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

Positions of STEREO A and B for 3-May-2024 05:00 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)      1.037318        1.008116        0.957164        0.711531        0.616061        0.434590
Semidiameter (arcsec)            925.105         951.903        1002.574        1348.679        1557.683        2208.124

HCI longitude                    131.325         147.367         159.266         245.335         310.756         253.300
HCI latitude                      -5.588          -3.923          -2.530           3.528           7.886           1.213

Carrington longitude              27.243          43.285          55.185         141.254         206.674         149.219
Carrington rotation number      2283.924        2283.880        2283.847        2283.608        2283.426        2283.586

Heliographic (HEEQ) longitude    -16.042          -0.000          11.900          97.968         163.389         105.934
Heliographic (HEEQ) latitude      -5.588          -3.923          -2.530           3.528           7.886           1.213

HAE longitude                    206.852         222.923         234.885         321.113          26.098         328.983

Earth Ecliptic (HEE) longitude   -16.072          -0.000          11.962          98.190         163.174         106.060
Earth Ecliptic (HEE) latitude     -0.131           0.000           0.046          -3.066           2.374          -5.734

Roll from ecliptic north          -0.458                          -0.219
Roll from solar north             -5.239                          -6.999

Light travel time to Earth (min)           2.390           1.755                  10.929          13.369          10.003

Separation angle with Earth               16.072          11.962                  98.178         163.012         105.978
Separation angle A with B                         28.034

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, 03-May-2024 05:01:07 UTC
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