NOAA-20 Rephasing Maneuver Burn Planned for March 19th and 20th 2024
On March 20th, 2024, at 17:07:45 UTC, NOAA-20 will execute a propulsive maneuver to begin the rephasing campaign.
The following observatory systems will be affected on March 20th, 2024:
16:47:45 UTC - 19:08:34 UTC CERES in Contam-Safe mode, science data will not be available
16:57:45 UTC - 17:37:34 UTC OMPS in Decon mode, Science data will not be available
17:02:45 UTC - 17:45:34 UTC HRD will be turned off, data for direct broadcast users will be unavailable
NOAA-20 will be pointing off-nadir for 0:34:44. Data collected during that time period may be impacted and/or not disseminated
All of the above times are approximate and subject to change.
Rephasing NOAA-20 will take approximately 15 days. During this time, NOAA-20 will not meet its orbit requirements. Users should exercise caution when using the NOAA-20 science data. Any use of this data is undertaken at the user's own risk.
An orbit-raising maneuver will be performed on April 4th, 2024, to conclude the NOAA-20 rephasing campaign. The end time of the activity is approximate, and an updated notice will be issued to announce this activity.
NOAA20 orbit adjustment
Re: NOAA20 orbit adjustment
Update #2: On March 20th, 2024, 17:20:45 to 17:23:56, the NOAA-20 propulsive maneuver was executed successfully to begin the rephasing campaign. NOAA-20 was back in mission point at 17:40:34 UTC and will now drift at a lower altitude until it is 180 degrees to NOAA-21 in about 14 to 15 days. At which time the rephase team will raise the orbit to the correct altitude to meet orbital specs.
Direct Broadcast (HRD) was back on at 17:45:34 UTC.
Direct Broadcast (HRD) was back on at 17:45:34 UTC.
Re: NOAA20 orbit adjustment
Update #3: Issued April 02, 2024 1622Z On April 04, 2024 11:56:00Z, NOAA-20 will perform a 110 second propulsive Re-Phasing Maneuver (RPH) to re-establish mission orbit. The following observatory systems will be affected on April 04, 2024:
11:23:00Z - 13:39:12z CERES will be in Contam-Safe mode, science will not be available
11:33:00Z - 12:08:12z OMPS will be in DECON mode, science will not be available
11:38:00Z - 12:16:12z HRD will be off, data for direct broadcast users will be unavailable
11:50:00Z - 11:57:50z N20 in control frame 2 (Re-Phasing Maneuver (RPH)) Delta-V control frame
11:50:00Z - 12:05:12z N20 pointing nadir, collected data during that time period may be impacted and not disseminated
11:23:00Z - 13:39:12z CERES will be in Contam-Safe mode, science will not be available
11:33:00Z - 12:08:12z OMPS will be in DECON mode, science will not be available
11:38:00Z - 12:16:12z HRD will be off, data for direct broadcast users will be unavailable
11:50:00Z - 11:57:50z N20 in control frame 2 (Re-Phasing Maneuver (RPH)) Delta-V control frame
11:50:00Z - 12:05:12z N20 pointing nadir, collected data during that time period may be impacted and not disseminated
Re: NOAA20 orbit adjustment
Update #4 Issued April 04, 2024 1604Z: On April 4th, 2024, the NOAA-20 propulsive maneuver was executed successfully with a verified burn that was an expended delta-v duration of 299.2 thruster seconds on 11:56:00Z-11:57:50Z to complete the rephasing campaign.
12:08:13z OMPS returned to fully operational mode
12:10:12z HRD (Direct Broadcast) turned back on
13:39:20z CERES return to cross track mode
All NOAA-20 Level SDR products are approved for operational use.
During the NOAA-20 drifting period, impacts were seen in VIIRS Level 2 products that depend on orbital passing time for certain regions.
* VIIRS polar winds failed to produce products after 8 days of drifting. Production rules have been adjusted to rectify that.
* Other VIIRS L2 products that could be affected are VIIRS Flood Mapping for NWS mosaic and Sea Surface Temperature for CoastWatch regions.
* Production rules will be adjusted by no later than early next week according to the latest orbital passing time based on NOAA-20’s current (final) position.
12:08:13z OMPS returned to fully operational mode
12:10:12z HRD (Direct Broadcast) turned back on
13:39:20z CERES return to cross track mode
All NOAA-20 Level SDR products are approved for operational use.
During the NOAA-20 drifting period, impacts were seen in VIIRS Level 2 products that depend on orbital passing time for certain regions.
* VIIRS polar winds failed to produce products after 8 days of drifting. Production rules have been adjusted to rectify that.
* Other VIIRS L2 products that could be affected are VIIRS Flood Mapping for NWS mosaic and Sea Surface Temperature for CoastWatch regions.
* Production rules will be adjusted by no later than early next week according to the latest orbital passing time based on NOAA-20’s current (final) position.