OSN SMA
OSN Coaching Astronomy SMA
Celestial mechanics and observational data.
Astronomy Senior High coaching builds conceptual understanding first, then trains reasoning through graded problems, from school level to the OSN selection.
Who it's for
Senior High students who want to take part in the OSN Astronomy field, whether beginners or returning participants.
Stages & test format
OSN-S (School)
January – February 2026Selection at each school; schools register up to 5 students per field.
OSN-K (District/City)
18–19 June 202630–50 questions multiple choice & multiple choice
Duration: 1 hours 40 minutes
OSN-P (Province)
27–29 July 202625 multiple choice/hoursak + 5 short answer
Duration: 3 hours
National Semifinal
12 August 202620 multiple choice/hoursak + 5 short answer; online oral test
Duration: 3 hours + 2 hours
National Final
14–20 September 2026 (in person)Theory 5–10 essays · data analysis 1 set · observation 1 set
Duration: 3 hours · 3 hours · 3–5 hours
Official syllabus
Theory (IOAA reference)
- Basic astrophysics: celestial mechanics, spectroscopy & atomic physics, nuclear physics
- Mathematical methods: calculus, numerical methods, vectors, statistics & error analysis
- Spherical astronomy, coordinate & time systems
- Solar system, stars (properties, interiors, evolution)
- Stellar systems, exoplanets, galaxies, basic cosmology, instrumentation
Observation practical
- Naked-eye observation, star charts & catalogues
- Coordinate systems, magnitude & angular-distance estimation
- Telescopes & detectors
Data analysis
- Statistics & sources of error
- Graph paper with different scales & best fit
- Measurement techniques for physical quantities
Assessment
Weekly practice with explanations
Short quizzes per topic
Official-style selection simulations
Source: 2026 OSN Guidelines for Senior High (Pusat Prestasi Nasional). Dates may change, always check official Puspresnas announcements.
FAQ OSN Astronomy SMA
01What does OSN Astronomy SMA cover?
Theory (IOAA reference): Basic astrophysics: celestial mechanics, spectroscopy & atomic physics, nuclear physics; Mathematical methods: calculus, numerical methods, vectors, statistics & error analysis; Spherical astronomy, coordinate & time systems; Solar system, stars (properties, interiors, evolution); Stellar systems, exoplanets, galaxies, basic cosmology, instrumentation. Observation practical: Naked-eye observation, star charts & catalogues; Coordinate systems, magnitude & angular-distance estimation; Telescopes & detectors. Data analysis: Statistics & sources of error; Graph paper with different scales & best fit; Measurement techniques for physical quantities
02What are the OSN Astronomy SMA stages and formats?
OSN-S (School) (January – February 2026): Selection at each school; schools register up to 5 students per field.. OSN-K (District/City) (18–19 June 2026): 30–50 questions multiple choice & multiple choice, 1 hours 40 minutes. OSN-P (Province) (27–29 July 2026): 25 multiple choice/hoursak + 5 short answer, 3 hours. National Semifinal (12 August 2026): 20 multiple choice/hoursak + 5 short answer; online oral test, 3 hours + 2 hours. National Final (14–20 September 2026 (in person)): Theory 5–10 essays · data analysis 1 set · observation 1 set, 3 hours · 3 hours · 3–5 hours.
03Who is OSN Astronomy SMA training for?
Senior High students who want to take part in the OSN Astronomy field, whether beginners or returning participants.
04Is there online OSN Astronomy SMA training?
Yes. OSN Astronomy SMA training at Presisi Academy runs online with live classes, graded practice, and selection simulations. In-person classes are coming soon.