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

Positions of STEREO A and B for 24-Jan-2025 07:00 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)      1.007023        0.984424        0.965460        0.686256        0.897159        0.445877
Semidiameter (arcsec)            952.936         974.811         993.959        1398.353        1069.630        2152.224

HCI longitude                     10.246          48.197          77.544         241.698          29.023         196.594
HCI latitude                      -1.106          -5.421          -7.192           3.421           0.301          -2.770

Carrington longitude              91.932         129.883         159.230         323.385         110.709         278.281
Carrington rotation number      2293.745        2293.639        2293.558        2294.102        2293.692        2293.227

Heliographic (HEEQ) longitude    -37.951           0.000          29.347        -166.499         -19.174         148.398
Heliographic (HEEQ) latitude      -1.106          -5.421          -7.192           3.421           0.301          -2.770

HAE longitude                     86.068         124.191         153.409         317.478         104.561         271.898

Earth Ecliptic (HEE) longitude   -38.123          -0.000          29.217        -166.714         -19.631         147.707
Earth Ecliptic (HEE) latitude      0.192          -0.000          -0.109          -2.968           3.813          -4.818

Roll from ecliptic north           0.245                           0.191
Roll from solar north              7.381                           1.751

Light travel time to Earth (min)           5.412           4.093                  13.801           2.808          11.487

Separation angle with Earth               38.123          29.218                 166.392          19.983         147.388
Separation angle A with B                         67.341

Carrington rotation 2293 runs from 2025-01-06 19:35 (DOY   6.82) to
2025-02-03 03:45 (DOY  34.16), as seen from Earth.

Last Revised: Friday, 24-Jan-2025 07:01:15 UTC
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