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

Positions of STEREO A and B for 7-May-2024 00:00 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)      1.039919        1.009058        0.956804        0.729464        0.658856        0.403041
Semidiameter (arcsec)            922.791         951.013        1002.951        1315.525        1456.506        2380.967

HCI longitude                    134.862         151.027         163.240         247.603         316.967         266.865
HCI latitude                      -5.292          -3.525          -2.044           3.587           7.699           1.929

Carrington longitude             336.998         353.163           5.376          89.740         159.103         109.001
Carrington rotation number      2284.064        2284.019        2283.985        2283.751        2283.558        2283.697

Heliographic (HEEQ) longitude    -16.165          -0.000          12.213          96.576         165.940         115.838
Heliographic (HEEQ) latitude      -5.292          -3.525          -2.044           3.587           7.699           1.929

HAE longitude                    210.385         226.598         238.885         323.380          32.250         342.619

Earth Ecliptic (HEE) longitude   -16.213           0.000          12.288          96.783         165.652         116.022
Earth Ecliptic (HEE) latitude     -0.140           0.000           0.054          -3.121           2.726          -5.312

Roll from ecliptic north          -0.483                          -0.250
Roll from solar north             -5.592                          -7.192

Light travel time to Earth (min)           2.417           1.802                  10.920          13.765          10.308

Separation angle with Earth               16.213          12.288                  96.773         165.401         115.902
Separation angle A with B                         28.501

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: Tuesday, 07-May-2024 00:01:07 UTC
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