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

Positions of STEREO A and B for 21-Nov-2024 06:00 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)      1.045307        0.987830        0.966813        0.701324        0.823264        0.366856
Semidiameter (arcsec)            918.035         971.450         992.568        1368.309        1165.637        2615.814

HCI longitude                    309.184         343.432          11.352         255.425         339.216         276.148
HCI latitude                       5.757           2.075          -1.540           3.747           6.315           3.523

Carrington longitude             219.263         253.511         281.431         165.504         249.295         186.227
Carrington rotation number      2291.391        2291.296        2291.218        2291.540        2291.308        2291.483

Heliographic (HEEQ) longitude    -34.248          -0.000          27.921         -88.007          -4.216         -67.283
Heliographic (HEEQ) latitude       5.757           2.075          -1.540           3.747           6.315           3.523

HAE longitude                     24.714          59.072          87.220         331.198          54.388         351.915

Earth Ecliptic (HEE) longitude   -34.357           0.000          28.148         -87.873          -4.684         -67.156
Earth Ecliptic (HEE) latitude      0.126           0.000          -0.101          -3.273           3.707          -3.687

Roll from ecliptic north           0.187                           0.189
Roll from solar north              4.761                           7.298

Light travel time to Earth (min)           5.015           3.957                   9.898           1.576           7.576

Separation angle with Earth               34.358          28.149                  87.877           5.970          67.206
Separation angle A with B                         62.506

Carrington rotation 2291 runs from 2024-11-13 04:07 (DOY 318.17) to
2024-12-10 11:40 (DOY 345.49), as seen from Earth.

Last Revised: Thursday, 21-Nov-2024 06:01:06 UTC
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