Important notice about STEREO Behind

Positions of STEREO A and B for 19-Apr-2019 19:00 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)      1.086078        1.004368        0.967221
Semidiameter (arcsec)            883.571         955.454         992.149

HCI longitude                    223.615         133.638          37.013
HCI latitude                       4.840          -5.260          -4.506

Carrington longitude             304.740         214.763         118.138
Carrington rotation number      2216.154        2216.403        2216.672

Heliographic (HEEQ) longitude     89.976           0.000         -96.626
Heliographic (HEEQ) latitude       4.840          -5.260          -4.506

HAE longitude                    299.594         209.175         113.013

Earth Ecliptic (HEE) longitude    90.420          -0.000         -96.162
Earth Ecliptic (HEE) latitude     -0.177           0.000          -0.122

Roll from ecliptic north          -0.000                           0.012
Roll from solar north             -5.244                           5.797

Light travel time to Earth (min)          12.349          12.204

Separation angle with Earth               90.420          96.162
Separation angle A with B                        173.412

Carrington rotation 2216 runs from 2019-04-08 18:59 (DOY  98.79) to
2019-05-06 01:04 (DOY 126.04), as seen from Earth.

Last Revised: Friday, 19-Apr-2019 19:01:05 GMT
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