Positions of STEREO A and B for 17-Aug-2026 20:00 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)      1.073637        1.012356        0.962025        0.545424        0.295713        0.324709
Semidiameter (arcsec)            893.810         947.915         997.508        1759.416        3245.129        2955.345

HCI longitude                    184.463         248.643         316.299         266.701         184.842          32.165
HCI latitude                       0.374           6.760           5.025           3.857         -10.771           2.160

Carrington longitude              93.358         157.538         225.194         175.596          93.737         301.060
Carrington rotation number      2314.741        2314.562        2314.374        2314.512        2314.740        2314.164

Heliographic (HEEQ) longitude    -64.180          -0.000          67.655          18.058         -63.801         143.522
Heliographic (HEEQ) latitude       0.374           6.760           5.025           3.857         -10.771           2.160

HAE longitude                    260.240         324.565          31.835         342.469         259.196         107.492

Earth Ecliptic (HEE) longitude   -64.324          -0.000          67.270          17.904         -65.369         142.927
Earth Ecliptic (HEE) latitude     -0.196           0.000           0.003          -3.384         -11.298           6.004

Roll from ecliptic north          -0.094                           0.002
Roll from solar north             -7.324                           5.238

Light travel time to Earth (min)           9.246           9.103                   4.348           7.747          10.690

Separation angle with Earth               64.325          67.270                  18.211          65.877         142.513
Separation angle A with B                        131.594

Carrington rotation 2314 runs from 2026-08-02 12:28 (DOY 214.52) to
2026-08-29 18:07 (DOY 241.75), as seen from Earth.

Last Revised: Monday, 17-Aug-2026 20:01:06 UTC
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