Positions of STEREO A and B for 23-Mar-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)      0.999901        0.996691        0.956903        0.433632        0.490657        0.464617
Semidiameter (arcsec)            959.722         962.814        1002.848        2212.998        1955.803        2065.417

HCI longitude                     44.552         106.781         160.534         224.553         293.865         160.109
HCI latitude                      -4.966          -6.946          -2.376           2.741          15.893          -3.372

Carrington longitude             244.464         306.693           0.446          64.465         133.778           0.021
Carrington rotation number      2309.321        2309.148        2308.999        2308.821        2309.628        2309.000

Heliographic (HEEQ) longitude    -62.229          -0.000          53.753         117.772        -172.915          53.329
Heliographic (HEEQ) latitude      -4.966          -6.946          -2.376           2.741          15.893          -3.372

HAE longitude                    120.536         182.420         236.161         300.337           8.985         235.622

Earth Ecliptic (HEE) longitude   -61.884          -0.000          53.741         117.917        -173.436          53.202
Earth Ecliptic (HEE) latitude      0.138           0.000           0.049          -2.354           9.244          -0.890

Roll from ecliptic north           0.072                          -0.038
Roll from solar north              5.233                          -6.873

Light travel time to Earth (min)           8.539           7.350                  10.474          12.317           6.729

Separation angle with Earth               61.884          53.741                 117.891         168.679          53.207
Separation angle A with B                        115.625

Carrington rotation 2309 runs from 2026-03-19 08:57 (DOY  78.37) to
2026-04-15 15:50 (DOY 105.66), as seen from Earth.

Last Revised: Monday, 23-Mar-2026 10:01:05 UTC
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