Positions of STEREO A and B for 10-Jun-2026 10:00 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)      1.031270        1.015207        0.955089        0.144409        0.880402        0.430506
Semidiameter (arcsec)            930.530         945.253        1004.752        6645.214        1089.988        2229.070

HCI longitude                    122.716         183.393         243.897         186.507          26.369         127.612
HCI latitude                      -6.218           0.435           6.641           0.481           5.172          -2.785

Carrington longitude             282.061         342.738          43.242         345.851         185.714         286.956
Carrington rotation number      2312.216        2312.048        2311.880        2312.039        2312.484        2312.203

Heliographic (HEEQ) longitude    -60.677          -0.000          60.504           3.113        -157.024         -55.781
Heliographic (HEEQ) latitude      -6.218           0.435           6.641           0.481           5.172          -2.785

HAE longitude                    198.266         259.187         319.851         262.281         101.361         203.384

Earth Ecliptic (HEE) longitude   -60.921           0.000          60.664           3.094        -157.825         -55.802
Earth Ecliptic (HEE) latitude     -0.108           0.000           0.120          -0.346           8.355           2.960

Roll from ecliptic north          -0.063                          -0.065
Roll from solar north             -3.975                          -3.249

Light travel time to Earth (min)           8.630           8.287                   7.245          15.434           7.084

Separation angle with Earth               60.921          60.664                   3.114         156.378          55.854
Separation angle A with B                        121.585

Carrington rotation 2312 runs from 2026-06-09 02:41 (DOY 160.11) to
2026-07-06 07:26 (DOY 187.31), as seen from Earth.

Last Revised: Wednesday, 10-Jun-2026 10:01:06 UTC
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