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

Positions of STEREO A and B for 3-Dec-2023 14:00 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)      1.021643        0.985788        0.967104        0.642630        0.860751        0.590052
Semidiameter (arcsec)            939.299         973.463         992.270        1493.282        1114.873        1626.346

HCI longitude                    342.002         355.076           1.539         264.949         344.672         164.094
HCI latitude                       2.437           0.622          -0.287           3.846           5.821          -2.998

Carrington longitude             228.630         241.705         248.168         151.578         231.300          50.723
Carrington rotation number      2278.365        2278.329        2278.311        2278.579        2278.357        2277.859

Heliographic (HEEQ) longitude    -13.074           0.000           6.463         -90.127         -10.405         169.018
Heliographic (HEEQ) latitude       2.437           0.622          -0.287           3.846           5.821          -2.998

HAE longitude                     57.610          70.803          77.329         340.718          59.845         239.617

Earth Ecliptic (HEE) longitude   -13.193           0.000           6.526         -90.085         -10.958         168.814
Earth Ecliptic (HEE) latitude      0.187          -0.000          -0.087          -3.378           3.869          -0.996

Roll from ecliptic north           0.801                           0.759
Roll from solar north              7.696                           8.008

Light travel time to Earth (min)           1.941           0.938                   9.794           1.867          13.048

Separation angle with Earth               13.194           6.527                  90.085          11.613         168.770
Separation angle A with B                         19.721

Carrington rotation 2278 runs from 2023-11-24 14:35 (DOY 328.61) to
2023-12-21 22:16 (DOY 355.93), as seen from Earth.

Last Revised: Sunday, 03-Dec-2023 14:01:05 UTC
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