Important notice about STEREO Behind

Positions of STEREO A and B for 20-Mar-2019 17:00 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)      1.080109        0.995815        0.965719
Semidiameter (arcsec)            888.455         963.661         993.692

HCI longitude                    197.970         103.877           6.064
HCI latitude                       1.986          -7.042          -0.865

Carrington longitude             345.809         251.716         153.902
Carrington rotation number      2215.039        2215.301        2215.572

Heliographic (HEEQ) longitude     94.093          -0.000         -97.813
Heliographic (HEEQ) latitude       1.986          -7.042          -0.865

HAE longitude                    273.839         179.536          81.890

Earth Ecliptic (HEE) longitude    94.304          -0.000         -97.646
Earth Ecliptic (HEE) latitude     -0.262          -0.000          -0.092

Roll from ecliptic north          -0.020                           0.013
Roll from solar north             -6.916                           7.224

Light travel time to Earth (min)          12.668          12.281

Separation angle with Earth               94.304          97.646
Separation angle A with B                        168.045

Carrington rotation 2215 runs from 2019-03-12 11:50 (DOY  71.49) to
2019-04-08 18:59 (DOY  98.79), as seen from Earth.

Last Revised: Wednesday, 20-Mar-2019 17:01:04 GMT
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