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IOAA

Games and tools for observing practice.

Games

All 14 games

Recognise

Name the constellationStar patterns Name the starNames and positions Name the Messier object110 deep-sky objects

Find

Constellation huntConstellation locations Star huntStellar navigation Messier huntLocate deep-sky objects

Memory & measurement

Star memoryName ↔ Bayer designation Bayer orderStars from α to ω Angular separationEstimate angles on the sky RA and declinationEquatorial coordinates

Observing tasks

Extra starsRemove chart intruders Missing starsComplete bright-star patterns Planets among starsFind and name the planets Place the SunDate → ecliptic position

Marathons

Messier marathon110 objects · field guide Game marathons5 disciplines · scores and leaderboards

Charts: Hipparcos / HYG · Sun and planets: JPL model · photographs: 2MASS (UMass/IPAC), DSS2 (STScI/NASA/CDS).