Re: Launch window question

From: pmafer via Seesat-l <seesat-l_at_satobs.org>
Date: Thu, 28 May 2020 15:39:01 +0100
During yesterday broadcast from NASATV, one commentator refers exactly
about subject.

I don't recall exact time on video but your can search it on
https://www.youtube.com/watch?v=rjb9FdVdX5I after launch scrub.

I remember that its more than one factor. Orbital mecs, of course, weather,
ISS work schedule, etc.

cheers
Paulo

On Thu, May 28, 2020 at 11:34 AM Marco Langbroek via Seesat-l <
seesat-l_at_satobs.org> wrote:

> Op 28-5-2020 om 11:56 schreef Richard Cole:
> > Marco,
> >
> > As a guess, and I haven't run the numbers, there is a window of ISS
> position
> > around the orbit (with respect to the Cape, at the launch time) that can
> be
> > accessed within the period after launch allowed for in the mission
> timeline,
> > which seems to be around 20hrs. The ISS is within that window on the
> 27th, 30th
> > and 31st, but not the 28th or 29th. The instantaneous launch window is
> obviously
> > set by the ISS orbital plane and changes by a fixed period for each day.
>
>
> I think Richard is on the right track
>
> Upon further analysis:
>
> The choosen launch dates, assuming a similar 19-hour time-window between
> launch
> and docking, all result in docking while on the nightside of earth. While
> the
> two dates inbetween result in docking on the dayside of the earth.
>
> So illumination concerns seem to guide the choice here. Daytime might be
> avoided
> so as not to be blinded by the sun, perhaps.
>
> - Marco
>
>
> PS: my question was sparked because it popped up in a Zoom launchparty
> with a
> bunch of Dutch science writers and space people which I participated in
> yesterday. Nobody had a clear answer right away, but I think we have an
> answer
> now! Thanks to the hive mind!
>
>
> -----
> 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 Thu May 28 2020 - 09:39:54 UTC

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