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Local Configuration
Ashburn
Lat:  39.0437  Lon:  -77.4875  Alt:  500
Timezone:   UTC-4   [ Change ]
Next Pass: Day
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AOS:  xx:xx   AZ: 00°
LOS:   xx:xx   AZ: xx°
MAX:  EL 00° / AZ 00°
Distância:   xxxx Km
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Meteoro: Bola de fogo rasga o céu da Austrália
Na noite do dia 15 de junho de 2020, uma bola de fogo extremamente brilhante cruzou o céu de diversas cidades da Austrália e pode ser vista em praticamente toda a costa noroeste do país. Imagens captadas por telefones celulares mostram o bólido se deslocando lentamente de oeste para leste, provavel...

Importante
Inscreva-se em nosso canal e pressione o sininho. Assim você ficará sabendo, com antecipação, quando houver novos programas ou transmissões ao vivo. Obrigado! :-)



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Forecast for SL-4 R/B Reentry
Update Tue 14-Jul-2020 11:59 UTC

The map above shows the location of the possible reentry of the space junk SL-4 R/B (44799U) predicted by modeling of orbital evolution until the fragment or satellite reaches the altitude of nominal burst.

According to the forecast made by Satview.org, the object's reentry will occur in Sunday, 19 Jul 2020 at 01:54 UTC, above the coordinates shown on map.

The second map shows the location of the reentry like predicted by USstratcom (United States Strategic Command).

SPACEJUNK - NEXT REENTRIES
SL-4 R/B
19 Jul 01h54

track
FALCON 9 DEB
19 Jul 21h10

track
FALCON 9 DEB
23 Jul 09h30

track
FALCON 9 DEB
24 Jul 10h57

track
SPACEJUNK - LAST REENTRIES
KZ-1A R/B
08 Jul 15h15
Details
FALCON 9 DEB
09 Jul 13h30
Details
FALCON 9 DEB
10 Jul 11h49
Details
FALCON 9 DEB
11 Jul 11h20
Details

How to Track Satellites

To track a satellite it is necessary to choose one. That is made by clicking directly on the satellite available on the "Great Visibility" column or after clicking on some of the categories. Once chosen, after a few seconds the program will begin the track the satellite.

Important
Make sure that the computer clock is correct and the time zone is compatible with your Region. On the Internet there are dozens of programs that keep your computer always on time.

On the main screen we can see the World map, where the satellite in movement stands out by two outlined lines. These lines are called "GroundTrack". The red line shows the first 90 minutes of the current orbit and the blue line, the 90 following minutes. Each point represents the position of the satellite at each minute and gets the name of the sub-satellite Point.

On the blue screen, right the map, we have the parameters panel, updated every second, which is divided in three main areas, as shown below.

Visibility conditions

For a satellite can be observed directly, it is necessary that the sunshine reaches its structure and is reflected into our eyes. For that to take place, it is necessary that the following factors are present at the same time:

1 - Dark sky: it should be night on the observation location
2 - The Sun's height: the solar disk should be between 10 and 25 degrees below the line of the horizon
3 - Illuminated satellite: the sun rays should be reaching the satellite directly
4 - The elevation angle: the satellite should be at least 25 degrees above the horizon

When these four conditions are achieved, we say that the satellite will be potentially visible during its passage over our station. Meaning that technically, it can be seen, nevertheless other factors can influence its observation, among them the satellite's altitude and size, its coating material and the atmospheric conditions of the local observation.

As a general rule, the closer the satellite passes over our station, the better the observation will be. That closer approach is directly related to the height of the satellite above the horizon line. The angle formed between the satellite and this line is called the elevation angle and the bigger this angle is, the closer to us the satellite will be.

The apex of that approach takes place when the satellite is exactly over the zenith, in other words, 90 degrees above the horizon, but not all the passages effectively reach that position.



Orbital Elements: 16 Jul 2020 03:40 (2020 198.15333098)

SL-4 R/B
1 44799U 19079C 20198.15333098 .01839970 28185-5 29283-3 0 9994
2 44799 97.8935 302.2183 0018528 256.9689 102.9568 16.33229668 37179

BD Usado: master_tle
Launch.: 2019 (79° from year, payload C)
Period: 88.2 min.
Revs/day: 16.3
Incl.: 97.9 degrees
Apogee: 185 km
Perigee: 185 km
Semi-major axis: 6563 km
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