Important notice about STEREO Behind

Positions of STEREO A and B for 17-Jan-2019 07:00 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)      1.044970        0.983710        0.959838
Semidiameter (arcsec)            918.330         975.519         999.781

HCI longitude                    142.900          40.612         301.261
HCI latitude                      -4.650          -4.737           6.245

Carrington longitude              96.082         353.794         254.443
Carrington rotation number      2212.733        2213.017        2213.293

Heliographic (HEEQ) longitude    102.287           0.000         -99.352
Heliographic (HEEQ) latitude      -4.650          -4.737           6.245

HAE longitude                    218.418         116.606          16.820

Earth Ecliptic (HEE) longitude   101.812          -0.000         -99.785
Earth Ecliptic (HEE) latitude     -0.261           0.000           0.038

Roll from ecliptic north          -0.056                          -0.004
Roll from solar north             -5.835                           3.752

Light travel time to Earth (min)          13.099          12.364

Separation angle with Earth              101.812          99.785
Separation angle A with B                        158.402

Carrington rotation 2213 runs from 2019-01-16 19:41 (DOY  16.82) to
2019-02-13 03:53 (DOY  44.16), as seen from Earth.

Last Revised: Thursday, 17-Jan-2019 07:01:03 GMT
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