Last update: 23 October 2011, 02:45 UTC (04:45 CEST)
On Sunday, 23 October 2011, between 1:45 UTC (3:45 CEST) and 2:15 UTC (4:15 CEST) the German ROentgen SATellite ROSAT has re-entered Earth's atmosphere. There is currently no confirmation if pieces of debris have reached Earth's surface.
Source DLR
Showing posts with label ROSAT. Show all posts
Showing posts with label ROSAT. Show all posts
October 23, 2011
October 22, 2011
22 -23-October التاريخ المتوقع لسقوط القمر روسات
Last update: 22 October 2011, 20:01 UTC (22:01 CEST)
Re-entry of ROSAT currently expected between Saturday 22 October 2011, 23:30 UTC (Sunday 23 October 2011, 01:30 CEST) and Sunday, 23 October 2011, 05:00 UTC (07:00 CEST).
Taking into account the most recent data, ROSAT will not re-enter over Europe
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October 8, 2011
مسارات القمر روسات فوق السودان 25 الي 31 اكتوبر ROSAT
October 7, 2011
ROSAT - 1 in 2000 chance of injury !!
NASA calculates a 1-in-3200 chance of UARS causing injury or damage. But at the end of October or beginning of November, ROSAT – a 2.4-tonne X-ray telescope built by the German aerospace lab DLR and launched by NASA in 1990 – will re-enter the atmosphere, presenting a 1 in 2000 chance of injury.
The higher risk stems from the requirements of imaging X-rays in space, says DLR spokesperson Andreas Schütz. The spacecraft's mirrors had to be heavily shielded from heat that could have wrecked its X-ray sensing operations during its eight-year working life. But this means those mirrors will be far more likely to survive a fiery re-entry.
At the European Space Agency in Darmstadt, Germany, the head of the space debris office, Heiner Klinkrad, agrees that ROSAT's design means more of it will hit the surface. "This is indeed because ROSAT has a large mirror structure that survives high re-entry temperatures," he says
US Strategic Command tracks all space objects and the US-government-run Aerospace Corporation lists both upcoming and recent re-entries on its website. But ROSAT is not yet on the upcoming list because its re-entry time is far from certain.
The moment a craft will re-enter is difficult to predict because it is determined by two main factors.
First, the geometry of the tumbling satellite as it enters the upper atmosphere, which acts as a brake.
Second, the behaviour of the upper atmosphere itself, which grows and shrinks with the amount of solar activity, says Hugh Lewis, a space debris specialist at the University of Southampton, UK.
"Solar activity causes the atmosphere to expand upwards, causing more braking on space objects. The reason UARS is coming back sooner than expected is a sudden increase in solar activity. Indeed, we expect to see a higher rate of re-entries as we approach the solar maximum in 2013," he says.
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October 5, 2011
My prediction for ROSAT re-entry
My prediction for ROSAT re-entry.
With in 20 days +-13 days !! :(
DLR information for ROSAT re-entry
The time and location of re-entry cannot be predicted precisely At present, scientists expect the X-ray satellite, which completes an orbit around Earth in about 90 minutes, to re-enter around the end of October 2011. Currently, this date can only be calculated to within plus/minus five weeks.This time slot of uncertainty will be reduced as the date of re-entry approaches. However, even one day before re-entry, the estimate will only be accurate to within plus/minus five hours .All areas under the orbit of ROSAT, which extends to 53 degrees northern and southern latitude could well be affected by its re-entry.
