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WG3K > ANS 10.06.25 20:01l 26 Lines 1418 Bytes #178 (0) @ AMSAT
BID : ANS159.2
Subj: NOAA-18 Decommissioned
Path: IZ3LSV<DB0ERF<DK0WUE<HB9ON<HB9ON<PI8ZTM<PI8LAP<VE2PKT<VE3CGR<WW4BSA<
N3HYM<WG3K
Sent: 250610/1743Z 18536@WG3K.#SMD.MD.USA.NOAM LinBPQ6.0.24
*NOAA-18 (Credit: NOAA)*
On May 31, 2025 at 1605 UTC, the NOAA-18 S-band Transmitter 4 (STX4)
experienced a power drop from 7W to 0.8W. STX4 is the only remaining
transmitter used for up-link (commanding) and downlink (telemetry & global
science data from the recorder). Full recovery of the S-Band transmitter
and its functionality is not possible, and therefore jeopardizes the
ability to ensure safe operation of the spacecraft. Based on NOAAâ€Ös
requirement to responsibly manage on-orbit assets, NOAA decommissioned
NOAA-18 on June 6, 2025 between 1733 and 1749 UTC and the APT signal
transmission ceasing was observed by amateur observers.
NOAA-18 is a legacy Polar Operational Environmental Satellites (POES)
satellite and is operated with no performance or latency requirements.
Users should transition to NOAA's Joint Polar Satellite System (JPSS).
JPSS provides global observations that serve as the backbone of both short-
and long-term forecasts, including those that help us predict and prepare
for severe weather events. The five satellites scheduled in the fleet are
the currently-flying NOAA/NASA Suomi National Polar-orbiting Partnership
(Suomi NPP) satellite, NOAA-20, previously known as JPSS-1, NOAA-21,
previously known as JPSS-2, and the upcoming JPSS-3 and JPSS-4 satellites.
*[ANS thanks the NOAA National Environmental Satellite, Data, and
Information Service for the above information]*
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