Astronomy

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5 domain-specific abstractions whose origin domain is Astronomy.

• A-Type Main-Sequence Star — A star assigned both an A spectral subtype and luminosity class V in the MK system, ordinarily identifying a hot core-hydrogen-burning dwarf through comparison with spectral standards.
• Binary system — An astronomical system of two comparable bodies gravitationally bound around a common barycenter, often distinguished from a primary with a negligible satellite.
• Comet — Classify and model a small body through the coupled system of a volatile-bearing nucleus, trajectory-dependent heating, gas-and-dust loss, coma or tail formation, and activity-driven evolution, without requiring the body to be visibly active at every observation.
• Guide Star — Use a selected natural or artificial optical source as a repeatedly sensed reference whose measured displacement or wavefront error drives telescope pointing or adaptive-optics correction.
• Northern celestial hemisphere — The half of the celestial sphere north of the celestial equator.