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ARISSat-1 altitude is rapidly decreasing | Radioaficion Ham Radio

ARISSat-1 altitude is rapidly decreasing


On Tuesday, 27 Dec 2011, ARISSat-1 was losing about 4.1 km (~2.5 miles) a day in altitude, by Friday 30 Dec 2011 the decay was 5.9 km (3.6 miles) per day. This rate will continue to increase over the next days and ultimately result in the satellite burning up in the atmosphere.

Telemetry reports haven't shown a large increase in temperatures yet,please collect and report these values during each illumination period. There have been a number of people that continue to update their calculations on when the satellite will re-enter. Dates range from 30 Dec to 16 Jan.

The fall rate dh/dt is increasing dramatically. Be sure to do daily updates of the ARISSat-1/RadioSkaf-B Keps from The ARISSat-1 orbit changes daily while the satellite continues to lose altitude.

Roland, PY4ZBZ from Brazil has updated graphs of height and fall rate on his Web site:

Now that ARISSat-1 is in its last days, the Chicken Little Contest web site has been updated to include the individual submissions in each category nearest its likely reentry time. See:

You can see how you are doing compared to the competition! It appears that the submissions are sufficiently spread out that we will be able to determine unique winners in each category. However, you can help with this by keeping the telemetry submissions coming. Space Command does not maintain precise Tracking and Impact Prediction (TIP) for minor spacecraft.

A small satellite is considered to have reentered when three consecutive tracking stations fail to acquire it, which leaves a considerable window.

While the formal last telemetry contest is only open to submission through the telemetry programs, keep listening and note the time and place where you hear it last. After it has been confirmed to have

reentered, the last reception including voice and CW, may help narrow that window unless transmissions cease significantly before reentry.

[ANS thanks Gould, WA4SXM and Alan, WA4SCA for this information]

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