[amsat-bb] Re: XW-1 == YAOGAN 8 ?

Mani VU2WMY wmy at isac.gov.in
Wed Dec 16 19:24:36 PST 2009


YAOGAN 8 traveling faster could be due to possible initial orbit  
corrections and maneuvering that includes minor correction of  
injection velocity (delta V). The drag do influence even at  
geo-transfer and geo-synchronous orbits.

73 de
Mani, VU2WMY
Secretary & Station-In-Charge
Upagrah Amateur Radio Club VU2URC
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Quoting Alexandru Csete <alexc at phys.au.dk>:

> The influence of the drag force also depends on the mass since F=m*a,
> so the same drag force will cause less deceleration on a heavier
> satellite. You have to put this together with F=pressure*surface_area
> to take both the size and the mass of the satellite into account.
> By the way, is there any significant atmospheric drag at 1200 km
> altitude?
> 73
> Alex OZ9AEC
> On Wed, 16 Dec 2009 18:56:20 +0000
> Nigel Gunn G8IFF/W8IFF <nigel at ngunn.net> wrote:
>> OK, I'll revise my earlier question and suggest a reply.
>> The physically larger satellite will have more atmospheric drag which
>> will spiral it into a lower orbit. The lower orbit, the higher the
>> velocity and thereforeit crosses your horizon earlier.
>> Nigel Gunn G8IFF/W8IFF wrote:
>> >
>> > Is this correct that the higher mass satellite travels faster than
>> > the lower mass of XW?
>> >
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