Update #3:
Extra maneuver: Station Keeping maneuver on April 10th at 02h02m07s Zulu was performed with an sma change of -40.5m.
3rd depletion maneuver was performed on April 10th/11th: First burn on April 10th at 22h20m48s, Dv = 2.072m/s, Second burn on April 11th at 05h48m06s, Dv= -2,062 m/s
4th depletion maneuver was performed on April 11th/12th: First burn on April 11th at 22h34m44s, Dv = -2.0198m/s, Second burn on April 12th at 04h10m11s, Dv = 2.0169m/s
Extra maneuver: Station Keeping maneuver on April 13th at 04h24m27s Zulu was performed with an sma change of -29.87m.
5th depletion maneuver was performed on April 16th/17th: First burn on April 16th at 21h52m45s, Dv = -1.9655 m/s, Second burn on April 17th at 03h28m13s, Dv =+1.959 m/s.

Activities to come
6th depletion maneuver April 17th / 18th: First burn on April 17th at 22h06m44s, Dv = +1,91m/s, Duration=589.125s, Second burn on April 18th at 03h42m12s, Dv =-1,91m/s, Duration=596.75s
Eventual Station Keeping maneuver on April 19th (TBC)
7th depletion maneuver on April 23rd (TBC according to the remaining fuel)

Update #2:
3rd depletion maneuver: First burn on April 10th at 22h20m48s , Dv = 2.07m/s, Duration = 580.875 s, Second burn on April 11th at 05h48m06s , Dv = -2.07m/s, Duration = 590.25 s
4th depletion maneuver: First burn on April 11th at 22h34 (TBC), Second burn on April 12th at 04h10 (TBC)
Eventual Station Keeping maneuver: April 13th (TBC)
5th depletion maneuver: on April 17th (TBC)
6th depletion maneuver: on April 18th (exact time given later)
Eventual Station Keeping maneuver: April 19th (TBC)
7th depletion maneuver: April 23rd (TBC according to the remaining fuel)
Each maneuver is an inclination maneuver (back and forth).

Update #1: The first two fuel depletion maneuvers we performed as scheduled on April 6th, 8th and 9th, resulting in degraded sea surface height measurements. A station keeping maneuver was executed at 02h02m07s Z on April 10th with a small decrease of -40.5m (instead of the third depletion maneuver). This maneuver also resulted in degraded sea surface height measurements. Additional maneuvers and degraded sea surface height measurements can be expected over the next several days.

Topic: Jason-2 Depletion Maneuvers

Date Issued: Issued April 17, 2018 1635Z

Product(s) or Data Impacted: Jason-2 Operational Geophysical Data Records (OGDRs)

Date/Time of Initial Impact: April 6, 2018 0054Z

Date/Time of Expected End: April 17, 2018

Length of Event: TBD

Details/Specifics of Change:
A number of Jason-2 fuel depletion maneuvers are scheduled from April 6 to April 17, 2018. The first two maneuvers are scheduled for April 6 and April 8-9, 2018. The exact times of the remaining maneuvers will be given in later updates.

1st maneuver: The first burn will occur on April 6 at 00h54m32s Di = +0.01846\xB0 with a duration of 586.5s Dv = 2.29m/s. The second burn will occur at 06h29m58s Di =-0.01846\xB0 with a duration of 598.13s Dv = -2.29m/s.
2nd maneuver: The first burn will occur April 8 at 23h49m30s. The second burn will occur on April 9 at 05h25m02s.
3rd maneuver: April 10th (exact time given later)
4th maneuver: April 11th (exact time given later)
5th maneuver: April 12th (exact time given later)
6th maneuver: April 13th (exact time given later)
7th maneuver: April 17th (TBC according to the remaining fuel)

The maneuvers will be performed mostly, but not completely, over land. Sea surface height measurements from telemetry during the maneuvers is expected to be degraded. In addition, products could be impacted 30 minutes before each maneuver and up to 2 hours following each maneuver. Wind and wave content in the products will not be impacted.

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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