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Using the SGP4 propagator, I calculated the minimum distance between ISS and Tiangong-2 for this year.

I obtained 12.32 km for 2017-09-27 17:29:36.376 UTC (which is the day 270.7289). I used the TLE 17270.72310185 for the ISS and the TLE 17270.58030751 for the Tiangong-2.

That distance seems very small. Is there any minimum safe distance to keep?

EDIT: I uploaded the graphs that I use to analyze the close encounter geometry: http://cristianopi.altervista.org/_Incontri.html (Sat1 = ISS, Sat2 = TG2).

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