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Positions of STEREO A and B for 21-Aug-2019 20:00 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)      1.029267        1.011650        0.959421
Semidiameter (arcsec)            932.341         948.577        1000.215

HCI longitude                    333.980         252.311         166.190
HCI latitude                       3.477           6.914          -1.679

Carrington longitude              95.649          13.979         287.859
Carrington rotation number      2220.734        2220.961        2221.200

Heliographic (HEEQ) longitude     81.670          -0.000         -86.121
Heliographic (HEEQ) latitude       3.477           6.914          -1.679

HAE longitude                     49.532         328.209         241.856

Earth Ecliptic (HEE) longitude    81.323           0.000         -86.353
Earth Ecliptic (HEE) latitude      0.283          -0.000           0.057

Roll from ecliptic north          -0.041                           0.002
Roll from solar north              6.472                          -7.039

Light travel time to Earth (min)          11.061          11.222

Separation angle with Earth               81.323          86.353
Separation angle A with B                        167.671

Carrington rotation 2220 runs from 2019-07-26 15:55 (DOY 207.66) to
2019-08-22 21:23 (DOY 234.89), as seen from Earth.

Last Revised: Wednesday, 21-Aug-2019 20:01:03 GMT
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