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

Positions of STEREO A and B for 21-Nov-2024 10:00 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)      1.045193        0.987798        0.966821        0.700400        0.824424        0.365872
Semidiameter (arcsec)            918.135         971.482         992.560        1370.114        1163.998        2622.852

HCI longitude                    309.337         343.599          11.523         255.523         339.379         276.894
HCI latitude                       5.745           2.055          -1.562           3.749           6.301           3.544

Carrington longitude             217.052         251.314         279.238         163.238         247.094         184.609
Carrington rotation number      2291.397        2291.302        2291.224        2291.547        2291.314        2291.487

Heliographic (HEEQ) longitude    -34.262           0.000          27.924         -88.076          -4.220         -66.705
Heliographic (HEEQ) latitude       5.745           2.055          -1.562           3.749           6.301           3.544

HAE longitude                     24.868          59.240          87.393         331.297          54.550         352.661

Earth Ecliptic (HEE) longitude   -34.372           0.000          28.152         -87.943          -4.690         -66.579
Earth Ecliptic (HEE) latitude      0.126           0.000          -0.101          -3.275           3.712          -3.656

Roll from ecliptic north           0.187                           0.189
Roll from solar north              4.777                           7.294

Light travel time to Earth (min)           5.017           3.958                   9.900           1.568           7.545

Separation angle with Earth               34.373          28.153                  87.947           5.978          66.630
Separation angle A with B                         62.525

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 10:01:06 UTC
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