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Local Configuration
Ashburn
Lat:  39.0437  Lon:  -77.4875  Alt:  500
Timezone:   UTC-4   [ Change ]
Next Pass: Day
xx

AOS:  xx:xx   AZ: 00°
LOS:   xx:xx   AZ: xx°
MAX:  EL 00° / AZ 00°
Distância:   xxxx Km
CONTACT:
None
LIGHTSAIL-1 - TRACK AND SEE THE SOLAR SAIL EXPERIMENT

LIGHTSAIL-1 will deploy the sail in 03 june 2015, becoming visible at dusk and dawn.
Now, the spacecraft can be tunned in 437.435 MHz, sendind FSK packets in AX.25 protocol

ERS-1
Next 5 days above your City
Tabela de Passagem

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Forecast for ERS-1 Reentry
Update Wed 25-Apr-2018 22:10 UTC

The map above shows the location of the possible reentry of the space junk ERS-1 (21574U) 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 Monday, 14 May 2018 at 17:48 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
DELTA 2 R/B(1)
26 Apr 17h13

track
DELLINGR (RBLE)
27 Apr 01h27

track
SL-8 R/B
27 Apr 15h15

track
PSLV R/B
29 Apr 07h59

track
SPACEJUNK - LAST REENTRIES
LEMUR-2-TRUTNA
15 Apr 03h31
Details
FLOCK 2E'-1
15 Apr 15h21
Details
IRIDIUM 94 [P]
18 Apr 06h02
Details
FLOCK 2E'-3
18 Apr 12h14
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: 24 Apr 2018 20:38 (2018 114.86022095)

ERS-1
1 21574U 91050A 18114.86022095 .00578644 00000-0 16835+0 0 9997
2 21574 98.4991 62.7281 0034187 100.7880 259.7160 14.41295240402361

Launch.: 1991 (50° from year, payload A)
Period: 99.9 min.
Revs/day: 14.4
Incl.: 98.5 degrees
Apogee: 754 km
Perigee: 754 km
Semi-major axis: 7132 km
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