How many observations are required to confirm and locate reentry of the object for surveillance?

How many observations are required to confirm and locate reentry of the object for surveillance? Correct Answer 200-300

To obtain a higher degree of precision for space surveillance, once the object is launched in the orbit, more observations have to be taken during the orbital decay. This helps in confirming and locating the reentry. For this, 200-300 observations are required.
Bissoy MCQ

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