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

Positions of STEREO A and B for 9-May-2024 16:00 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)      1.041751        1.009686        0.956563        0.737918        0.687079        0.380851
Semidiameter (arcsec)            921.168         950.422        1003.204        1300.453        1396.677        2519.692

HCI longitude                    137.337         153.596         166.035         249.143         320.882         277.761
HCI latitude                      -5.073          -3.236          -1.696           3.623           7.534           2.430

Carrington longitude             301.648         317.907         330.346          53.454         125.193          82.072
Carrington rotation number      2284.162        2284.117        2284.082        2283.852        2283.652        2283.772

Heliographic (HEEQ) longitude    -16.259          -0.000          12.439          95.547         167.286         124.165
Heliographic (HEEQ) latitude      -5.073          -3.236          -1.696           3.623           7.534           2.430

HAE longitude                    212.860         229.178         241.700         324.920          36.134         353.546

Earth Ecliptic (HEE) longitude   -16.318          -0.000          12.522          95.742         166.955         124.368
Earth Ecliptic (HEE) latitude     -0.146          -0.000           0.060          -3.156           2.932          -4.755

Roll from ecliptic north          -0.499                          -0.270
Roll from solar north             -5.826                          -7.307

Light travel time to Earth (min)           2.436           1.837                  10.885          14.020          10.511

Separation angle with Earth               16.319          12.522                  95.733         166.635         124.234
Separation angle A with B                         28.841

Carrington rotation 2284 runs from 2024-05-06 11:35 (DOY 127.48) to
2024-06-02 16:44 (DOY 154.70), as seen from Earth.

Last Revised: Thursday, 09-May-2024 16:01:08 UTC
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