Positions of STEREO A and B for 9-Jul-2026 19:00 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)      1.051241        1.016622        0.957537        0.691611        0.715492        0.453604
Semidiameter (arcsec)            912.852         943.938        1002.183        1387.526        1341.214        2115.563

HCI longitude                    149.960         211.247         275.164         242.220          54.681         211.945
HCI latitude                      -3.814           3.779           7.307           3.437          -3.283          -2.164

Carrington longitude             252.638         313.925          17.842         344.897         157.359         314.623
Carrington rotation number      2313.298        2313.128        2312.950        2313.042        2313.563        2313.126

Heliographic (HEEQ) longitude    -61.287          -0.000          63.917          30.973        -156.566           0.698
Heliographic (HEEQ) latitude      -3.814           3.779           7.307           3.437          -3.283          -2.164

HAE longitude                    225.508         287.218         350.888         317.999         130.470         287.271

Earth Ecliptic (HEE) longitude   -61.710          -0.000          63.670          30.781        -156.747           0.054
Earth Ecliptic (HEE) latitude     -0.171           0.000           0.084          -2.983           2.640          -5.984

Roll from ecliptic north          -0.094                          -0.038
Roll from solar north             -6.368                           0.613

Light travel time to Earth (min)           8.824           8.671                   4.596          14.116           4.720

Separation angle with Earth               61.710          63.670                  30.912         156.606           5.984
Separation angle A with B                        125.380

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, 09-Jul-2026 19:01:07 UTC
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