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

Positions of STEREO A and B for 19-Apr-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)      1.028387        1.004598        0.958556        0.588117        0.445287        0.527808
Semidiameter (arcsec)            933.139         955.235        1001.118        1631.695        2155.076        1818.138

HCI longitude                    118.798         134.498         145.379         235.742         278.876         217.525
HCI latitude                      -6.458          -5.184          -4.116           3.219           7.402          -0.866

Carrington longitude             202.660         218.360         229.241         319.605           2.738         301.387
Carrington rotation number      2283.437        2283.393        2283.363        2283.112        2282.992        2283.163

Heliographic (HEEQ) longitude    -15.700           0.000          10.881         101.245         144.378          83.027
Heliographic (HEEQ) latitude      -6.458          -5.184          -4.116           3.219           7.402          -0.866

HAE longitude                    194.364         210.034         220.932         311.524         354.567         292.981

Earth Ecliptic (HEE) longitude   -15.670           0.000          10.898         101.490         144.534          82.947
Earth Ecliptic (HEE) latitude     -0.096           0.000           0.017          -2.780           0.236          -5.274

Roll from ecliptic north          -0.346                          -0.089
Roll from solar north             -3.832                          -6.052

Light travel time to Earth (min)           2.313           1.597                  10.488          11.573           8.951

Separation angle with Earth               15.670          10.898                 101.476         144.533          82.977
Separation angle A with B                         26.568

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: Friday, 19-Apr-2024 23:01:06 UTC
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