Positions of STEREO A and B for 19-Apr-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)      1.004036        1.004376        0.954869        0.723618        0.766742        0.417834
Semidiameter (arcsec)            955.771         955.447        1004.984        1326.153        1251.566        2296.674

HCI longitude                     71.756         133.504         188.908         246.302         340.948         239.186
HCI latitude                      -6.834          -5.271           1.231           3.553          15.075          -0.749

Carrington longitude             248.098         309.846           5.250          62.645         157.290          55.529
Carrington rotation number      2310.311        2310.139        2309.985        2309.826        2310.563        2309.846

Heliographic (HEEQ) longitude    -61.748           0.000          55.404         112.799        -152.556         105.682
Heliographic (HEEQ) latitude      -6.834          -5.271           1.231           3.553          15.075          -0.749

HAE longitude                    147.656         209.040         264.757         322.080          55.032         314.700

Earth Ecliptic (HEE) longitude   -61.385          -0.000          55.717         113.040        -154.009         105.660
Earth Ecliptic (HEE) latitude      0.058           0.000           0.098          -3.091          12.607          -6.973

Roll from ecliptic north           0.029                          -0.067
Roll from solar north              2.294                          -7.231

Light travel time to Earth (min)           8.526           7.623                  12.054          14.280           9.870

Separation angle with Earth               61.385          55.717                 113.005         151.305         105.542
Separation angle A with B                        117.101

Carrington rotation 2310 runs from 2026-04-15 15:50 (DOY 105.66) to
2026-05-12 21:40 (DOY 132.90), as seen from Earth.

Last Revised: Sunday, 19-Apr-2026 11:01:06 UTC
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