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

Positions of STEREO A and B for 26-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)      1.033061        1.006478        0.957797        0.665933        0.538986        0.482928
Semidiameter (arcsec)            928.917         953.451        1001.911        1441.027        1780.432        1987.103

HCI longitude                    125.448         141.312         152.716         241.254         298.248         234.678
HCI latitude                      -6.032          -4.545          -3.303           3.408           7.985           0.135

Carrington longitude             110.019         125.884         137.288         225.825         282.819         219.249
Carrington rotation number      2283.694        2283.650        2283.619        2283.373        2283.214        2283.391

Heliographic (HEEQ) longitude    -15.865          -0.000          11.404          99.941         156.936          93.366
Heliographic (HEEQ) latitude      -6.032          -4.545          -3.303           3.408           7.985           0.135

HAE longitude                    200.988         216.854         228.298         317.033          13.728         310.236

Earth Ecliptic (HEE) longitude   -15.866          -0.000          11.445         100.180         156.874          93.383
Earth Ecliptic (HEE) latitude     -0.116          -0.000           0.032          -2.954           1.587          -5.779

Roll from ecliptic north          -0.410                          -0.161
Roll from solar north             -4.608                          -6.603

Light travel time to Earth (min)           2.351           1.678                  10.822          12.616           9.495

Separation angle with Earth               15.866          11.445                 100.166         156.822          93.366
Separation angle A with B                         27.311

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, 26-Apr-2024 23:01:05 UTC
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