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Positions of STEREO A and B for 13-Mar-2026 11:00 UT

This figure plots the current positions of the STEREO Ahead (red) and Behind (blue) spacecraft relative to the Sun (yellow) and Earth (green). The dotted lines show the angular displacement from the Sun. Units are in A.U.

When the two spacecraft are close to Earth, an expanded view of the region around Earth will appear on the right, in the same orientation as the Sun-centered view.

Other resources:

• STEREO Orbit Tool
• STEREO-A Fly-by Orbit Tool for Summer 2023
• STEREO-A roll angle during Fly-By
• STEREO orbit simulations
• Satellite Situation Center (SSCWeb)
• HelioWeb
• Attitude and orbit text files (CalTech)
• Early orbit summary
• Connections with Parker Solar Probe
• Explanation of coordinate systems

                                STEREO-B           Earth        STEREO-A       Parker SP   Solar Orbiter     BepiColombo

Heliocentric distance (AU)      1.000569        0.993939        0.957918        0.119142        0.362971        0.435679
Semidiameter (arcsec)            959.082         965.479        1001.785        8054.466        2643.816        2202.603

HCI longitude                     34.561          96.798         150.096         177.597         256.658         130.515
HCI latitude                      -3.971          -7.201          -3.600          -0.119           9.339          -2.883

Carrington longitude              15.726          77.963         131.261         158.762         237.823         111.680
Carrington rotation number      2308.956        2308.783        2308.635        2308.559        2308.339        2308.690

Heliographic (HEEQ) longitude    -62.237          -0.000          53.298          80.799         159.860          33.717
Heliographic (HEEQ) latitude      -3.971          -7.201          -3.600          -0.119           9.339          -2.883

HAE longitude                    110.526         172.510         225.665         253.367         332.593         206.271

Earth Ecliptic (HEE) longitude   -61.984          -0.000          53.155          80.857         160.083          33.761
Earth Ecliptic (HEE) latitude      0.160           0.000           0.027           0.181           2.279           2.632

Roll from ecliptic north           0.083                          -0.022
Roll from solar north              6.050                          -6.304

Light travel time to Earth (min)           8.542           7.268                   8.168          11.151           5.632

Separation angle with Earth               61.984          53.155                  80.857         159.958          33.851
Separation angle A with B                        115.139

Carrington rotation 2308 runs from 2026-02-20 01:10 (DOY  51.05) to
2026-03-19 08:57 (DOY  78.37), as seen from Earth.

Last Revised: Friday, 13-Mar-2026 11:01:07 UTC
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