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

Positions of STEREO A and B for 2-Jun-2024 04:00 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)      1.057415        1.014208        0.954952        0.667107        0.871031        0.347277
Semidiameter (arcsec)            907.522         946.184        1004.896        1438.491        1101.714        2763.293

HCI longitude                    158.715         176.051         190.697         263.110         346.268          54.391
HCI latitude                      -2.827          -0.499           1.458           3.835           5.665          -0.100

Carrington longitude             349.692           7.028          21.675          94.087         177.246         245.369
Carrington rotation number      2285.029        2284.980        2284.940        2284.739        2284.508        2285.318

Heliographic (HEEQ) longitude    -17.336           0.000          14.646          87.059         170.217        -121.660
Heliographic (HEEQ) latitude      -2.827          -0.499           1.458           3.835           5.665          -0.100

HAE longitude                    234.303         251.785         266.560         338.879          61.444         129.946

Earth Ecliptic (HEE) longitude   -17.482           0.000          14.775          87.094         169.659        -121.839
Earth Ecliptic (HEE) latitude     -0.184           0.000           0.100          -3.365           3.908           5.793

Roll from ecliptic north          -0.585                          -0.381
Roll from solar north             -7.339                          -7.506

Light travel time to Earth (min)           2.643           2.162                   9.859          15.608          10.251

Separation angle with Earth               17.483          14.775                  87.099         168.953         121.657
Separation angle A with B                         32.258

Carrington rotation 2284 runs from 2024-05-06 11:35 (DOY 127.48) to
2024-06-02 16:44 (DOY 154.70), as seen from Earth.

Last Revised: Sunday, 02-Jun-2024 04:01:06 UTC
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