Positions of STEREO A and B for 18-Jun-2026 08:00 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)      1.036632        1.015991        0.955613        0.399490        0.852970        0.457939
Semidiameter (arcsec)            925.717         944.524        1004.201        2402.133        1125.043        2095.538

HCI longitude                    130.183         190.901         252.328         222.034          33.012         151.859
HCI latitude                      -5.679           1.382           7.028           2.619           3.232          -3.318

Carrington longitude             177.234         237.953         299.379         269.086          80.064         198.910
Carrington rotation number      2312.508        2312.339        2312.168        2312.253        2312.778        2312.447

Heliographic (HEEQ) longitude    -60.719           0.000          61.427          31.133        -157.889         -39.042
Heliographic (HEEQ) latitude      -5.679           1.382           7.028           2.619           3.232          -3.318

HAE longitude                    205.711         266.753         328.231         297.818         108.223         227.446

Earth Ecliptic (HEE) longitude   -61.042          -0.000          61.477          31.065        -158.530         -39.307
Earth Ecliptic (HEE) latitude     -0.128           0.000           0.114          -2.244           7.161           0.113

Roll from ecliptic north          -0.074                          -0.059
Roll from solar north             -4.746                          -2.255

Light travel time to Earth (min)           8.671           8.393                   5.864          15.246           6.009

Separation angle with Earth               61.042          61.477                  31.138         157.421          39.307
Separation angle A with B                        122.520

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: Thursday, 18-Jun-2026 08:01:06 UTC
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