Positions of STEREO A and B for 23-Jul-2026 11:00 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)      1.060003        1.015869        0.959039        0.730767        0.576275        0.394532
Semidiameter (arcsec)            905.306         944.637        1000.614        1313.179        1665.227        2432.320

HCI longitude                    162.228         224.264         289.647         249.890          75.546         257.583
HCI latitude                      -2.410           5.078           6.892           3.641          -9.062           0.336

Carrington longitude              71.052         133.088         198.471         158.714         344.370         166.408
Carrington rotation number      2313.803        2313.630        2313.449        2313.559        2314.043        2313.538

Heliographic (HEEQ) longitude    -62.036          -0.000          65.383          25.626        -148.718          33.320
Heliographic (HEEQ) latitude      -2.410           5.078           6.892           3.641          -9.062           0.336

HAE longitude                    237.837         300.260           5.265         325.666         151.487         333.262

Earth Ecliptic (HEE) longitude   -62.423           0.000          65.005          25.406        -148.773          33.002
Earth Ecliptic (HEE) latitude     -0.188           0.000           0.059          -3.172          -2.035          -6.747

Roll from ecliptic north          -0.100                          -0.024
Roll from solar north             -7.004                           2.409

Light travel time to Earth (min)           8.953           8.835                   3.962          12.790           5.998

Separation angle with Earth               62.423          65.005                  25.590         148.714          33.608
Separation angle A with B                        127.428

Carrington rotation 2313 runs from 2026-07-06 07:26 (DOY 187.31) to
2026-08-02 12:28 (DOY 214.52), as seen from Earth.

Last Revised: Thursday, 23-Jul-2026 11:01:07 UTC
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