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

Positions of STEREO A and B for 27-Jul-2024 04:00 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)      1.082229        1.015520        0.955613        0.658069        0.903045        0.563898
Semidiameter (arcsec)            886.714         944.962        1004.202        1458.248        1062.658        1701.776

HCI longitude                    206.520         228.294         248.929         240.649          27.922         195.535
HCI latitude                       3.080           5.429           6.890           3.389           0.457          -2.030

Carrington longitude             337.356         359.130          19.764          11.485         158.758         326.371
Carrington rotation number      2287.063        2287.002        2286.945        2286.968        2286.559        2287.093

Heliographic (HEEQ) longitude    -21.774          -0.000          20.635          12.355         159.628         -32.759
Heliographic (HEEQ) latitude       3.080           5.429           6.890           3.389           0.457          -2.030

HAE longitude                    282.451         304.288         324.854         316.429         103.447         270.935

Earth Ecliptic (HEE) longitude   -21.838          -0.000          20.565          12.141         159.158         -33.353
Earth Ecliptic (HEE) latitude     -0.174           0.000           0.117          -2.937           3.846          -3.955

Roll from ecliptic north          -0.433                          -0.308
Roll from solar north             -6.919                          -2.909

Light travel time to Earth (min)           3.350           2.967                   3.320          15.686           5.227

Separation angle with Earth               21.838          20.566                  12.486         158.822          33.560
Separation angle A with B                         42.404

Carrington rotation 2287 runs from 2024-07-27 02:25 (DOY 209.10) to
2024-08-23 07:55 (DOY 236.33), as seen from Earth.

Last Revised: Saturday, 27-Jul-2024 04:01:06 UTC
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