Update #4 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 turned back on
13:39:20z CERES return to cross track mode
All NOAA-20 Level 1b 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.
Update #3: 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
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.
HRD was back on at 17:45:34 UTC.
The return of CERES to cross track mode at 19:08:54 completes the initial NOAA-20 rephase maneuver effort.
Update #1: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 maneuver sequence
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.
Topic: NOAA-20 Rephasing Maneuver Burn Planned for March 19th and 20th 2024
Date/Time issued: April 02, 2024 1622Z
HRD was back on at 17:45:34 UTC.
The return of CERES to cross track mode at 19:08:54 completes the initial NOAA-20 rephase maneuver effort.
Update #1: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 maneuver sequence
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.
Topic: NOAA-20 Rephasing Maneuver Burn Planned for March 19th and 20th 2024
Date/Time issued: April 02, 2024 1622Z
Product(s) or Data Impacted: All NOAA-20 L1 Sensor Data and downstream L2+ Data
Date/Time of Initial Impact: March 19th and 20th, 2024
Length of Outage: See Details and Special Note below.
Details/Specifics of Change: On March 19th and 20th, 2024 NOAA-20 will perform a sequence of propulsive maneuvers as part of an orbit rephasing effort to provide 180 degree separation between NOAA-20 and NOAA-21. The following observatory systems will be affected by the NOAA-20 rephasing activities on March 19th and 20th 2024:
CERES in Contam-Safe mode, science data will not be available for 2:22:44 per each maneuver
OMPS in Decon mode, Science data will not be available for 0:41:44 per each maneuver
HRD will be turned off; therefore, data for direct broadcast users will be unavailable for 0:44:44 per each maneuver sequence
NOAA-20 will be pointing off-nadir for 0:34:44 , collected data during that time period data may be impacted and not disseminated
All of the above times are approximate and subject to change
Special Note: Adherence to +/- 20 km ground track error will be violated while rephasing since
GTE is maintained via consistent orbital altitude/period. This requirement will have to be relaxed during rephasing.
Equator crossing time should be relatively maintained during phasing (13:30 +/- 10
min), preserving consistent lighting conditions during the drift period.
The drift period will last approximately 16 days, and may be subject to change due to maneuver spacecraft performance outcome or space environment factors. The satellite will remain in mission point with all instruments on during the drift period.
Another propulsive maneuver will conclude the drift period and end the rephasing campaign. Further details will be disseminated via an ESPC update notice as those details become available.
Contact Information for Further Information: ESPC Operations at ESPCOperations@noaa.gov and 301-817-3880.
Web Site(s) for Applicable Information: N/A
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