Positions of STEREO A and B for 6-Oct-2026 00:00 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)      1.084721        0.999929        0.966515        0.690211        0.774096        0.458396
Semidiameter (arcsec)            884.677         959.696         992.874        1390.339        1239.676        2093.447

HCI longitude                    226.552         296.808           7.055         242.089         342.113         206.245
HCI latitude                       5.148           6.478          -0.995           3.433          14.922          -2.412

Carrington longitude             158.047         228.304         298.551         173.584         273.609         137.740
Carrington rotation number      2316.561        2316.366        2316.171        2316.518        2316.240        2316.617

Heliographic (HEEQ) longitude    -70.256           0.000          70.247         -54.720          45.305         -90.563
Heliographic (HEEQ) latitude       5.148           6.478          -0.995           3.433          14.922          -2.412

HAE longitude                    302.536          12.390          82.890         317.868          56.196         281.554

Earth Ecliptic (HEE) longitude   -69.853           0.000          70.500         -54.522          43.806         -90.835
Earth Ecliptic (HEE) latitude     -0.132           0.000          -0.095          -2.980          12.593          -5.599

Roll from ecliptic north          -0.046                           0.034
Roll from solar north             -5.026                           7.230

Light travel time to Earth (min)           9.944           9.442                   6.839           5.932           9.199

Separation angle with Earth               69.853          70.500                  54.577          45.225          90.831
Separation angle A with B                        140.353

Carrington rotation 2316 runs from 2026-09-26 00:28 (DOY 269.02) to
2026-10-23 07:22 (DOY 296.31), as seen from Earth.

Last Revised: Tuesday, 06-Oct-2026 00:01:06 UTC
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