Positions of STEREO A and B for 30-Aug-2026 08:00 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)      1.078601        1.009677        0.963432        0.262728        0.379405        0.383928
Semidiameter (arcsec)            889.697         950.430         996.052        3652.547        2529.297        2499.500

HCI longitude                    195.231         260.774         329.296         289.792         263.057          93.795
HCI latitude                       1.728           7.160           3.689           3.619          10.856          -1.258

Carrington longitude             286.821         352.364          60.887          21.382         354.647         185.385
Carrington rotation number      2315.203        2315.021        2314.831        2314.941        2315.015        2315.485

Heliographic (HEEQ) longitude    -65.544          -0.000          68.522          29.018           2.283        -166.979
Heliographic (HEEQ) latitude       1.728           7.160           3.689           3.619          10.856          -1.258

HAE longitude                    271.091         336.613          44.863           5.549         338.934         169.581

Earth Ecliptic (HEE) longitude   -65.522          -0.000          68.250          28.936           2.321        -167.032
Earth Ecliptic (HEE) latitude     -0.189           0.000          -0.025          -3.205           3.656           5.978

Roll from ecliptic north          -0.085                           0.012
Roll from solar north             -7.081                           6.243

Light travel time to Earth (min)           9.411           9.212                   6.575           5.257          11.520

Separation angle with Earth               65.522          68.250                  29.098           4.329         165.741
Separation angle A with B                        133.772

Carrington rotation 2315 runs from 2026-08-29 18:07 (DOY 241.75) to
2026-09-26 00:28 (DOY 269.02), as seen from Earth.

Last Revised: Sunday, 30-Aug-2026 08:01:06 UTC
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