Positions of STEREO A and B for 25-Aug-2026 09:00 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)      1.076791        1.010784        0.962887        0.401290        0.324810        0.357080
Semidiameter (arcsec)            891.193         949.389         996.616        2391.357        2954.424        2687.434

HCI longitude                    190.970         255.953         324.151         276.485         237.108          71.889
HCI latitude                       1.197           7.038           4.245           3.831           3.999           0.003

Carrington longitude             352.891          57.874         126.072          78.406          39.030         233.810
Carrington rotation number      2315.020        2314.839        2314.650        2314.782        2314.892        2314.351

Heliographic (HEEQ) longitude    -64.983           0.000          68.198          20.532         -18.845         175.936
Heliographic (HEEQ) latitude       1.197           7.038           4.245           3.831           3.999           0.003

HAE longitude                    266.799         331.827          39.700         352.247         312.940         147.518

Earth Ecliptic (HEE) longitude   -65.028           0.000          67.873          20.421         -18.887         175.692
Earth Ecliptic (HEE) latitude     -0.192           0.000          -0.014          -3.374          -2.098           6.895

Roll from ecliptic north          -0.089                           0.008
Roll from solar north             -7.208                           5.881

Light travel time to Earth (min)           9.344           9.170                   5.414           5.918          11.355

Separation angle with Earth               65.028          67.873                  20.686          18.999         171.875
Separation angle A with B                        132.900

Carrington rotation 2314 runs from 2026-08-02 12:28 (DOY 214.52) to
2026-08-29 18:07 (DOY 241.75), as seen from Earth.

Last Revised: Tuesday, 25-Aug-2026 09:01:09 UTC
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