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

Positions of STEREO A and B for 21-Nov-2024 11:00 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)      1.045164        0.987790        0.966823        0.700167        0.824713        0.365626
Semidiameter (arcsec)            918.160         971.490         992.558        1370.570        1163.590        2624.617

HCI longitude                    309.376         343.641          11.566         255.548         339.419         277.081
HCI latitude                       5.742           2.049          -1.567           3.749           6.298           3.549

Carrington longitude             216.500         250.765         278.690         162.672         246.543         184.205
Carrington rotation number      2291.399        2291.303        2291.226        2291.548        2291.315        2291.488

Heliographic (HEEQ) longitude    -34.265           0.000          27.925         -88.093          -4.222         -66.559
Heliographic (HEEQ) latitude       5.742           2.049          -1.567           3.749           6.298           3.549

HAE longitude                     24.906          59.282          87.436         331.321          54.591         352.848

Earth Ecliptic (HEE) longitude   -34.376          -0.000          28.153         -87.961          -4.692         -66.434
Earth Ecliptic (HEE) latitude      0.126           0.000          -0.101          -3.275           3.713          -3.648

Roll from ecliptic north           0.187                           0.189
Roll from solar north              4.780                           7.293

Light travel time to Earth (min)           5.017           3.958                   9.900           1.566           7.537

Separation angle with Earth               34.376          28.154                  87.964           5.981          66.485
Separation angle A with B                         62.530

Carrington rotation 2291 runs from 2024-11-13 04:07 (DOY 318.17) to
2024-12-10 11:40 (DOY 345.49), as seen from Earth.

Last Revised: Thursday, 21-Nov-2024 11:01:06 UTC
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