Satellite Conjunction and Collision Examples

(201104–201206) Landsat-5 Conjunctions with the A-Train (Afternoon Constellation)

(20120404) Fermi - Cosmos 2251 close approach

(20130903) EOS Aura and Shijian (SJ)-11-02 satellite conjunction ppt (saved) web

On September 3, 2013, predicted close approach

Second in a series of SJ-11 satellites launched by China into an orbit very similar to that of the Morning and Afternoon Constellations.

Aura flight controllers prepared a RMM to avoid the close approach. They did not know whether SJ-11-02 was capable of maneuvering.

A request was sent through the US State Department to its Chinese counterpart to let their space agency know of NASA’s planned maneuver. A request was sent through the US State Department to its counterpart in China to let their space agency know of NASA’s planned maneuver, but there was no direct two-way coordination.

Both satellites maneuvered within hours of each other. Fortunately, the 2 maneuvers mitigated the risk.

Example of the need to improve communication with non-constellation satellites.

(20140204) EO-1 and HELIOS-2B close approach

(20140405) Sentinel 1A - ACRIMSAT close approach immediately after launch

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