Topic: Transition of N21 Operations from B-String to A-String on February 28th.

Date/Time Issued: February 28, 2022 1429Z

Product(s) or Data Impacted: Real-time Data and End User Data Products (Latency)

Date/Time of Initial Impact (Primary): February 28, 2023 1601z (JDAY 059)

Date/Time of Expected End (Primary): February 28, 2023 1726z (JDAY 059)

Date/Time of Initial Impact (Secondary): February 28, 2023 1743z (JDAY 059)

Date/Time of Expected End (Secondary): February 28, 2023 19:09:00z (JDAY 059)

Date/Time of Initial Impact (Tertiary): February 28, 2023 19:26:00z (JDAY 059)

Date/Time of Expected End (Tertiary): February 28, 2023 20:50:00z (JDAY 059)

Back Orbit #1

Start Time | Stop Time | S/C | Orbit | Station
2/28/2023 16:12:55 | 2/28/2023 16:25:05 | J02 | 1566 | SVL
2/28/2023 16:16:56 | 2/28/2023 16:32:50 | OPS51 |  | MCM
2/28/2023 16:20:17 | 2/28/2023 16:36:00 | OPS53 |  | MCM
2/28/2023 16:37:49 | 2/28/2023 16:50:05 | J01 | 27358 | MCM
2/28/2023 16:41:01 | 2/28/2023 16:48:10 | NPP | 58755 | SVL
2/28/2023 16:58:31 | 2/28/2023 17:08:52 | GCOM | 57362 | SVL
2/28/2023 17:09:36 | 2/28/2023 17:21:30 | J02 | 1566 | TR

Back Orbit #2

Start Time | Stop Time | S/C | Orbit | Station
2/28/2023 17:56:24 | 2/28/2023 18:07:34 | J02 | 1567 | SVL
2/28/2023 17:58:04 | 2/28/2023 18:13:50 | OPS51 |  | MCM
2/28/2023 18:02:46 | 2/28/2023 18:17:33 | OPS53 |  | MCM
2/28/2023 18:21:48 | 2/28/2023 18:31:54 | J01 | 27359 | MCM
2/28/2023 18:24:25 | 2/28/2023 18:34:50 | NPP | 58756 | SVL
2/28/2023 18:39:08 | 2/28/2023 18:48:59 | GCOM | 57363 | SVL
2/28/2023 18:47:30 | 2/28/2023 19:00:43 | J02 | 1567 | TR

Back Orbit #3

Start Time | Stop Time | S/C | Orbit | Station
2/28/2023 19:39:14 | 2/28/2023 19:50:14 | J02 | 1568 | SVL
2/28/2023 19:40:04 | 2/28/2023 19:55:10 | OPS51 |  | MCM
2/28/2023 19:46:12 | 2/28/2023 19:59:31 | OPS53 |  | MCM
2/28/2023 20:05:56 | 2/28/2023 20:14:02 | J01 | 27360 | MCM
2/28/2023 20:07:09 | 2/28/2023 20:18:15 | NPP | 58757 | SVL
2/28/2023 20:19:04 | 2/28/2023 20:29:43 | GCOM | 57364 | SVL
2/28/2023 20:26:12 | 2/28/2023 20:40:08 | J02 | 1568 | TR

Length of Outage: Approximately 1.5 - 2 hours per transition opportunity

Details/Specifics of Change: The purpose of this notice is to inform multi-mission segments of the plan to move the JPSS-2 (N21) Common Ground System, Command, Control, and Communications operations for the JPSS constellation from the B string to the A string on February 28th, 2023. A backup date for this activity has been scheduled for March 2nd, 2023 in the event the first attempt needs to be waived. NPP, N20, N21, DMSP and GCOM-W1 missions may experience data latency during this transition.

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