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

Positions of STEREO A and B for 3-Dec-2024 09:00 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)      1.037002        0.985739        0.967204        0.592553        0.893571        0.310529
Semidiameter (arcsec)            925.387         973.511         992.167        1619.479        1073.924        3090.296

HCI longitude                    320.435         355.616          23.797         263.704         350.035         341.619
HCI latitude                       4.785           0.554          -3.058           3.842           5.282           2.875

Carrington longitude              58.528          93.709         121.890           1.797          88.128          79.712
Carrington rotation number      2291.837        2291.740        2291.661        2291.995        2291.755        2291.779

Heliographic (HEEQ) longitude    -35.181          -0.000          28.181         -91.913          -5.581         -13.997
Heliographic (HEEQ) latitude       4.785           0.554          -3.058           3.842           5.282           2.875

HAE longitude                     35.960          71.347          99.747         339.473          65.221          57.177

Earth Ecliptic (HEE) longitude   -35.387          -0.000          28.400         -91.874          -6.126         -14.170
Earth Ecliptic (HEE) latitude      0.152           0.000          -0.115          -3.367           3.992           0.576

Roll from ecliptic north           0.217                           0.212
Roll from solar north              5.801                           6.844

Light travel time to Earth (min)           5.129           3.987                   9.703           1.256           5.730

Separation angle with Earth               35.387          28.400                  91.871           7.308          14.181
Separation angle A with B                         63.787

Carrington rotation 2291 runs from 2024-11-13 04:07 (DOY 318.17) to
2024-12-10 11:40 (DOY 345.49), as seen from Earth.

Last Revised: Tuesday, 03-Dec-2024 09:01:05 UTC
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