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

Positions of STEREO A and B for 25-Apr-2024 05:00 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)      1.031881        1.006010        0.957983        0.649315        0.516110        0.495180
Semidiameter (arcsec)            929.979         953.895        1001.717        1477.907        1859.346        1937.937

HCI longitude                    123.792         139.612         150.882         239.996         294.059         230.092
HCI latitude                      -6.146          -4.711          -3.512           3.367           7.934          -0.135

Carrington longitude             133.186         149.006         160.276         249.390         303.453         239.486
Carrington rotation number      2283.630        2283.586        2283.555        2283.307        2283.157        2283.335

Heliographic (HEEQ) longitude    -15.820           0.000          11.270         100.383         154.447          90.479
Heliographic (HEEQ) latitude      -6.146          -4.711          -3.512           3.367           7.934          -0.135

HAE longitude                    199.338         215.151         226.456         315.776           9.587         305.620

Earth Ecliptic (HEE) longitude   -15.813           0.000          11.304         100.625         154.436          90.469
Earth Ecliptic (HEE) latitude     -0.111          -0.000           0.028          -2.917           1.305          -5.694

Roll from ecliptic north          -0.395                          -0.144
Roll from solar north             -4.420                          -6.475

Light travel time to Earth (min)           2.341           1.657                  10.762          12.378           9.356

Separation angle with Earth               15.814          11.304                 100.611         154.405          90.467
Separation angle A with B                         27.118

Carrington rotation 2283 runs from 2024-04-09 05:32 (DOY 100.23) to
2024-05-06 11:35 (DOY 127.48), as seen from Earth.

Last Revised: Thursday, 25-Apr-2024 05:01:06 UTC
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