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: March 13, 2024 2116z


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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