SCET

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Definition

Noun: - Spacecraft Event Time: The specific, standardized time measurement used onboard a spacecraft, synchronized to Coordinated Universal Time (UTC). It is calculated as the sum of the Transmission Received Time (TRM) on Earth and the One-Way Light Time (OWLT) delay for the signal to travel from the spacecraft.

Usage
  • SCET is a technical term used primarily in space mission operations, astronomy, and aerospace engineering to timestamp events or data originating from a spacecraft.
  • It is used to distinguish the time an event on the spacecraft from the time the signal reporting that event is on Earth.
Examples
Advanced Usage
  • SCET vs. ERT: SCET (Spacecraft Event Time) is often contrasted with ERT (Earth Received Time), which is the time a signal from the spacecraft arrives at a ground station on Earth. The relationship is: SCET = ERT - OWLT.
Variants and Related Words
  • ERT (Earth Received Time): The UTC time when a signal from a spacecraft is received at a ground station on Earth.
  • OWLT (One-Way Light Time): The time it takes for a signal to travel at the speed of light from the spacecraft to Earth (or vice versa).
  • TRM (Transmission Received Time): Synonymous with ERT; the time a transmission is received on Earth.
  • UTC (Coordinated Universal Time): The primary time standard by which the world regulates clocks and time.
Synonyms
  • Spacecraft Time
  • Onboard Time
Notes
  • SCET is an acronym and is typically written in uppercase.
  • This term is highly specialized and is not used in everyday conversation. It is specific to the context of spaceflight and deep-space communication.
Noun
  1. the coordinated universal time on board the spacecraft
    • SCET = TRM + OWLT

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