Important notice about STEREO Behind

Positions of STEREO A and B for 19-Sep-2018 11:00 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 orbit simulations
• Java orbit viewer (NRL)
• Satellite Situation Center (SSCWeb)
• HelioWeb
• Attitude and orbit text files (CalTech)
• Early orbit summary
• Connections with planetary missions
• Explanation of coordinate systems

                                STEREO-B           Earth        STEREO-A

Heliocentric distance (AU)      1.002704        1.004552        0.958714
Semidiameter (arcsec)            957.040         955.279        1000.954

HCI longitude                     25.120         280.526         174.696
HCI latitude                      -2.849           7.131          -0.597

Carrington longitude             238.066         133.472          27.642
Carrington rotation number      2208.339        2208.629        2208.923

Heliographic (HEEQ) longitude    104.594          -0.000        -105.830
Heliographic (HEEQ) latitude      -2.849           7.131          -0.597

HAE longitude                    101.035         356.210         250.429

Earth Ecliptic (HEE) longitude   104.826           0.000        -105.781
Earth Ecliptic (HEE) latitude      0.243          -0.000           0.073

Roll from ecliptic north           0.064                          -0.021
Roll from solar north              6.626                          -7.242

Light travel time to Earth (min)          13.229          13.024

Separation angle with Earth              104.826         105.781
Separation angle A with B                        149.392

Carrington rotation 2208 runs from 2018-09-02 07:16 (DOY 245.30) to
2018-09-29 13:42 (DOY 272.57), as seen from Earth.

Last Revised: Wednesday, 19-Sep-2018 11:01:18 GMT
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