This isn't a regular adjustment using Progress engines. They usually involve firing thrusters for around 4 minutes, provide Δv of about 0.5 m/s and raise ISS orbit by around 1 km. The planned firing for this adjustment is about one minute, the Δv will be about 1.0 m/s and it will add 2 km to the orbit. I suspect possible use of Cygnus NG-13 thrusters. Bob Christy > On 17 Apr 2020, at 16:19, Jonathan McDowell via Seesat-l <seesat-l_at_satobs.org> wrote: > > Collision avoidance is never planned (or known to be needed) that far (it's > been in the schedule for several days already) in advance I think. > This is just a regular boost. > >> On Fri, 17 Apr 2020 at 06:21, Kevin Fetter via Seesat-l <seesat-l_at_satobs.org> >> wrote: >> >> On Apr 19, a planned change is the ISS orbit is scheduled to be done. At >> first, I thought it would be a orbit boost, but then I thought maybe it >> will be done for collision avoidance. as maybe something was to pass to >> close to the station without the change in orbit. >> >> Anything predicted to buzz the station soon. >> >> Kevin >> _______________________________________________ >> Seesat-l mailing list >> http://mailman.satobs.org/mailman/listinfo/seesat-l >> > _______________________________________________ > Seesat-l mailing list > http://mailman.satobs.org/mailman/listinfo/seesat-l _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-lReceived on Sat Apr 18 2020 - 11:42:13 UTC
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