Quiz: Space: SSAO and Knowledge Graphs for Orbit

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Question 1 of 3

1. Question

Which three messages does the CCSDS Orbit Data Messages family, standard 502.0-B, define?

The Two-Line Element set, the General Perturbations message and the Conjunction Data Message
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The Orbit Parameter Message, the Orbit Mean-Elements Message and the Orbit Ephemeris Message
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The Orbit Parameter Message, the Conjunction Data Message and the Reentry Prediction Message
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The Tracking Data Message, the Attitude Data Message and the Orbit Ephemeris Message
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Question 2 of 3

2. Question

How do the IADC guidelines and the US FCC rule relate, as the lesson presents them?

The IADC guidelines are a binding treaty setting a five-year disposal limit, which the FCC relaxed to twenty-five years for US operators
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ISO 24113 sets the five-year limit and the FCC simply adopted it by reference in 2023
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The IADC guidelines are voluntary and shaped the well-known twenty-five-year post-mission lifetime expectation for LEO, while the FCC requires deorbit of licensed LEO satellites within five years of mission completion, a sharp tightening
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Both set a twenty-five-year limit; the difference is only that the FCC applies it to the geostationary protected region as well
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Question 3 of 3

3. Question

The lesson says that encoding a rule such as every mission in the protected LEO region must have a disposal plan with a stated post-mission lifetime and a source belongs to a particular layer. Which, and why?

It is a SHACL job rather than an OWL job, because it is a closed-world requirement: OWL will happily stay silent about the missing plan while SHACL fails the build
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It is an OWL job, because a minimum cardinality restriction on the disposal-plan property will make the reasoner flag any mission that lacks one
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It is a SPARQL job, because only a query can express the conditional dependence on the licensing state
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It is neither, because regulatory conditions are jurisdictional and must stay in a compliance matrix outside the graph
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Quiz: Space: SSAO and Knowledge Graphs for Orbit

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