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

Positions of STEREO A and B for 26-Jul-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)      1.082183        1.015540        0.955599        0.656081        0.903928        0.564497
Semidiameter (arcsec)            886.752         944.943        1004.216        1462.666        1061.619        1699.970

HCI longitude                    206.342         228.095         248.707         240.499          27.755         195.126
HCI latitude                       3.059           5.412           6.880           3.384           0.480          -2.049

Carrington longitude             340.133           1.886          22.498          14.290         161.546         328.917
Carrington rotation number      2287.055        2286.995        2286.938        2286.960        2286.551        2287.086

Heliographic (HEEQ) longitude    -21.753           0.000          20.612          12.404         159.661         -32.969
Heliographic (HEEQ) latitude       3.059           5.412           6.880           3.384           0.480          -2.049

HAE longitude                    282.272         304.089         324.633         316.279         103.278         270.526

Earth Ecliptic (HEE) longitude   -21.818          -0.000          20.544          12.190         159.189         -33.563
Earth Ecliptic (HEE) latitude     -0.174           0.000           0.117          -2.932           3.850          -3.924

Roll from ecliptic north          -0.434                          -0.309
Roll from solar north             -6.930                          -2.936

Light travel time to Earth (min)           3.347           2.964                   3.337          15.695           5.239

Separation angle with Earth               21.818          20.544                  12.532         158.851          33.765
Separation angle A with B                         42.362

Carrington rotation 2286 runs from 2024-06-29 21:30 (DOY 181.90) to
2024-07-27 02:25 (DOY 209.10), as seen from Earth.

Last Revised: Friday, 26-Jul-2024 23:01:05 UTC
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