Tracking and Data Relay Satellite-B

Target entity: Tracking and Data Relay Satellite-B
Context triple: [STS-51L, plannedPayload, Tracking and Data Relay Satellite-B]

• A. SCISAT-1
  SCISAT-1 is a Canadian scientific satellite dedicated primarily to studying Earth's upper atmosphere and monitoring ozone layer chemistry and related trace gases.
• B. Deep Space Climate Observatory
  The Deep Space Climate Observatory (DSCOVR) is a NOAA and NASA satellite positioned at the Sun–Earth L1 Lagrange point that continuously monitors solar wind conditions and provides real-time space weather and Earth observation data.
• C. Vanguard 1 satellite
  Vanguard 1 satellite is an early American artificial Earth satellite launched in 1958 that became the fourth human-made object in space and the oldest still in orbit, used primarily for geophysical and atmospheric research.
• D. Terra satellite
  Terra is a flagship NASA Earth observation satellite that carries multiple instruments to monitor the planet’s climate, land, oceans, and atmosphere from polar orbit.
• E. Arabsat-6A
  Arabsat-6A is a high-capacity Saudi communications satellite launched in 2019 to provide television, internet, and telecommunications services across the Middle East, Africa, and Europe.
• F. None of above. chosen
• G. Unsure - the case is ambiguous/there is not enough information to decide.

Target entity: Tracking and Data Relay Satellite-B
Target entity description: Tracking and Data Relay Satellite-B was a NASA communications satellite intended to relay data between spacecraft in low Earth orbit and ground stations as part of the Tracking and Data Relay Satellite System (TDRSS).

• A. SCISAT-1
  SCISAT-1 is a Canadian scientific satellite dedicated primarily to studying Earth's upper atmosphere and monitoring ozone layer chemistry and related trace gases.
• B. Deep Space Climate Observatory
  The Deep Space Climate Observatory (DSCOVR) is a NOAA and NASA satellite positioned at the Sun–Earth L1 Lagrange point that continuously monitors solar wind conditions and provides real-time space weather and Earth observation data.
• C. Vanguard 1 satellite
  Vanguard 1 satellite is an early American artificial Earth satellite launched in 1958 that became the fourth human-made object in space and the oldest still in orbit, used primarily for geophysical and atmospheric research.
• D. Terra satellite
  Terra is a flagship NASA Earth observation satellite that carries multiple instruments to monitor the planet’s climate, land, oceans, and atmosphere from polar orbit.
• E. Arabsat-6A
  Arabsat-6A is a high-capacity Saudi communications satellite launched in 2019 to provide television, internet, and telecommunications services across the Middle East, Africa, and Europe.
• F. None of above. chosen