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

Positions of STEREO A and B for 5-May-2024 03:00 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)      1.038632        1.008599        0.956980        0.721478        0.638083        0.418738
Semidiameter (arcsec)            923.934         951.446        1002.767        1330.087        1503.924        2291.717

HCI longitude                    133.115         149.218         161.275         246.496         314.000         259.901
HCI latitude                      -5.441          -3.723          -2.286           3.559           7.800           1.572

Carrington longitude               1.847          17.950          30.007         115.228         182.732         128.633
Carrington rotation number      2283.995        2283.950        2283.917        2283.680        2283.492        2283.643

Heliographic (HEEQ) longitude    -16.103           0.000          12.057          97.278         164.782         110.683
Heliographic (HEEQ) latitude      -5.441          -3.723          -2.286           3.559           7.800           1.572

HAE longitude                    208.640         224.781         236.907         322.273          29.311         335.622

Earth Ecliptic (HEE) longitude   -16.141          -0.000          12.125          97.492         164.529         110.841
Earth Ecliptic (HEE) latitude     -0.136           0.000           0.050          -3.095           2.562          -5.568

Roll from ecliptic north          -0.471                          -0.235
Roll from solar north             -5.420                          -7.101

Light travel time to Earth (min)           2.403           1.779                  10.931          13.574          10.158

Separation angle with Earth               16.142          12.125                  97.481         164.323         110.738
Separation angle A with B                         28.267

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: Sunday, 05-May-2024 03:01:05 UTC
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