Last ROSAT Keps Elements from Heaven Above.com is
ROSAT
1 20638U 90049A 11278.21294523 .00351318 67772-4 48765-3 0 5261
2 20638 052.9796 239.1203 0004485 084.7998 275.3547 16.05443244191732
/EX
ROSAT - Mission parameters
DLR
Launch date 1 June 1990
Launch site Cape Canaveral, Florida, USA
Launch vehicle Delta II rocket
End of mission 12 February 1999
Control Centre German Space Operations Center (GSOC), Oberpfaffenhofen
Ground station DLR's ground station in Weilheim
Launch mass 2,426 kilograms
External dimensions 2.20 metres x 4.70 metres x 8.90 metres
Orbit around Earth Originally at an altitude of approximately 580 kilometres with an inclination of 53°
Payload a) X-ray telescope
Geomagnetic Disturbance Index
Solar Radio Data Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
SATELLITE ORBITAL DECAY software from The Australian Space Weather Agency
shows the following prediction table !
With in 20 days +-13 days !! :(
DLR information for ROSAT re-entry
The time and location of re-entry cannot be predicted precisely At present, scientists expect the X-ray satellite, which completes an orbit around Earth in about 90 minutes, to re-enter around the end of October 2011. Currently, this date can only be calculated to within plus/minus five weeks.This time slot of uncertainty will be reduced as the date of re-entry approaches. However, even one day before re-entry, the estimate will only be accurate to within plus/minus five hours .All areas under the orbit of ROSAT, which extends to 53 degrees northern and southern latitude could well be affected by its re-entry.
Last ROSAT Keps Elements from Heaven Above.com is
ROSAT
1 20638U 90049A 11278.21294523 .00351318 67772-4 48765-3 0 5261
2 20638 052.9796 239.1203 0004485 084.7998 275.3547 16.05443244191732
/EX
ROSAT - Mission parameters
DLR
Launch date 1 June 1990
Launch site Cape Canaveral, Florida, USA
Launch vehicle Delta II rocket
End of mission 12 February 1999
Control Centre German Space Operations Center (GSOC), Oberpfaffenhofen
Ground station DLR's ground station in Weilheim
Launch mass 2,426 kilograms
External dimensions 2.20 metres x 4.70 metres x 8.90 metres
Orbit around Earth Originally at an altitude of approximately 580 kilometres with an inclination of 53°
Payload a) X-ray telescope
Geomagnetic Disturbance Index
Solar Radio Data Prepared by the U.S. Dept. of Commerce, NOAA, Space Weather Prediction Center
SATELLITE ORBITAL DECAY software from The Australian Space Weather Agency
shows the following prediction table !
September 30, 2011
Another Satellite's Re-entry (ROSAT)
روسات هو قمر صناعي لقياس الأشعة السينية الآتية من بعض الأجرام السماوية. بلغ وزن القمر الصناعي بمعداته 2426 كيلوجرام وهو يعتبر أكبر قمرا صناعيا ألمانيا وزنا، وتكلف نحو 560 مليون مارك ألماني.
ROSAT re-entry
The defunct German Roentgen Satellite (ROSAT) is coming back to planet Earth -
sometime in late October or early November. The X-ray space observatory is less
than half the weight (2.4-tons) of the fallen UARS, but has an orbit that
ranges from latitudes of 53 degrees north and south, putting it in a position
where it can threaten a wide region that stretches from Canada to South
America. And while much of the spacecraft will disintegrate during it’s rapid
descent,.
ROSAT may not be larger, but this satellite will be one of the most dangerous satellites, giving Earth a 1 in 2000 chance of someone being hit. Anyone hit by this one would certainly not feel good and here is what makes this so dangerous.
ROSAT is Germany's Space Telescope. The satellite scope has mirrors that were designed and built for extreme heat. These mirrors will break, but most of it will be intact when it hits the Earth. The mirrors will act like a giant blade raining many pieces of glass onto a stretch of over 500 km.
UARS was dangerous due to the heavier pieces, but ROSAT will be dangerous because it will be like throwing knives out of an airplane and not knowing where thousands of these knives will land.
ROSAT simply is going to be one to watch over the next month. Recent solar storm activity is lessening the orbit day by day and the Sun will belch x-class flares toward the planet this week. This prompts the conclusion this satellite will come in next month, earlier than the later month forecast
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