Re: Launch window question

From: pmafer via Seesat-l <seesat-l_at_satobs.org>
Date: Thu, 28 May 2020 15:57:38 +0100
https://www.space.com/spacex-demo-2-astronaut-launch-delay-explained.html

Its hard find accurate information... or thrusted

On Thu, May 28, 2020 at 3:39 PM pmafer <pmafer_at_gmail.com> wrote:

> 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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>
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Received on Thu May 28 2020 - 09:58:39 UTC

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