List

IOAA Jr Problems and Solutions

The junior counterpart of the IOAA, first held in Romania in 2022, with a theory round and observation rounds on sky maps and at the telescope. Here are the papers from 2022 to 2025, with solutions for 2022, 2023 and 2025.

2025

Romania

Theory9 problemsProblems and solutions
  • 1Binary Systemnot published
  • 2Speed of Asteroidnot published
  • 3Where is Theodornot published
  • 4Exploring NEAsnot published
  • 5Ceahlǎu Mountainnot published
  • 6The Flying Aquillanot published
  • 7Lunar Eclipsenot published
  • 8Roche Limit, Hill Sphere, Lagrange Pointsnot published
  • 9Lightcurvesnot published
Observation (Sky Map)3 problemsProblems and solutions
  • 10Know your skynot published
  • 11Chart and timenot published
  • 12Missing starsnot published
Observation (Telescope)4 problemsProblems and solutions
  • 13Problem OT1not published
  • 14Problem OT2not published
  • 15Problem OT3not published
  • 16Problem OT4not published

2024

Nepal

Theory12 problemsProblems
  • 1Problem T1not published
  • 2Problem T2not published
  • 3Problem T3not published
  • 4Problem T4not published
  • 5Problem T5not published
  • 6Problem T6not published
  • 7Problem T7not published
  • 8Problem T8not published
  • 9Problem T9not published
  • 10Problem T10not published
  • 11Problem T11not published
  • 12Problem T12not published
Observation (Sky Chart)3 problemsProblems
  • 13Problem OC1not published
  • 14Problem OC2not published
  • 15Problem OC3not published
Observation (Telescope)2 problemsProblems
  • 16The Moonnot published
  • 17Problem OT2not published

2023

Greece

Theory12 problemsProblemsSolutions
  • 1Horizon crossingnot published
  • 2Planet orbitsnot published
  • 3Unresolved binary starnot published
  • 4Rapidly spinning neutron starnot published
  • 5Moon phasesnot published
  • 6Solar eclipsenot published
  • 7Parallax and proper motionnot published
  • 8Telescopenot published
  • 9Cosmologynot published
  • 10H-R Diagramnot published
  • 11SIRIUS A and Bnot published
  • 12Satellitesnot published
Observation (Sky Map)2 problems
  • 13Observation (Sky Map)Navigating the night skyProblem
  • 14Observation (Sky Map)Navigating the night skyProblem
Observation (Telescope)2 problemsProblems
  • 15Sun Observationsnot published
  • 16Cloud Sky Observationnot published

2022

Romania

Theory12 problems
  • 1TheoryThe stars observed with the telescopeProblemSolution
  • 2TheoryThe Sun on the HorizonProblemSolution
  • 3TheoryThe escape velocityProblemSolution
  • 4TheoryThe Terrestrial SatelliteProblemSolution
  • 5TheoryAndromeda Galaxy RotationProblemSolution
  • 6TheoryThe Sun as seen from SaturnProblemSolution
  • 7TheoryBalls Suspended inside a Terrestrial SatelliteProblemSolution
  • 8TheorySpaceship to the SunProblemSolution
  • 9TheoryThe Moon, seen on the way to the MoonProblemSolution
  • 10TheoryThe luminosity of a starProblemSolution
  • 11TheoryZodiac IOAA-J-2022ProblemSolution
  • 12TheoryThe rocket that destroys the threatening asteroidProblemSolution
Observation (Sky Map)1 problemSky MapProblemSolution
  • 13Observation (Sky Map)Sky MapProblemSolution
Observation (Night)2 problemsProblems
  • 14Observations with naked eyenot published
  • 15Observations using the astronomical telescopenot published