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Information about STEREO-A close approach to Earth, August 2023

Positions of STEREO A and B for 2-Jul-2024 23:00 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)      1.074178        1.016710        0.954530        0.166041        0.954102        0.555407
Semidiameter (arcsec)            893.360         943.856        1005.341        5779.470        1005.792        1727.792

HCI longitude                    185.744         205.249         223.201         189.880           9.885         149.370
HCI latitude                       0.536           3.110           5.107           0.715           2.921          -3.357

Carrington longitude             299.961         319.466         337.417         304.096         124.101         263.586
Carrington rotation number      2286.167        2286.113        2286.063        2286.155        2285.655        2286.268

Heliographic (HEEQ) longitude    -19.505          -0.000          17.952         -15.369         164.636         -55.879
Heliographic (HEEQ) latitude       0.536           3.110           5.107           0.715           2.921          -3.357

HAE longitude                    261.532         281.193         299.208         265.657          85.209         224.972

Earth Ecliptic (HEE) longitude   -19.662          -0.000          18.015         -15.536         164.016         -56.221
Earth Ecliptic (HEE) latitude     -0.195           0.000           0.125          -0.535           4.143           0.348

Roll from ecliptic north          -0.545                          -0.383
Roll from solar north             -7.761                          -5.663

Light travel time to Earth (min)           3.007           2.617                   7.135          16.222           7.029

Separation angle with Earth               19.663          18.015                  15.545         163.501          56.222
Separation angle A with B                         37.678

Carrington rotation 2286 runs from 2024-06-29 21:30 (DOY 181.90) to
2024-07-27 02:25 (DOY 209.10), as seen from Earth.

Last Revised: Tuesday, 02-Jul-2024 23:01:06 UTC
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