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

Positions of STEREO A and B for 14-Sep-2024 01:00 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)      1.080976        1.005908        0.960477        0.516969        0.457703        0.311566
Semidiameter (arcsec)            887.742         953.992         999.116        1856.259        2096.618        3080.018

HCI longitude                    248.378         275.657         300.759         273.487          97.157          29.943
HCI latitude                       6.679           7.217           6.276           3.847          -7.314          -0.032

Carrington longitude              45.951          73.230          98.332          71.061         254.730         187.516
Carrington rotation number      2288.872        2288.797        2288.727        2288.803        2289.292        2288.479

Heliographic (HEEQ) longitude    -27.279          -0.000          25.102          -2.169        -178.500         114.286
Heliographic (HEEQ) latitude       6.679           7.217           6.276           3.847          -7.314          -0.032

HAE longitude                    324.298         351.378          16.320         349.252         172.864         105.514

Earth Ecliptic (HEE) longitude   -27.080          -0.000          24.943          -2.126        -178.513         114.136
Earth Ecliptic (HEE) latitude     -0.069           0.000           0.036          -3.392          -0.118           3.583

Roll from ecliptic north          -0.133                          -0.075
Roll from solar north             -2.799                           3.626

Light travel time to Earth (min)           4.109           3.551                   4.088          12.172           9.716

Separation angle with Earth               27.080          24.943                   4.003         178.509         114.086
Separation angle A with B                         52.023

Carrington rotation 2288 runs from 2024-08-23 07:55 (DOY 236.33) to
2024-09-19 14:07 (DOY 263.59), as seen from Earth.

Last Revised: Saturday, 14-Sep-2024 01:01:07 UTC
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