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SUBJECT: ADMINISTRATIVE: NOAA-21 VIIRS LUNAR CALIBRATION ROLL MANEUVER
 SCHEDULED FOR DECEMBER 01, 2025 - ISSUED: NOVEMBER 20, 2025 2017Z
TO: ESPC.NOTIFICATION@NOAA.GOV
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*TOPIC: *NOAA-21 VIIRS LUNAR CALIBRATION ROLL MANEUVER SCHEDULED FOR
DECEMBER 01, 2025

*DATE/TIME ISSUED: * NOVEMBER 20, 2025 2017Z

*PRODUCT(S) OR DATA IMPACTED: *ALL NOAA-21 SENSOR DATA

*DATE/TIME OF INITIAL IMPACT: *  DECEMBER 01, 2025 05:59:19Z

*DATE/TIME OF EXPECTED END:   *DECEMBER 01, 2025 06:12:54Z

*LENGTH OF OUTAGE: *SEE DETAILS.

*DETAILS/SPECIFICS:* ON DECEMBER 01, 2025, NOAA-21 WILL PERFORM A
SPACECRAFT ATTITUDE MANEUVER FOR THE VIIRS LUNAR CALIBRATION. SCIENCE
DATA
MAY BE IMPACTED WHILE THE SPACECRAFT IS POINTING OFF-NADIR DURING THE
ATTITUDE MANEUVER. THE TIMELINE OF EVENTS FOR THIS MANEUVER ARE
PROVIDED
BELOW.

THE FOLLOWING OBSERVATORY SYSTEMS WILL BE AFFECTED ON DECEMBER 01, 2025
DURING THE LUNAR ROLL ACTIVITY :
*06:00:20Z - 06:12:22Z *  HRD WILL BE OFF, DATA FOR DIRECT BROADCAST
USERS
WILL BE UNAVAILABLE
*05:59:50Z - 06:12:53Z *  VIIRS ENCODER OFFSET AND GAIN WILL BE SET FOR
MOON OBSERVATION
*06:00:22Z - 06:12:22Z*   NOAA-21 WILL BE POINTING OFF-NADIR, COLLECTED
DATA MAY BE IMPACTED AND NOT DISSEMINATED

THIS MESSAGE WAS SENT BY ESPC.NOTIFICATION@NOAA.GOV. YOU HAVE BEEN SENT
THIS AND OTHER NOTIFICATIONS BECAUSE YOU HAVE OPTED IN TO RECEIVE
IT. IF
FOR ANY REASON, YOU WISH TO UNSUBSCRIBE, PLEASE CONTACT ESPC HELP
DESK AT
ESPCOPERATIONS@NOAA.GOV OR (301) 817-3880. PLEASE NOTE: IT MAY TAKE
UP TO
TWO BUSINESS DAYS TO PROCESS YOUR UNSUBSCRIBE REQUEST.

--0000000000007B332906440C6238
CONTENT-TYPE: TEXT/HTML; CHARSET="UTF-8"
CONTENT-TRANSFER-ENCODING: QUOTED-PRINTABLE

TOPIC:=C2=A0NOAA-21 VIIRS LUNAR CALIBRATION ROLL MANEUVER
SCHEDUL=
ED FOR DECEMBER 01, 2025

DATE/TIME ISSUED:=C2=A0=C2=A0NOVEMBER
20, =
2025 2017Z
PRODUCT(S) OR DATA IMPACTED:=C2=A0ALL NOAA-21 SENSOR
DATA

DATE/TIME
OF INI=
TIAL IMPACT:=C2=A0=C2=A0=C2=A0DECEMBER 01,
2025=C2=A005:59:19Z

DATE/TIME
OF EX=
PECTED END:=C2=A0 =C2=A0DECEMBER 01, 2025
06:12:54Z

LENGTH OF
OUTAGE:=C2=A0SEE DETAILS.
=

DETAILS/SPECIFICS:=C2=A0ON=C2=A0DECEMB=
ER=C2=A001,
2025, NOA=
A-21 WILL PERFORM A SPACECRAFT ATTITUDE MANEUVER FOR THE VIIRS
LUNAR CALIBR=
ATION. SCIENCE DATA MAY BE IMPACTED WHILE THE SPACECRAFT IS POINTING
OFF-NA=
DIR DURING THE ATTITUDE MANEUVER. THE TIMELINE OF EVENTS FOR THIS
MANEUVER =
ARE PROVIDED BELOW.

THE FOLLOWING OBSERVATORY SYSTEMS WILL
BE AFF=
ECTED ON=C2=A0DECEMBE=
R=C2=A001,
2025 DURIN=
G THE LUNAR ROLL ACTIVITY :
06:00:20Z - 06:12:22Z=C2=A0=C2=A0=C2=A0HRD WILL BE OFF, DATA FOR DIRECT
BROADCAST US=
ERS WILL BE UNAVAILABLE
05:59:50Z - 06:12:53Z=C2=A0=C2=A0=C2=A0VIIRS ENCODER OFFSET AND GAIN WILL BE SET
FOR MOO=
N OBSERVATION
06:00:22Z -
06:12:22Z<=
/B>=C2=A0=C2=A0=C2=A0NOAA-21
WILL BE =
POINTING OFF-NADIR, COLLECTED DATA MAY BE IMPACTED AND NOT
DISSEMINATED

THIS MESSAGE WAS SENT
BY=C2=A0ESPC.NOTIFICATION@NOAA.GOV. YOU HAVE
BEEN S=
ENT THIS AND OTHER NOTIFICATIONS BECAUSE YOU HAVE OPTED IN TO RECEIVE
IT. I=
F FOR ANY REASON, YOU WISH TO UNSUBSCRIBE, PLEASE CONTACT ESPC HELP
DESK AT=
=C2=A0ESPCOPERATIONS@NOAA.G=
OV=C2=A0OR=
 (301) 817-3880. PLEASE NOTE: IT MAY TAKE UP TO TWO BUSINESS DAYS
 TO PROCES=
S YOUR UNSUBSCRIBE REQUEST.


--0000000000007B332906440C6238--


=