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Positions of STEREO A and B for 17-Sep-2019 06:00 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)      1.013230        1.005244        0.957337
Semidiameter (arcsec)            947.097         954.622        1002.392

HCI longitude                    359.300         278.098         193.775
HCI latitude                       0.381           7.180           1.841

Carrington longitude             106.264          25.062         300.738
Carrington rotation number      2221.705        2221.930        2222.165

Heliographic (HEEQ) longitude     81.202           0.000         -84.324
Heliographic (HEEQ) latitude       0.381           7.180           1.841

HAE longitude                     75.023         353.800         269.660

Earth Ecliptic (HEE) longitude    81.223           0.000         -84.140
Earth Ecliptic (HEE) latitude      0.292           0.000           0.102

Roll from ecliptic north          -0.044                           0.010
Roll from solar north              7.207                          -7.032

Light travel time to Earth (min)          10.928          10.941

Separation angle with Earth               81.223          84.140
Separation angle A with B                        165.358

Carrington rotation 2221 runs from 2019-08-22 21:23 (DOY 234.89) to
2019-09-19 03:33 (DOY 262.15), as seen from Earth.

Last Revised: Tuesday, 17-Sep-2019 06:01:02 GMT
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