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

Positions of STEREO A and B for 19-Apr-2024 10:00 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)      1.028031        1.004452        0.958617        0.580750        0.437903        0.530800
Semidiameter (arcsec)            933.462         955.374        1001.055        1652.394        2191.419        1807.889

HCI longitude                    118.280         133.969         144.811         235.250         277.031         216.313
HCI latitude                      -6.488          -5.231          -4.176           3.200           7.301          -0.935

Carrington longitude             209.825         225.514         236.357         326.795           8.577         307.858
Carrington rotation number      2283.417        2283.374        2283.343        2283.092        2282.976        2283.145

Heliographic (HEEQ) longitude    -15.689          -0.000          10.842         101.281         143.062          82.344
Heliographic (HEEQ) latitude      -6.488          -5.231          -4.176           3.200           7.301          -0.935

HAE longitude                    193.849         209.505         220.362         311.031         352.740         291.763

Earth Ecliptic (HEE) longitude   -15.656          -0.000          10.857         101.526         143.235          82.258
Earth Ecliptic (HEE) latitude     -0.095          -0.000           0.016          -2.763           0.104          -5.220

Roll from ecliptic north          -0.341                          -0.083
Roll from solar north             -3.770                          -6.004

Light travel time to Earth (min)           2.311           1.591                  10.452          11.481           8.910

Separation angle with Earth               15.656          10.857                 101.513         143.235          82.291
Separation angle A with B                         26.513

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: Friday, 19-Apr-2024 10:01:06 UTC
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