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11th Grade
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Muhammad Tamami
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PEMBAHASAN TO OSN-K
BAGIAN
ASTRONOMI
Muhammad Wildan Tamami
TOIKI 2022
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https://www.esa.int/ESA_Multimedia/Images/2018/03/Stellar_evolution
Bintang gagal => katai coklat
0,5 – 8 Msun => bintang mirip matahari
0,08 – 0,5 Msun => red dwarf
lebih dari 8 Msun => bintang bermassa besar
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https://en.wikipedia.org/wiki/Stellar_evolution
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Hertzsprung-Russel Diagram
Earth Science 14thedition, by Tarbuck, Lutgens, Tasa
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Refraktor : menggunakan lensa
+ Bagian dalam tertutup, tidak perlu sering pembersihan
- Mengalami aberasi kromatik
+ Citra lebih stabil dan tajam (pengaruh sirkulasi udara
- Penyerapan pada gelombang UV
dan suhu kecil)
- Bentuknya dapat berubah akibat gaya beratnya sendiri
+ Lebih stabil, tidak mudah goyah posisinya
( hanya ditopang di bagian pinggirnya )
Reflektor : menggunakan cermin
+ Tidak mengalami aberasi kromatik
- Mengalami aberasi sferik ( sphered mirror )
+ Ditopang penuh dari sisi belakang sehingga dapat dibuat besar
- Tabung terbuka, bagian dalam perlu sering dibersihkan
+ Hanya diperlukan sebelah sisi pada cermin yang lengkungannya
- Cermin perlu sering diatur ulang posisinya
sempurna
- Pembuatan cermin parabola susah dilakukan
Catadioptric : menggunakan lensa + cermin
+ Ukuran lebih kecil, mudah dibawa
- Memerlukan pengaturan ulang lebih sering dari refraktor
+ Lebih ringan
- Penggunaannya lebih kompleks
https://www.highpointscientific.com/astronomy-hub/post/equipment-reviews/pros-and-cons-of-catadioptric-telescopes
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— Maria Mitchell, Astronomer
"Do not look at stars as bright
spots only. Try to take in the
vastness of the universe."
Quote of The Day
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REFERENCES
● https://www.esa.int/ESA_Multimedia/Images/2018/03/Stellar_evolution
● https://en.wikipedia.org/wiki/Stellar_evolution
● Earth Science 14thedition, by Tarbuck, Lutgens, Tasa
● Modul Menuju Olimpiade Sains Nasional Bidang Astronomi, Hans Gunawan
● https://www.highpointscientific.com/astronomy-hub/post/equipment-reviews/pros-and-cons-of-catadioptric-telescopes
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PEMBAHASAN TO OSN-K
BAGIAN
ASTRONOMI
Muhammad Wildan Tamami
TOIKI 2022
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