Fwd: HTV 9, possible post-manoeuvre orbit

From: tristan.cools--- via Seesat-l <seesat-l_at_satobs.org>
Date: Sat, 23 May 2020 22:42:54 +0200
---------- Forwarded message ---------
Van: <tristan.cools_at_gmail.com>
Date: za 23 mei 2020 om 22:42
Subject: Re: HTV 9, possible post-manoeuvre orbit
To: marco langbroek (prive) <marco_at_langbroek.org>


I just saw HTV 9 passing right on time according to Marco's elset.  So the
manoevre must have taken place. Orange color comming out from the West,
bright but dimming a bit towards the East but still naked eye.

gr, Tristan Cools


Op za 23 mei 2020 om 18:51 schreef Marco Langbroek via Seesat-l <
seesat-l_at_satobs.org>:

>
>
> For those wanting to try to see the Japanese HTV 9 cargoship tonight: if
> the HTV
> 9 follows the pattern of previous HTV missions, I expect a manoeuvre to a
> higher
> orbital altitude at about 19:05 UT today.
>
> If this indeed is the case, this should be an approximate post-manoeuvre
> orbit:
>
>
> HTV 9                              prognosis for 23 May post 19:05 UT
> 1 75607U 20030A   20144.79513889 0.00000000  00000-0  00000+0 0    00
> 2 75607  51.6684 109.3164 0014817 300.4883 146.4146 15.65779046    07
>
> Note that observers in Russia and southeast Europe could perhaps see
> something
> of the orbit raising burn.
>
> This is all under the condition that HTV 9 follows the pattern of previous
> HTV
> missions (particularly HTV 7 which I chose as an analogue, as so far their
> orbits are close).
>
> For NW European observers: this orbit would mean HTV 9 would pass 1.5
> minutes
> later compared to the pre-manoeuvre orbit during the first pass in
> twilight, and
> some 3.5 minutes later during the midnight pass.
>
> Of course, the reality could be quite different, so start to look around
> the
> predicted times for the pre-manoeuvre orbit (in case it hasn't manoeuvered
> at
> all) and continue well past the predictions based on this new elset if
> nothing
> shows up.
>
> The Netherlands currently has clear skies.
>
> - Marco
>
>
> -----
> Dr Marco Langbroek  -  SatTrackCam Leiden, the Netherlands.
> e-mail: sattrackcam_at_langbroek.org
>
> Station (b)log: http://sattrackcam.blogspot.com
> Twitter: _at_Marco_Langbroek
> -----
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Received on Sat May 23 2020 - 15:44:48 UTC

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