Re: ISS orbit adjustment planned for Apr 19

From: Bob Christy via Seesat-l <seesat-l_at_satobs.org>
Date: Sat, 18 Apr 2020 17:41:12 +0100
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
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Received on Sat Apr 18 2020 - 11:42:13 UTC

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