Important notice about STEREO Behind

Positions of STEREO A and B for 13-Dec-2018 23:00 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)      1.021741        0.984395        0.957142
Semidiameter (arcsec)            939.209         974.840        1002.597

HCI longitude                    110.456           5.818         264.882
HCI latitude                      -6.944          -0.742           7.324

Carrington longitude             190.635          85.998         345.061
Carrington rotation number      2211.470        2211.761        2212.041

Heliographic (HEEQ) longitude    104.638           0.000        -100.937
Heliographic (HEEQ) latitude      -6.944          -0.742           7.324

HAE longitude                    186.065          81.631         340.689

Earth Ecliptic (HEE) longitude   104.434           0.000        -100.942
Earth Ecliptic (HEE) latitude     -0.146          -0.000           0.101

Roll from ecliptic north          -0.040                          -0.017
Roll from solar north             -2.568                          -0.662

Light travel time to Earth (min)          13.189          12.456

Separation angle with Earth              104.434         100.942
Separation angle A with B                        154.624

Carrington rotation 2211 runs from 2018-11-23 03:59 (DOY 327.17) to
2018-12-20 11:39 (DOY 354.49), as seen from Earth.

Last Revised: Thursday, 13-Dec-2018 23:01:03 GMT
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