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

Positions of STEREO A and B for 18-Dec-2024 22:00 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)      1.026606        0.983896        0.967256        0.272842        0.944052        0.348174
Semidiameter (arcsec)            934.758         975.334         992.113        3517.150        1016.499        2756.170

HCI longitude                    335.070          11.285          39.790         288.568           2.053          73.437
HCI latitude                       3.247          -1.430          -4.783           3.647           3.912          -2.659

Carrington longitude             212.714         248.929         277.434         166.212         239.697         311.081
Carrington rotation number      2292.409        2292.309        2292.229        2292.538        2292.334        2292.136

Heliographic (HEEQ) longitude    -36.215           0.000          28.505         -82.717          -9.232          62.152
Heliographic (HEEQ) latitude       3.247          -1.430          -4.783           3.647           3.912          -2.659

HAE longitude                     50.639          87.140         115.795           4.326          77.308         149.173

Earth Ecliptic (HEE) longitude   -36.501           0.000          28.654         -82.814          -9.832          62.033
Earth Ecliptic (HEE) latitude      0.179           0.000          -0.124          -3.228           4.143           4.293

Roll from ecliptic north           0.244                           0.226
Roll from solar north              6.817                           5.792

Light travel time to Earth (min)           5.248           4.018                   8.215           1.526           7.293

Separation angle with Earth               36.501          28.655                  82.826          10.661          62.119
Separation angle A with B                         65.156

Carrington rotation 2292 runs from 2024-12-10 11:40 (DOY 345.49) to
2025-01-06 19:35 (DOY   6.82), as seen from Earth.

Last Revised: Wednesday, 18-Dec-2024 22:01:06 UTC
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