IOAA Problems and Solutions
First held in Chiang Mai in 2007 with 22 countries. It runs more rounds than any other olympiad here: theory, data analysis, and observation both under the sky and in a planetarium.
2025
India
1 Daksha Mission not published 2 Makar-Sankranti not published 3 Gravitational Waves not published 4 Balmer Decrement not published 5 Quasars not published 6 Galactic Rotation not published 7 Neutron Star Binary not published 8 Shadow of a black hole not published 9 Atmospheric Seeing not published 10 Big Bang Nucleosynthesis not published 11 Stars through graphs not published 12 Hawking Radiation from Black Holes not published 13 30 Years of Exoplanets not published 14 Predicting arrival times of coronal mass ejections not published 15 Hypothesized Planet in the Solar System not published 16 Observer on a Ringed Planet not published 17 Know your Sky not published 18 Know your Grid not published 19 Know your Time not published 20 Discovery of 'Z' not published 21 Lensing Time Delay not published
2024
Brazil
1 Sundial not published 2 Galaxy Cluster not published 3 Asteroid not published 4 White Dwarf not published 5 Cmb not published 6 Cluster Photography not published 7 Castaway not published 8 Binary Hardening not published 9 Physics of Accretion not published 10 Greatest Eclipse not published 11 Ground Tracks not published 12 Photometric comparison of surveys not published 13 Shapley Hypothesis not published
2023
Poland
1 Neptune not published 2 Magnetic field not published 3 Microlensing not published 4 Europa not published 5 Dark Energy not published 6 Bolometer not published 7 Libration not published 8 Neutrinos not published 9 Second eclipse not published 10 Aldebaran not published 11 X-ray emission from galaxy clusters not published 12 Dart not published 13 Lisa not published 14 Distance to the Large Magellanic Cloud not published 15 Isolated black hole not published 16 Asteroid occultation not published 17 Starlink not published 18 Planetary Moons not published 19 Supernova not published 20 Knowledge of the sky not published 21 Retrograde Mars not published 22 TRAPPIST-1 not published
2022
Georgia
Show all 13 problems 1 Planck's units not published 2 Circumbinary planet not published 3 Expanding ring nebula not published 4 Journey Between Galaxies not published 5 Flaring protoplanetary disk not published 6 Photometry of Binary stars not published 7 Georgia to Georgia not published 8 Ring of a planet not published 9 Solar Retrograde Motion on Mercury not published 10 Accretion not published 11 Dyson Sphere not published 12 Co-orbital satellites not published 13 Relativistic Beaming not published 14 Gravitational wave astronomy Solution IOAA 2022 Data Analysis problem 14, Gravitational wave astronomy 15 Galactic Surveys Solution IOAA 2022 Data Analysis problem 15, Galactic Surveys 16 Observation 1 not published 17 Observation 2 not published 18 Observation 3 not published 19 Observation 4 not published 20 Observation 5 not published 21 Observation 6 not published 22 Observation 7 not published 23 Observation 8 not published 24 Observation 9 not published
2021
Colombia
Show all 13 problems 1 LIGO not published 2 Temperature of the Earth not published 3 Mars not published 4 ALMA - Calculating photons not published 5 Under pressure not published 6 Macondo and Melquiades not published 7 Menkalinan (beta Aurigae) not published 8 IOAA Logo not published 9 Pluto Satellites not published 10 Terrestrial Transit not published 11 Minimum velocity of a projectile not published 12 Hodograph not published 13 Lucy: The First Mission to the Trojan Asteroids not published Problems 4 problems
14 Data Analysis 1: Scaling Relations Problem Solution IOAA 2021 problem 14, Data Analysis 1: Scaling Relations 15 Data Analysis 2: Stars and Exoplanets Problem Solution IOAA 2021 problem 15, Data Analysis 2: Stars and Exoplanets 16 Observation (Solar Physics): The Solar Slap Problem Solution IOAA 2021 problem 16, Observation (Solar Physics): The Solar Slap 17 Observation (Planetarium) Problem Solution IOAA 2021 problem 17, Observation (Planetarium)
2019
Hungary
Show all 14 problems 1 Famous astronomical events not published 2 Deflection of radio photons in the gravitational field of solar system bodies not published 3 The supermassive black hole in the centre of Milky Way Galaxy and M87 not published 4 Improving a common reflecting telescope not published 5 Cosmic Microwave Background Oven not published 6 The height of the chimney of Tiszaujvaros power plant not published 7 Effect of sunspots on solar irradiance not published 8 Amplitude variation of RR Lyrae stars not published 9 Distance of the Lagrangian point L2 of the Earth-Moon system not published 10 South to East to North not published 11 Identification of light curves of types of selected variable stars not published 12 Distance to a Near-Earth Asteroid not published 13 Distance to the Coma galaxy cluster not published 14 Photographing a nanosatellite not published 15 Photometry and spectroscopy of Nova Del 2013 not published 16 Triply eclipsing hierarchical triple stellar system not published 17 Finderscope alignment not published 18 Observation of Saturn not published 19 M57 - field of view not published 20 Variable star - AF Cygni not published 21 Naked eye brightness estimation not published
