ARLA/CLUSTER: Quem advinha o dia da queda do ARIssat-1 ?

[Antonio Matias]

Estive a fazer umas contas rápidas
mas esta-me a sair tudo complexo demais.
Pelos dados que tinha, tentei fazer uma estimativa, mas se calhar os dados
que tinha não estavam correctos.

Ora
No Órbita 288, apontei num papel que o Pereigeu era de 375Km
Cada dia dá 15.61337191 orbitas

Hoje na órbita 445 o Perigeu está nos 373 Km
e a órbita agora 15.62015785

Para atingir o ponto de não-retorno o Sat tem de chegar ou 78Km de altitude.
Isto deu-me 23 mil e tal órbitas  à volta de 1500 dias.
Pois eu sei, é demais há aqui dados incorrectos...
Além do mais, não estou a conseguir perceber como calcular a aceleração que
é de 0,00044586.... por órbita.
Mas ainda assim creio que não seja tão linear.

Matemática.

Alguém tem mais dados sobre o Sat numa órbita antiga?
 Isto parece um bom desafio para lançar aí numa escola ao miúdos
Nesta matéria faltaram-me muitas réguadas.

73
Matias

2011/9/2 João Gonçalves Costa <joao.a.costa  ctt.pt>

> ** **
> ARISSatContest********[image: "Oh my goodness!" said Chicken Little. "The
> sky is falling!" I must go and tell the king!"]****"Oh my goodness!" said
> Chicken Little.  "The sky is falling! I must go and tell the king!" ****
> AMSAT is happy to announce the ARISSat-1/KEDR Chicken Little Contest. This
> is your opportunity to calculate, or guess, when ARISSat-1/KEDR falls out of
> orbit. This is defined as the time it crosses an altitude of 78 kilometers,
> which is considered to be the point of no return. While not part of the
> contest, the actual reentry may be visible depending on location. Reports
> are encouraged.
>
> As in the past, we will have three divisions:
>
> Student category for Kindergarten through grade 8 .
> Student category for High School, grades 9 through 12 .
> All others will be in the adult category.
>
> In addition to individual students, we encourage classes or organizations
> such as science clubs to make group submissions. Submissions are limited to
> one per person or group. Members of a group making a submission may not
> submit a second, individual entry.
>
> Adults and individual students should include their name and amateur
> callsign if they have one. ****Individual students should also give their
> grade in school.
> Student groups should include the name of their group or class, school, and
> which category they represent. ****Please give the UTC date in the format
> of day, month, year, hours, minutes, and seconds. ****Finally, we would
> like to know your city, state, province or region, and your country. ****Submissions
> will close on 15 October 2011 at 23:59:00 UTC.
> The closest predictions in each category will be recognized for their
> achievement.****Send your submissions to CHICKENLITTLE  ARISSAT1.ORG.**** Good
> luck!****
>
> ** **
>
> --
> António Matias****
>
> ** **
>
> CT1FFU - CR5A ****
>
> ** **
>
> www.dxpatrol.com ****
>
> ** **
>
> QRV: HF, 6m, 4m,2m,70cm,23cm****
>
> SSB, CW, MGM****
>
> DX, EME, Contest,Sat.****
>
> ** **
>
> Fonte: ct-comunicacoes-e-tecnologias *Em nome de *António Matias****
>
> --
> Para mais informações/opções visite o site, e edite a sua conta:
> http://groups.google.com/group/ct-comunicacoes-e-tecnologias?hl=en?hl=pt-PT
> ****
>
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>


-- 
António Matias

CT1FFU - CR5A

www.dxpatrol.com

QRV: HF, 6m, 4m,2m,70cm,23cm
SSB, CW, MGM
DX, EME, Contest,Sat.
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