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Positions of STEREO A and B for 1-Jun-2023 12:00 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)      1.068468        1.013938        0.959984        0.583591        0.826932        0.471098
Semidiameter (arcsec)            898.134         946.436         999.629        1644.351        1160.467        2037.003

HCI longitude                    177.914         174.716         167.685         268.744         339.731         234.910
HCI latitude                      -0.459          -0.668          -1.491           3.861           6.271          -0.948

Carrington longitude             169.838         166.640         159.610         260.668         331.656         226.834
Carrington rotation number      2271.528        2271.537        2271.557        2271.276        2271.079        2271.370

Heliographic (HEEQ) longitude      3.198           0.000          -7.031          94.028         165.015          60.194
Heliographic (HEEQ) latitude      -0.459          -0.668          -1.491           3.861           6.271          -0.948

HAE longitude                    253.638         250.440         243.363         344.510          54.903         310.389

Earth Ecliptic (HEE) longitude     3.199          -0.000          -7.077          94.071         164.463          59.950
Earth Ecliptic (HEE) latitude     -0.195           0.000           0.061          -3.390           3.723          -6.876

Roll from ecliptic north           3.491                           0.487
Roll from solar north             -3.756                          -6.597

Light travel time to Earth (min)           0.663           1.108                  10.024          15.164           7.322

Separation angle with Earth                3.205           7.077                  94.064         164.034          60.188
Separation angle A with B                         10.279

Carrington rotation 2271 runs from 2023-05-17 21:14 (DOY 137.88) to
2023-06-14 02:10 (DOY 165.09), as seen from Earth.

Last Revised: Thursday, 01-Jun-2023 12:01:07 UTC
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