Positions of STEREO A and B for 30-Aug-2026 12:00 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)      1.078658        1.009640        0.963450        0.257108        0.381470        0.384839
Semidiameter (arcsec)            889.650         950.466         996.033        3732.398        2515.607        2493.583

HCI longitude                    195.374         260.937         329.469         290.507         263.807          94.478
HCI latitude                       1.746           7.163           3.670           3.602          11.025          -1.295

Carrington longitude             284.600         350.163          58.695          19.733         353.034         183.704
Carrington rotation number      2315.209        2315.027        2314.837        2314.945        2315.019        2315.490

Heliographic (HEEQ) longitude    -65.563          -0.000          68.533          29.571           2.871        -166.459
Heliographic (HEEQ) latitude       1.746           7.163           3.670           3.602          11.025          -1.295

HAE longitude                    271.235         336.774          45.036           6.264         339.674         170.267

Earth Ecliptic (HEE) longitude   -65.539          -0.000          68.263          29.490           2.900        -166.507
Earth Ecliptic (HEE) latitude     -0.188          -0.000          -0.026          -3.191           3.814           5.935

Roll from ecliptic north          -0.085                           0.012
Roll from solar north             -7.076                           6.254

Light travel time to Earth (min)           9.414           9.213                   6.624           5.242          11.522

Separation angle with Earth               65.539          68.263                  29.647           4.790         165.281
Separation angle A with B                        133.801

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 12:01:06 UTC
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