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

Positions of STEREO A and B for 27-Apr-2024 10:00 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)      1.033371        1.006600        0.957749        0.669995        0.544893        0.479615
Semidiameter (arcsec)            928.638         953.336        1001.961        1432.291        1761.130        2000.829

HCI longitude                    125.881         141.757         153.197         241.573         299.288         235.918
HCI latitude                      -6.002          -4.501          -3.248           3.418           7.991           0.208

Carrington longitude             103.951         119.827         131.267         219.643         277.358         213.989
Carrington rotation number      2283.711        2283.667        2283.635        2283.390        2283.230        2283.406

Heliographic (HEEQ) longitude    -15.877           0.000          11.439          99.816         157.530          94.161
Heliographic (HEEQ) latitude      -6.002          -4.501          -3.248           3.418           7.991           0.208

HAE longitude                    201.420         217.299         228.781         317.353          14.755         311.485

Earth Ecliptic (HEE) longitude   -15.880           0.000          11.482         100.053         157.456          94.186
Earth Ecliptic (HEE) latitude     -0.117           0.000           0.033          -2.964           1.656          -5.796

Roll from ecliptic north          -0.413                          -0.166
Roll from solar north             -4.656                          -6.635

Light travel time to Earth (min)           2.354           1.684                  10.836          12.676           9.532

Separation angle with Earth               15.880          11.482                 100.040         157.398          94.165
Separation angle A with B                         27.362

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 10:01:06 UTC
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