Important notice about STEREO Behind

Positions of STEREO A and B for 21-May-2018 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)      1.072889        1.012176        0.967436
Semidiameter (arcsec)            894.433         948.083         991.929

HCI longitude                    272.016         164.815          48.971
HCI latitude                       7.305          -1.907          -5.610

Carrington longitude              35.955         288.754         172.910
Carrington rotation number      2203.900        2204.198        2204.520

Heliographic (HEEQ) longitude    107.200           0.000        -115.844
Heliographic (HEEQ) latitude       7.305          -1.907          -5.610

HAE longitude                    347.765         240.465         124.975

Earth Ecliptic (HEE) longitude   107.301           0.000        -115.490
Earth Ecliptic (HEE) latitude      0.058           0.000          -0.125

Roll from ecliptic north           0.020                           0.058
Roll from solar north              0.275                           4.811

Light travel time to Earth (min)          13.971          13.926

Separation angle with Earth              107.300         115.490
Separation angle A with B                        137.210

Carrington rotation 2204 runs from 2018-05-16 10:43 (DOY 136.45) to
2018-06-12 15:40 (DOY 163.65), as seen from Earth.

Last Revised: Monday, 21-May-2018 20:01:21 GMT
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