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

Positions of STEREO A and B for 18-Dec-2024 07:00 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)      1.027011        0.983944        0.967264        0.292720        0.942848        0.344753
Semidiameter (arcsec)            934.389         975.287         992.105        3278.312        1017.796        2783.524

HCI longitude                    334.477          10.654          39.145         286.299           1.592          70.314
HCI latitude                       3.315          -1.351          -4.720           3.694           3.968          -2.503

Carrington longitude             220.986         257.163         285.655         172.808         248.102         316.823
Carrington rotation number      2292.386        2292.286        2292.207        2292.520        2292.311        2292.120

Heliographic (HEEQ) longitude    -36.177          -0.000          28.492         -84.355          -9.061          59.660
Heliographic (HEEQ) latitude       3.315          -1.351          -4.720           3.694           3.968          -2.503

HAE longitude                     50.043          86.504         115.149           2.057          76.844         146.041

Earth Ecliptic (HEE) longitude   -36.461          -0.000          28.645         -84.447          -9.660          59.537
Earth Ecliptic (HEE) latitude      0.178           0.000          -0.124          -3.267           4.140           4.326

Roll from ecliptic north           0.243                           0.225
Roll from solar north              6.784                           5.843

Light travel time to Earth (min)           5.244           4.017                   8.310           1.506           7.174

Separation angle with Earth               36.461          28.645                  84.456          10.502          59.633
Separation angle A with B                         65.106

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: Wednesday, 18-Dec-2024 07:01:07 UTC
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