⚠️ Important Notice: The STEREO Science Center is expecting to experience service interruptions the week of March 9. Please see click here for more details.

STEREO Coordinated Observations Calendar - 2026

Below, please find the archived plans for STEREO operations in the year 2026. Some unplanned events are also included. All dates and times are UTC unless otherwise specified. More detailed plans can be found in the weekly schedules (Ahead, Behind). This page is also available as plain text.

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Scheduled activities for Week 01:

M Dec 29 (363) M2M Space Weather campaign begins
T Dec 30 (364) Ahead: Momentum dump, 13:30 UT
W Dec 31 (365)
T Jan 01 (001) New Year's Day
F Jan 02 (002)
S Jan 03 (003)
S Jan 04 (004)

Notes:

* NASA Moon-to-Mars Space Weather campaign, Dec 29 - Jan 21

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Scheduled activities for Week 02:

M Jan 05 (005)
T Jan 06 (006)
W Jan 07 (007)
T Jan 08 (008)
F Jan 09 (009)
S Jan 10 (010)
S Jan 11 (011)

Notes:

* NASA Moon-to-Mars Space Weather campaign, Dec 29 - Jan 21

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Scheduled activities for Week 03:

M Jan 12 (012)
T Jan 13 (013)
W Jan 14 (014)
T Jan 15 (015)
F Jan 16 (016)
S Jan 17 (017)
S Jan 18 (018)

Notes:

* NASA Moon-to-Mars Space Weather campaign, Dec 29 - Jan 21

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Scheduled activities for Week 04:

M Jan 19 (019)
T Jan 20 (020)
W Jan 21 (021)
T Jan 22 (022)
F Jan 23 (023)
S Jan 24 (024)
S Jan 25 (025)

Notes:

* NASA Moon-to-Mars Space Weather campaign, Dec 29 - Jan 21

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Scheduled activities for Week 05:

M Jan 26 (026)
T Jan 27 (027) Data gaps
W Jan 28 (028) Data gap
T Jan 29 (029)
F Jan 30 (030)
S Jan 31 (031)
S Feb 01 (032)

Notes:

* Data loss due to weather
     1/27  9:50-13:27 UT
     1/27 17:50 - 1/28 04:28

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Scheduled activities for Week 06:

M Feb 02 (033) Ahead: SECCHI stepped calibration roll, 07:35
T Feb 03 (034)
W Feb 04 (035)
T Feb 05 (036)
F Feb 06 (037)
S Feb 07 (038)
S Feb 08 (039)

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Scheduled activities for Week 07:

M Feb 09 (040)
T Feb 10 (041)
W Feb 11 (042) Ahead: Momentum dump, 14:30 UT, SECCHI Data Gap
T Feb 12 (043) SolO RSW 25 begins, SECCHI Data Gap
F Feb 13 (044)
S Feb 14 (045)
S Feb 15 (046)

Notes:

* Solar Orbiter Remote Sensing Window 25, Feb 12-27
    - HI1 20-min schedule (nominal COR2), Feb 15-21

* SECCHI Data Gap:
    -  Feb 11 20:00 - Feb 12 16:42 UT

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Scheduled activities for Week 08:

M Feb 16 (047)
T Feb 17 (048)
W Feb 18 (049)
T Feb 19 (050)
F Feb 20 (051)
S Feb 21 (052)
S Feb 22 (053)

Notes:

* Solar Orbiter Remote Sensing Window 25, Feb 12-27
    - HI1 20-min schedule (nominal COR2), Feb 15-21

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Scheduled activities for Week 09:

M Feb 23 (054)
T Feb 24 (055)
W Feb 25 (056)
T Feb 26 (057)
F Feb 27 (058)  SolO RSW 25 ends
S Feb 28 (059)  SolO RSW 26 begins
S Mar 01 (060)

Notes:

* Solar Orbiter Remote Sensing Window 25, Feb 12-27
* Solar Orbiter Remote Sensing Window 26, Feb 28 - Mar 10

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Plans last modified Thursday, 05-Mar-2026 19:05:11 UTC

Last Revised: Tuesday, 13-Jan-2026 18:49:53 UTC
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