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

Positions of STEREO A and B for 20-May-2024 08:00 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)      1.049018        1.011931        0.955709        0.738553        0.784625        0.313791
Semidiameter (arcsec)            914.787         948.314        1004.100        1299.335        1223.040        3058.179

HCI longitude                    147.134         163.824         177.220         255.161         333.938         335.332
HCI latitude                      -4.115          -2.027          -0.270           3.742           6.739           3.354

Carrington longitude             160.145         176.835         190.231         268.172         346.949         348.343
Carrington rotation number      2284.555        2284.509        2284.472        2284.255        2284.036        2284.032

Heliographic (HEEQ) longitude    -16.689          -0.000          13.396          91.337         170.114         171.508
Heliographic (HEEQ) latitude      -4.115          -2.027          -0.270           3.742           6.739           3.354

HAE longitude                    222.673         239.466         252.974         330.934          49.120          50.887

Earth Ecliptic (HEE) longitude   -16.794           0.000          13.507          91.468         169.653         171.421
Earth Ecliptic (HEE) latitude     -0.166           0.000           0.080          -3.270           3.519           0.315

Roll from ecliptic north          -0.552                          -0.334
Roll from solar north             -6.638                          -7.577

Light travel time to Earth (min)           2.522           1.980                  10.546          14.876          11.004

Separation angle with Earth               16.795          13.508                  91.466         169.078         171.415
Separation angle A with B                         30.302

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: Monday, 20-May-2024 08:01:11 UTC
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