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

Positions of STEREO A and B for 24-Dec-2024 03:00 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)      1.023294        0.983586        0.967159        0.053498        0.951439        0.378091
Semidiameter (arcsec)            937.783         975.642         992.212       17937.610        1008.606        2538.085

HCI longitude                    340.028          16.551          45.166          23.409           5.853          97.208
HCI latitude                       2.672          -2.079          -5.285          -1.575           3.439          -3.554

Carrington longitude             143.795         180.318         208.933         187.175         169.620         260.974
Carrington rotation number      2292.601        2292.499        2292.420        2292.480        2292.529        2292.275

Heliographic (HEEQ) longitude    -36.523           0.000          28.615           6.858         -10.698          80.657
Heliographic (HEEQ) latitude       2.672          -2.079          -5.285          -1.575           3.439          -3.554

HAE longitude                     55.624          92.443         121.173          99.190          81.140         172.974

Earth Ecliptic (HEE) longitude   -36.819           0.000          28.730           6.747         -11.303          80.531
Earth Ecliptic (HEE) latitude      0.185          -0.000          -0.125           1.313           4.152           3.641

Roll from ecliptic north           0.249                           0.227
Roll from solar north              7.062                           5.333

Light travel time to Earth (min)           5.281           4.028                   7.739           1.708           8.268

Separation angle with Earth               36.820          28.730                   6.873          12.033          80.550
Separation angle A with B                         65.550

Carrington rotation 2292 runs from 2024-12-10 11:40 (DOY 345.49) to
2025-01-06 19:35 (DOY   6.82), as seen from Earth.

Last Revised: Tuesday, 24-Dec-2024 03:01:07 UTC
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