly distributing its IHW Newsletter (in hard copy, that was pre-world wide web era).

The final issue of the IHW Newsletter included a list of all the names of the amateurs who contributed observations of any kind.