NOAA-20 (JPSS-1) Planned Rephasing Maneuver Burn on March 20, 2024 and its potential effects on Level-1 VIIRS data products
| Platform | NOAA20 |
|---|---|
| Instrument | VIIRS |
| Source | MODAPS, LAADS |
| Issue | Alert |
| Last Updated | 2024-04-11 16:00:00 |
| Start | 2024-03-20 00:00:00 |
| End | 2024-04-06 23:00:00 |
| Description |
Updated 2024-04-11T16:00:00Z -- The NOAA-20 spacecraft successfully underwent a rephasing maneuver between
March 20th, 2024, and April 4th, 2024, as part of an orbit rephasing to provide a 180-degree separation
between NOAA-20 and NOAA-21. The instruments onboard NOAA-20 remained in mission-pointing-mode during
the drift period which lasted for 16 days. The first propulsive burn maneuver successfully completed on March 20th, 2024,
and lowered the spacecraft's altitude to a lower orbit. It drifted for 16 days until its position was aligned at 180
degrees from NOAA-21, after which another propulsive burn was performed successfully on April 4th, 2024, to raise
the spacecraft back to its nominal orbit.
The processing of all NOAA-20/J1 VIIRS land science products by the Land-SIPS was suspended for the duration,
pending assessment by the VIIRS instrument Calibration and QA teams. Following approvals by all concerned teams, the processing of those products has now resumed.
We expect all the processing and data dissemination activities to continue nominally from here onwards.
For additional details, please consult the LDOPE note posted
here.
----------------- Updated 2024-03-25T19:00:00Z -- Processing of NOAA-20 (J1) data is being restarted on nrt3 and nrt4 with data from 3/25/24, with a few granules at the end of 3/24/24. Users should exercise caution when using this data as it may still be impacted by the rephasing. ----------------- On March 20, 2024, at 17:07:45 UTC, NOAA-20 plans to execute a propulsive maneuver to begin a rephasing operation in order to provide a 180-degree separation between NOAA-20 (JPSS-1) and NOAA-21 (JPSS-2) platforms. This rephasing campaign and the associated drift will likely last about 16 days, which may change based on the maneuver performance outcome. All the instruments will remain functional during this drift period although NOAA-20 will not meet its orbit or altitude requirement specifications. The plans call for performing an orbit-raising maneuver on April 4th 2024, which will conclude the rephasing campaign (this end time is approximate and subject to change). All NOAA-20 VIIRS standard Level-1 data products acquired and processed during this rephasing campaign will remain in a non-public test archive, which the LAADS DAAC will eventually release after we understand and correct for their radiometric and geometric disposition, quality, etc. Given these conditions, we will also halt all LANCE Near-Real-Time (NRT) production for the duration of this rephasing campaign, i.e., March 20 through April 4th (subject to change). Please monitor these alerts for updated information after March 20, 2024. |