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Re: KEPS UPDATE DAY 221



Hi Luc,

The shuttle is in a slightly lower orbit than the ISS
(by about 40 km now), which gives it a velocity
advantage to catch up to the station. At some point,
the shuttle will boost to an orbit almost identical to
the ISS, but still below it. When it does, it will
slow the gain of the shuttle on the station so that it
approaches at a nice-and-easy pace. This will extend
the time it will take for the shuttle to dock with the
station. The keps you have define the catchup orbit
that the shuttle is currently in, and don't consider
the upcoming burn that will slow it down.

I found a website that had some good visuals of these
maneuvers if you're interested:

http://resources.yesican-science.ca/iss07/docking.html

73,

Matt Bennett
KF6RTB

 

--- Luc Leblanc <lucleblanc6@videotron.ca> wrote:

> 
> 
> On 9 Aug 2007 at 9:47, Arthur Rowe wrote:on sarex-bb
> 
> > ISS (ZARYA)             
> > 1 25544U 98067A   07220.88563398  .00008468 
> 00000-0  56993-4 0  7430
> > 2 25544  51.6320 191.7165 0008104 217.9929
> 243.8684 15.76137509499091
> > STS 118                 
> > 1 32008U 07035A   07220.96978502 -.00000458 
> 11337-4  44973-5 0    29
> > 2 32008  51.6230 191.3661 0066241 180.9148
> 357.4615 16.00252620    04
> 
> When tracking in simulation  both with Orbitron they
> seems to be in contact 
> around 1051AM August 9 UTC? but rendez vous contact 
> is planned  at 1753 on 
> August 10?
> 
> (New set of keps for sts-118) from Orbitron
> 
> STS 118                 
> 1 32008U 07035A   07221.34395840  .00112440  00000-0
>  45295-3 0    54
> 2 32008  51.6280 189.4027 0020824 112.0883  48.2798
> 15.85219015    68
> 
> With this new set of keps contact simulation occurs
> at 0200 AM on the 10
> 
> Did anyone have an explanation for theses
> discrepancies? Even with day 221 set 
> of keps the contact time is now at 0111 August 10 
> "-"
> 
> 
> Luc Leblanc VE2DWE
> Skype VE2DWE
> www.qsl.net/ve2dwe
> WAC BASIC CW PHONE SATELLITE
> 
>  
> "-"
> "It is not the class of license the amateur holds,
> but the class of the amateur 
> that holds the license."
> 
> Luc Leblanc VE2DWE
> Skype VE2DWE
> www.qsl.net/ve2dwe
> WAC BASIC CW PHONE SATELLITE
> 
>  
> 
> ----
> Sent via sarex@amsat.org. Opinions expressed are
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