2018
China
1 Super Luminal Galaxies not published 2 Distance not published 3 Atmospheric Refraction not published 4 Height of a Hill not published 5 Sidereal Time not published 6 Observe the Sun with FAST not published 7 Sunspot not published 8 A Possible Dark Matter Deficient Galaxy not published 9 Radio Galaxy not published 10 Vega and Altair not published 11 Thermal History of the Universe not published 12 Dust and Young Stars in Star-forming Galaxies not published 13 Compact Object in a Binary System not published
2017
Thailand
Show all 13 problems 1 The Large Magellanic Cloud in Phuket not published 2 Earth's Transit Zone not published 3 The Milky Way's Distant Outer Arm not published 4 21-cm HI galaxy survey not published 5 A Synchronous Satellite not published 6 Supernova 1987A not published 7 Life on Other Planets not published 8 The Star of Bethlehem not published 9 Galactic Outflow not published 10 Goto not published 11 Mass of the Local Group not published 12 Shipwreck not published 13 Exomoon not published 14 Calibrating the distance ladder to the LMC not published 15 The search for dark matter not published 16 Naked eye observation from real sky not published 17 Planet observation with real sky in panoramic 360-degree image not published 18 Analemma on another planet not published 19 Exposure time from a Photograph not published 20 Find True North from Moon shadow not published 21 Find Latitude from Equatorial Mount not published 22 Precision Polar Alignment with Equatorial Mount not published 23 Observation with Equatorial Mount Telescope not published 24 Observation with Dobsonian Telescope not published
2016
India
1 True or False not published 2 Gases on Titan not published 3 Early Universe not published 4 Shadows not published 5 GMRT beam transit not published 6 Cepheid Pulsations not published 7 Telescope optics not published 8 U-Band photometry not published 9 Mars Orbiter Mission not published 10 Gravitational Lensing Telescope not published 11 Gravitational Waves not published 12 AstroSat not published 13 Binary Pulsar not published 14 Distance to the Moon not published 15 Type IA Supernovae not published 16 Observation (Telescope) OT1 not published 17 Observation (Telescope) OT2 not published 18 Observation (Telescope) OT3 not published 19 Observation (Planetarium) OP1 not published 20 Observation (Planetarium) OP2 not published
2015
Indonesia
2014
Romania
1 Lagrange Points not published 2 Sun gravitational catastrophe! not published 3 Cosmic radiation not published 4 Sandra Bullock And George Cloony not published 5 The life-time of a main sequence star not published 6 The effective temperature of a star not published 7 Pressure of light not published 8 Space-ship orbiting the Sun not published 9 The Vega star in the mirror not published 10 Stars with Romanian names not published 11 Apparent magnitude of the Moon not published 12 Absolute magnitude of a cepheid not published 13 Eagles on the Caraiman Cross! not published 14 From Romania to Antipod! With a ballistic messenger not published 15 Black Hole in Milky Way not published 16 Thermodynamic test not published 17 IOAA Observer on an extrasolar planet not published
2013
Greece
Problems 1 problem
26 Observation (Day, indoors) Problem IOAA 2013 problem 26, Observation (Day, indoors)
2012
Brazil
2011
Poland
19 Analysis of times of minima not published 20 Weighing a galaxy not published 21 The Little Dolphin not published 22 Determining declination not published 23 Earth not published 24 Mars not published
2010
China
18 Data Analysis I: CCD image not published 19 Data Analysis II: Light curves of stars not published 20 Observation (Telescope) 1 not published 21 Observation (Telescope) 2 not published 22 Observation (Telescope) 3 not published 23 Observation (Planetarium) 1 not published 24 Observation (Planetarium) 2 not published 25 Observation (Planetarium) 3 not published
2009
Iran
16 High Altitude Projectile not published 17 Apparent number density of stars in the Galaxy not published 18 CCD Image Processing not published 19 Venus not published
2008
Indonesia
19 Virgo Cluster not published 20 Alpha Centauri not published 21 Age of meteorites not published 22 Observation Part I: Naked Eye Solution IOAA 2008 problem 22, Observation Part I: Naked Eye 23 Observation Part II: Telescope and CCD Solution IOAA 2008 problem 23, Observation Part II: Telescope and CCD
2007
Thailand
Show all 18 problems 1 Theory 1.1 not published 2 Theory 1.2 not published 3 Theory 1.3 not published 4 Theory 1.4 not published 5 Theory 1.5 not published 6 Theory 1.6 not published 7 Theory 1.7 not published 8 Theory 1.8 not published 9 Theory 1.9 not published 10 Theory 1.10 not published 11 Theory 1.11 not published 12 Theory 1.12 not published 13 Theory 1.13 not published 14 Theory 1.14 not published 15 Theory 1.15 not published 16 Theory 2: A Planet and Its Surface Temperature not published 17 Theory 3: Binary System not published 18 Theory 4: Gravitational Lensing not published 19 Galilean moons not published 20 The Moon's age not published 21 Solar System objects not published 22 Observation Part I: Celestial object pointer not published 23 Observation Part II: Binoculars not published
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