Re: Re-entries Today

From: Bob Christy via Seesat-l <>
Date: Wed, 20 May 2020 19:19:08 +0100
Correction - re-entry time for Cygnus NG-13 is 19:35 UTC, one hour later than the one I posted.

Robert Christy

> On 20 May 2020, at 18:47, Bob Christy <> wrote:
> ´╗┐Navigation warning issued May 15 (HYDROPAC 1444) covered an area of the southern Pacific on May 20 with times between 19:11 and 20:26 UTC. It matches the ground track and timing of Cygnus NG-13.
> The warning has been cancelled and substituted with one running 17:00 - 23:59 UTC covering the same area (HYDROPAC 1552).
> A successful launch of HTV-9 on May 20 at 17:31 UTC will send it over the same area on rev 1 and at the same time as Cygnus, leading to a thought that the Warning is for its H-IIB rocket upper stage rather than Cygnus.
> However a NOTAM from Chile for HTV-9 shows an area that matches the H-IIB rev 0 ground track rather than rev  1. Unfortunately, the times in the Chile NOTAM match rev 1.
> The extended times in HYDROPAC 1552 make sense if they have been changed to cover both the H-IIB re-entry and de-orbit of Cygnus. The area notified is large enough to cover both events.
> Experience suggests that we won't hear anything immediate from Northrop Grumman about a de-orbit. The first clue, if Cygnus has been de-orbited, will probably be it's absence from view to European observers when Cygnus, HTV and ISS are visible later today.
> Bob Christy

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Received on Wed May 20 2020 - 13:20:22 UTC

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