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Positions of STEREO A and B for 21-Sep-2023 16:00 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)
• ... other resources

                                STEREO-B           Earth        STEREO-A       Parker SP   Solar Orbiter     BepiColombo

Heliocentric distance (AU)      1.068310        1.004067        0.960436        0.291431        0.441997        0.462895
Semidiameter (arcsec)            898.267         955.740         999.159        3292.813        2171.116        2073.101

HCI longitude                    274.804         282.424         285.836         292.778         100.935         243.024
HCI latitude                       7.246           7.083           7.045           3.537          -7.504           0.603

Carrington longitude             115.711         123.332         126.744         133.686         301.843          83.932
Carrington rotation number      2275.679        2275.657        2275.648        2275.629        2275.162        2275.767

Heliographic (HEEQ) longitude     -7.621          -0.000           3.412          10.354         178.511         -39.400
Heliographic (HEEQ) latitude       7.246           7.083           7.045           3.537          -7.504           0.603

HAE longitude                    350.531         358.094           1.479           8.535         176.607         318.639

Earth Ecliptic (HEE) longitude    -7.563           0.000           3.386          10.441         178.513         -39.455
Earth Ecliptic (HEE) latitude      0.019          -0.000           0.066          -3.150          -0.383          -5.859

Roll from ecliptic north           0.145                          -1.116
Roll from solar north              0.751                           0.858

Light travel time to Earth (min)           1.256           0.604                   5.989          12.026           5.931

Separation angle with Earth                7.563           3.386                  10.901         178.464          39.817
Separation angle A with B                         10.949

Carrington rotation 2275 runs from 2023-09-03 17:48 (DOY 246.74) to
2023-10-01 00:16 (DOY 274.01), as seen from Earth.

Last Revised: Thursday, 21-Sep-2023 12:01:05 EDT
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