Positions of STEREO A and B for 30-Aug-2026 06:00 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)      1.078572        1.009696        0.963423        0.265509        0.378376        0.383472
Semidiameter (arcsec)            889.721         950.412         996.061        3614.300        2536.174        2502.471

HCI longitude                    195.159         260.693         329.210         289.446         262.679          93.452
HCI latitude                       1.719           7.158           3.699           3.627          10.770          -1.239

Carrington longitude             287.931         353.465          61.982          22.218         355.451         186.224
Carrington rotation number      2315.200        2315.018        2314.828        2314.938        2315.013        2315.483

Heliographic (HEEQ) longitude    -65.534           0.000          68.517          28.752           1.986        -167.241
Heliographic (HEEQ) latitude       1.719           7.158           3.699           3.627          10.770          -1.239

HAE longitude                    271.019         336.532          44.776           5.203         338.561         169.236

Earth Ecliptic (HEE) longitude   -65.513           0.000          68.244          28.671           2.028        -167.296
Earth Ecliptic (HEE) latitude     -0.189           0.000          -0.025          -3.211           3.576           6.000

Roll from ecliptic north          -0.085                           0.012
Roll from solar north             -7.084                           6.237

Light travel time to Earth (min)           9.410           9.211                   6.551           5.264          11.518

Separation angle with Earth               65.513          68.244                  28.835           4.110         165.971
Separation angle A with B                        133.757

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 06:01:08 UTC
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