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

Positions of STEREO A and B for 15-Oct-2024 12:00 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)      1.068182        0.997018        0.964021        0.501242        0.428686        0.458420
Semidiameter (arcsec)            898.375         962.498         995.443        1914.501        2238.531        2093.340

HCI longitude                    275.935         306.739         333.555         229.907         274.642         160.545
HCI latitude                       7.236           5.821           3.206           2.986           7.165          -2.980

Carrington longitude             347.291          18.094          44.911         301.263         345.998         231.900
Carrington rotation number      2290.035        2289.950        2289.875        2290.163        2290.039        2290.356

Heliographic (HEEQ) longitude    -30.804           0.000          26.816         -76.832         -32.097        -146.194
Heliographic (HEEQ) latitude       7.236           5.821           3.206           2.986           7.165          -2.980

HAE longitude                    351.654          22.284          49.141         305.690         350.371         236.100

Earth Ecliptic (HEE) longitude   -30.631           0.000          26.857         -76.594         -31.913        -146.185
Earth Ecliptic (HEE) latitude      0.023           0.000          -0.034          -2.568          -0.063          -0.552

Roll from ecliptic north           0.042                           0.070
Roll from solar north              0.790                           6.559

Light travel time to Earth (min)           4.573           3.797                   8.374           5.593          11.655

Separation angle with Earth               30.631          26.857                  76.608          31.913         146.181
Separation angle A with B                         57.487

Carrington rotation 2289 runs from 2024-09-19 14:07 (DOY 263.59) to
2024-10-16 20:55 (DOY 290.87), as seen from Earth.

Last Revised: Tuesday, 15-Oct-2024 12:01:06 UTC
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