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<DIV><FONT face=Arial size=2>Fabiano, isso ocorre porque qualquer corpo em
órbita desenvolve uma elipse, no caso da ISS, a terra está em um dos dois focos
da elipse, lembrando que o circulo é uma elipse cujos focos são
coincidentes. então a ISS está desenvolvendo uma orbita elipsoidal cuja
diferença entre os semieixos (porção maior = "semimajor axis" porção menor =
"semiminor axis) produz uma diferença de altitude em torno de 10 km
</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>para facilitar o entendimento, veja a órbita do
AO-40, ele chega a algumas centenenas de km proximo da terra e em seguida se
manda para a sua distancia máxima de alguns milhares de km, sua elipse é
bastante excentrica. Excentricidade é tão somente a relação entre o eixo menor e
o eixo maior de uma elipse (com uma formula que eu não saberia por aqui), em
tese, um circulo é uma elipse com os semieixos iguais (excentricidade =
0) e uma reta é uma elipse com os dois focos infinitamentes separados
(excentricidade = 1) </FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>Analizando os elements kepler 2 lines:</FONT></DIV>
<DIV><FONT face="Courier New" size=2>DECODE 2-LINE ELSETS WITH THE FOLLOWING
KEY: </FONT></DIV>
<DIV><FONT face="Courier New" size=2>1 AAAAAU 00 0 0
BBBBB.BBBBBBBB .CCCCCCCC 00000-0 00000-0 0 DDDZ
</FONT></DIV>
<DIV><FONT face=Arial size=2><FONT face="Courier New">2 AAAAA EEE.EEEE FFF.FFFF
GGGGGGG HHH.HHHH III.IIII JJ.JJJJJJJJKKKKKZ</FONT></FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>A-CATALOGNUM </FONT></DIV>
<DIV><FONT face=Arial size=2>B-EPOCHTIME </FONT></DIV>
<DIV><FONT face=Arial size=2>C-DECAY </FONT></DIV>
<DIV><FONT face=Arial size=2>D-ELSETNUM </FONT></DIV>
<DIV><FONT face=Arial size=2>E-INCLINATION </FONT></DIV>
<DIV><FONT face=Arial size=2>F-RAAN </FONT></DIV>
<DIV><FONT face=Arial size=2>G-ECCENTRICITY</FONT></DIV>
<DIV><FONT face=Arial size=2>H-ARGPERIGEE </FONT></DIV>
<DIV><FONT face=Arial size=2>I-MNANOM </FONT></DIV>
<DIV><FONT face=Arial size=2>J-MNMOTION </FONT></DIV>
<DIV><FONT face=Arial size=2>K-ORBITNUM </FONT></DIV>
<DIV><FONT face=Arial size=2>Z-CHECKSUM</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>compare a excentricidade (G) do GO-32 (0,0002039),
um dos que tem a orbita menos excentrica dos satelites e o AO-40 (0,7967944), um
dos mais excentricos, com a da ISS (0,0007920):</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>GO-32 </FONT></DIV>
<DIV><FONT face=Arial size=2>1 25397U 98043D 07227.78117367 .00000034 00000-0
33337-4 0 3756 </FONT></DIV>
<DIV><FONT face=Arial size=2>2 25397 098.4105 272.3746
>>>0002039<<< 072.4942 287.6470 14.23129678472637</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>AO-40 </FONT></DIV>
<DIV><FONT face=Arial size=2>1 26609U 00072B 07228.05566248 -.00000248 00000-0
10000-3 0 9200 </FONT></DIV>
<DIV><FONT face=Arial size=2>2 26609 006.2331 126.3395
>>>7967944<<< 353.1605 000.7209 01.25587986 31191</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>ISS </FONT></DIV>
<DIV><FONT face=Arial size=2>1 25544U 98067A 07229.01434028 .00008535 00000-0
57481-4 0 7989 </FONT></DIV>
<DIV><FONT face=Arial size=2>2 25544 051.6358 149.8408
>>>0007920<<< 254.1848 283.2351 15.76112068500370</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>73, Joca PS7JN</FONT></DIV>
<DIV> </DIV>
<DIV>----- Original Message ----- </DIV>
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<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=fabianomoser@gmail.com href="mailto:fabianomoser@gmail.com">Fabiano
Moser - PY5RX</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=sat-fm@yahoogrupos.com.br
href="mailto:sat-fm@yahoogrupos.com.br">sat-fm@yahoogrupos.com.br</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Cc:</B> <A title=cluster@radio-amador.net
href="mailto:cluster@radio-amador.net">Resumo Noticioso Electrónico ARLA</A>
</DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Friday, August 24, 2007 5:55
AM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> [sat-fm] [ISS] Porque a altitude
da ISS varia num mesmo dia?</DIV>
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<P>Olá pessoal, <BR><BR>Quem já acompanhou a variação de altitude da ISS num
mesmo dia ? <BR>Variando até 10Km quando está no extremo sul da passagem no
Oceano Pacífico chegando a 335,8Km e quando atinge a Europa/Ásia chega aos
346,6Km.<BR><BR>Por quê este fenômeno ocorre? <BR><BR>Tenho minhas suspeitas,
mas gostaria de entender melhor.<BR><BR>73 Fabiano PY5RX<BR><BR>[As partes
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<P></P>No virus found in this incoming message.<BR>Checked by AVG Free
Edition. <BR>Version: 7.5.484 / Virus Database: 269.12.2/967 - Release Date:
22/8/2007 18:51<BR></BLOCKQUOTE></BODY></HTML>