HTV 9, possible post-manoeuvre orbit

From: Marco Langbroek via Seesat-l <>
Date: Sat, 23 May 2020 18:49:24 +0200
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.

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Received on Sat May 23 2020 - 11:51:39 UTC

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