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

Positions of STEREO A and B for 27-Apr-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)      1.033399        1.006611        0.957745        0.670358        0.545428        0.479312
Semidiameter (arcsec)            928.613         953.325        1001.966        1431.514        1759.402        2002.095

HCI longitude                    125.920         141.798         153.240         241.602         299.381         236.032
HCI latitude                      -5.999          -4.497          -3.243           3.419           7.991           0.215

Carrington longitude             103.399         119.277         130.719         219.081         276.860         213.511
Carrington rotation number      2283.713        2283.669        2283.637        2283.391        2283.231        2283.407

Heliographic (HEEQ) longitude    -15.878           0.000          11.443          99.804         157.583          94.234
Heliographic (HEEQ) latitude      -5.999          -4.497          -3.243           3.419           7.991           0.215

HAE longitude                    201.459         217.340         228.825         317.381          14.847         311.600

Earth Ecliptic (HEE) longitude   -15.881           0.000          11.485         100.042         157.507          94.260
Earth Ecliptic (HEE) latitude     -0.117           0.000           0.033          -2.965           1.662          -5.797

Roll from ecliptic north          -0.414                          -0.166
Roll from solar north             -4.661                          -6.638

Light travel time to Earth (min)           2.354           1.684                  10.837          12.682           9.535

Separation angle with Earth               15.881          11.485                 100.028         157.449          94.238
Separation angle A with B                         27.366

Carrington rotation 2283 runs from 2024-04-09 05:32 (DOY 100.23) to
2024-05-06 11:35 (DOY 127.48), as seen from Earth.

Last Revised: Saturday, 27-Apr-2024 11:01:06 UTC
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