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

Positions of STEREO A and B for 23-Dec-2024 03:00 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)      1.023920        0.983634        0.967182        0.102395        0.950386        0.372286
Semidiameter (arcsec)            937.209         975.594         992.189        9371.792        1009.724        2577.662

HCI longitude                    339.074          15.539          44.133         329.156           5.128          92.939
HCI latitude                       2.785          -1.956          -5.192           1.945           3.530          -3.435

Carrington longitude             157.025         193.490         222.084         147.108         183.080         270.890
Carrington rotation number      2292.564        2292.463        2292.383        2292.591        2292.491        2292.248

Heliographic (HEEQ) longitude    -36.465           0.000          28.594         -46.383         -10.411          77.400
Heliographic (HEEQ) latitude       2.785          -1.956          -5.192           1.945           3.530          -3.435

HAE longitude                     54.665          91.425         120.140          44.913          80.409         168.706

Earth Ecliptic (HEE) longitude   -36.760          -0.000          28.716         -46.512         -11.016          77.282
Earth Ecliptic (HEE) latitude      0.184           0.000          -0.125          -1.775           4.152           3.808

Roll from ecliptic north           0.248                           0.227
Roll from solar north              7.019                           5.425

Light travel time to Earth (min)           5.275           4.026                   7.620           1.671           8.086

Separation angle with Earth               36.761          28.716                  46.538          11.763          77.310
Separation angle A with B                         65.477

Carrington rotation 2292 runs from 2024-12-10 11:40 (DOY 345.49) to
2025-01-06 19:35 (DOY   6.82), as seen from Earth.

Last Revised: Monday, 23-Dec-2024 03:01:06 UTC
Responsible NASA Official:
Accessibility
Privacy Policy and Important Notices
Feedback and comments: webmaster