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

Positions of STEREO A and B for 23-Dec-2024 11:00 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)      1.023711        0.983618        0.967175        0.085279        0.950756        0.374224
Semidiameter (arcsec)            937.401         975.611         992.197       11252.800        1009.331        2564.315

HCI longitude                    339.392          15.877          44.477         340.190           5.370          94.377
HCI latitude                       2.747          -1.997          -5.223           1.270           3.500          -3.477

Carrington longitude             152.615         189.100         217.700         153.413         178.593         267.600
Carrington rotation number      2292.576        2292.475        2292.395        2292.574        2292.504        2292.257

Heliographic (HEEQ) longitude    -36.484           0.000          28.601         -35.687         -10.506          78.500
Heliographic (HEEQ) latitude       2.747          -1.997          -5.223           1.270           3.500          -3.477

HAE longitude                     54.984          91.764         120.485          55.951          80.653         170.144

Earth Ecliptic (HEE) longitude   -36.780           0.000          28.720         -35.813         -11.112          78.380
Earth Ecliptic (HEE) latitude      0.184           0.000          -0.125          -1.188           4.152           3.754

Roll from ecliptic north           0.248                           0.227
Roll from solar north              7.034                           5.394

Light travel time to Earth (min)           5.277           4.026                   7.617           1.683           8.147

Separation angle with Earth               36.780          28.721                  35.830          11.853          78.405
Separation angle A with B                         65.501

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: Monday, 23-Dec-2024 11:01:05 UTC
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