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The MPC Users' Group (MUG) invites community feedback on any issues, concerns, or questions about the MPC.


Please provide feedback on the SBN website.

PDS Support

Mission Websites

Here we list links to the primary mission website as well as pages about the mission on other sites such as the NSSDC, NASA portal, etc.

Suisei Mission

Suisei (Planet-A) was a mission to flyby comet 1P/Halley planned by Japan's Institute of Space and Astronautical Science (ISAS). Launched on 18 August 1985, Suisei carried two instruments in order to study the growth and the decay of the cometary object's hydrogen corona, and the interaction of the solar wind with the cometary ionosphere. Suisei encountered 1P/Halley on 8 March 1986 at a distance of 151,000 kilometers on the sunward side.

The spacecraft's thrusters were depleted of hydrazine on 22 February 1991 causing future planned encounters to be canceled. ISAS had planned to send Suisei by 21P/Giacobini-Zinner on 24 November 1998 and 55P/Tempel-Tuttle on 28 February 1998.

SBN lead the effort to archive the data from Suisei into the PDS.


Data Sets

1P/Halley Encounter

Other Target Observations

Related Datasets

Use the Small Bodies Data Ferret to find other datasets for this mission/target.