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

Positions of STEREO A and B for 6-May-2024 23:00 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)      1.039891        1.009048        0.956808        0.729305        0.658403        0.403391
Semidiameter (arcsec)            922.816         951.023        1002.947        1315.812        1457.509        2378.905

HCI longitude                    134.823         150.987         163.196         247.579         316.903         266.704
HCI latitude                      -5.296          -3.529          -2.049           3.586           7.701           1.921

Carrington longitude             337.550         353.714           5.924          90.306         159.630         109.432
Carrington rotation number      2284.062        2284.017        2283.984        2283.749        2283.557        2283.696

Heliographic (HEEQ) longitude    -16.164           0.000          12.209          96.592         165.916         115.717
Heliographic (HEEQ) latitude      -5.296          -3.529          -2.049           3.586           7.701           1.921

HAE longitude                    210.347         226.557         238.841         323.356          32.187         342.458

Earth Ecliptic (HEE) longitude   -16.211          -0.000          12.284          96.799         165.629         115.901
Earth Ecliptic (HEE) latitude     -0.140           0.000           0.054          -3.121           2.723          -5.319

Roll from ecliptic north          -0.483                          -0.250
Roll from solar north             -5.588                          -7.190

Light travel time to Earth (min)           2.416           1.802                  10.921          13.761          10.305

Separation angle with Earth               16.211          12.284                  96.789         165.379         115.781
Separation angle A with B                         28.495

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: Monday, 06-May-2024 23:01:06 UTC
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