Positions of STEREO A and B for 18-Aug-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)      1.073990        1.012200        0.962117        0.532958        0.294427        0.327183
Semidiameter (arcsec)            893.516         948.061         997.413        1800.568        3259.306        2933.003

HCI longitude                    185.148         249.409         317.124         267.491         190.738          36.682
HCI latitude                       0.461           6.795           4.948           3.859          -9.371           1.949

Carrington longitude              82.814         147.075         214.790         165.157          88.404         294.348
Carrington rotation number      2314.770        2314.591        2314.403        2314.541        2314.754        2314.182

Heliographic (HEEQ) longitude    -64.261          -0.000          67.715          18.082         -58.671         147.273
Heliographic (HEEQ) latitude       0.461           6.795           4.948           3.859          -9.371           1.949

HAE longitude                    260.931         325.326          32.661         343.258         265.242         112.029

Earth Ecliptic (HEE) longitude   -64.396           0.000          67.335          17.932         -60.084         146.702
Earth Ecliptic (HEE) latitude     -0.195          -0.000           0.001          -3.387         -10.649           6.266

Roll from ecliptic north          -0.094                           0.002
Roll from solar north             -7.316                           5.310

Light travel time to Earth (min)           9.256           9.110                   4.431           7.527          10.787

Separation angle with Earth               64.396          67.335                  18.239          60.650         146.185
Separation angle A with B                        131.730

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, 18-Aug-2026 15:01:06 UTC
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