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

Positions of STEREO A and B for 5-Oct-2024 15:00 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)      1.073064        0.999899        0.962969        0.262625        0.312492        0.422803
Semidiameter (arcsec)            894.288         959.724         996.531        3653.989        3070.892        2269.681

HCI longitude                    267.205         296.942         323.318         208.068         224.856         130.238
HCI latitude                       7.237           6.471           4.332           1.863           1.903          -3.879

Carrington longitude             118.632         148.369         174.744          59.494          76.283         341.664
Carrington rotation number      2289.670        2289.588        2289.515        2289.835        2289.788        2290.051

Heliographic (HEEQ) longitude    -29.738           0.000          26.375         -88.875         -72.086        -166.705
Heliographic (HEEQ) latitude       7.237           6.471           4.332           1.863           1.903          -3.879

HAE longitude                    342.993          12.523          38.864         283.851         300.563         205.913

Earth Ecliptic (HEE) longitude   -29.530           0.000          26.341         -88.672         -71.960        -166.610
Earth Ecliptic (HEE) latitude     -0.007           0.000          -0.012          -1.557          -3.215           1.662

Roll from ecliptic north          -0.009                           0.027
Roll from solar north             -0.362                           5.837

Light travel time to Earth (min)           4.433           3.732                   8.549           7.909          11.765

Separation angle with Earth               29.530          26.341                  88.672          71.989         166.509
Separation angle A with B                         55.871

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: Saturday, 05-Oct-2024 15:01:05 UTC
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