Positions of STEREO A and B for 13-Apr-2026 15:00 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)      1.002431        1.002743        0.955200        0.699209        0.720591        0.442604
Semidiameter (arcsec)            957.300         957.003        1004.635        1372.448        1331.723        2168.140

HCI longitude                     65.895         127.787         182.779         242.974         333.818         220.143
HCI latitude                      -6.550          -5.741           0.447           3.460          15.878          -1.782

Carrington longitude             324.980          26.871          81.863         142.058         232.903         119.227
Carrington rotation number      2310.097        2309.925        2309.773        2309.605        2310.353        2309.669

Heliographic (HEEQ) longitude    -61.892           0.000          54.992         115.187        -153.968          92.356
Heliographic (HEEQ) latitude      -6.550          -5.741           0.447           3.460          15.878          -1.782

HAE longitude                    141.828         203.330         258.579         318.753          47.943         295.508

Earth Ecliptic (HEE) longitude   -61.502           0.000          55.249         115.423        -155.387          92.179
Earth Ecliptic (HEE) latitude      0.077           0.000           0.089          -3.004          12.584          -6.444

Roll from ecliptic north           0.039                          -0.062
Roll from solar north              2.994                          -7.305

Light travel time to Earth (min)           8.527           7.559                  12.040          13.935           9.243

Separation angle with Earth               61.502          55.249                 115.386         152.536          92.165
Separation angle A with B                        116.750

Carrington rotation 2309 runs from 2026-03-19 08:57 (DOY  78.37) to
2026-04-15 15:50 (DOY 105.66), as seen from Earth.

Last Revised: Monday, 13-Apr-2026 15:01:06 UTC
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