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

Positions of STEREO A and B for 19-Apr-2024 17:00 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)      1.028222        1.004531        0.958584        0.584743        0.441878        0.529198
Semidiameter (arcsec)            933.288         955.299        1001.089        1641.110        2171.702        1813.362

HCI longitude                    118.559         134.254         145.117         235.517         278.032         216.964
HCI latitude                      -6.472          -5.206          -4.144           3.210           7.357          -0.898

Carrington longitude             205.967         221.662         232.525         322.925           5.440         304.372
Carrington rotation number      2283.428        2283.384        2283.354        2283.103        2282.985        2283.155

Heliographic (HEEQ) longitude    -15.695           0.000          10.863         101.263         143.778          82.710
Heliographic (HEEQ) latitude      -6.472          -5.206          -4.144           3.210           7.357          -0.898

HAE longitude                    194.126         209.790         220.669         311.298         353.732         292.417

Earth Ecliptic (HEE) longitude   -15.664           0.000          10.879         101.508         143.942          82.628
Earth Ecliptic (HEE) latitude     -0.096           0.000           0.016          -2.772           0.176          -5.249

Roll from ecliptic north          -0.344                          -0.086
Roll from solar north             -3.803                          -6.030

Light travel time to Earth (min)           2.312           1.594                  10.472          11.531           8.932

Separation angle with Earth               15.664          10.879                 101.495         143.941          82.659
Separation angle A with B                         26.543

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, 19-Apr-2024 17:01:10 UTC
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