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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

SL-4 R/B
Next 5 days above your City
Tabela de Passagem

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Forecast for SL-4 R/B Reentry
Update Wed 24-Apr-2019 18:08 UTC

The map above shows the location of the possible reentry of the space junk SL-4 R/B (43033U) 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, 12 May 2019 at 07:59 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
BEEAGLESAT
26 Apr 23h44

track
CZ-2C R/B
29 Apr 07h46

track
GSLV R/B
30 Apr 13h54

track
TOKI
02 May 15h01

track
SPACEJUNK - LAST REENTRIES
GSLV R/B
05 Apr 09h16
Details
H-1 R/B(1)
05 Apr 20h19
Details
SL-4 R/B
07 Apr 07h30
Details
ELECTRON R/B
15 Apr 04h08
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 2019 08:50 (2019 114.36837379)

SL-4 R/B
1 43033U 17076B 19114.36837379 .00452965 57745-5 37898-3 0 9998
2 43033 67.0945 105.6919 0103826 316.9394 42.3702 16.02714292 78133

Launch.: 2017 (76° from year, payload B)
Period: 89.8 min.
Revs/day: 16
Incl.: 67.1 degrees
Apogee: 265 km
Perigee: 265 km
Semi-major axis: 6643 km
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