Space Debris COSC 4335 by Arifur Sabeth 11/30/2009

Introduction Space debris, also known as orbital debris, space junk First satellite was launch in 1957 and break up in sodium-potassium (NaK)is one of the most important non-fragmentation sources of space debris

Travelling speed In low Earth orbit (below 2,000 km), orbital debris circle the Earth at speeds of 7 to 8 km/s. However, the average impact speed of orbital debris with another space object will be approximately 10 km/s.

Effects Debris left in orbits approximately 600 km normally fall back to Earth within several years. At altitudes of 800 km, the time for orbital decay is often measured in decades. Above 1,000 km, orbital debris will normally continue circling the Earth for a century or more.

Objective The objective of this paper is to find the effect of the NaK droplets on the long term evolution around the earth.

Pre-processing data Two types of Datasets are given Correlate them and visualize the effects of a new leakage. Possible future accidental loss.

Feature selection/ Dimensionality reduction Isolate NaK droplets from the 4014 objects in the 10-column table NaK droplets are supposed to be spherical in shape Find the high concentration in polarization of the NaK objects We can find concentration” or “clustering” in terms of their polarization, inclination, and altitudes.

Data mining By using WECA (software)

Post processing After using the Data mining algorithm we reduces the number of data from 4143 rows to 66 rows.

Results Sodium potassium coolant droplets (NaK) ~ 1 mm to 5 cm The effects of a new leakage at the low altitude of Cosmos 1900 would be significant.

Question? Comments! Thank you.