IAO 2014, Практически тур, Група α — Задача 8. Comet

XIX Международная астрономическая олимпиада / XIX International Astronomy Olympiad, Бишкек – Чолпон-Ата, 12–21. X. 2014, Bishkek – Cholpon-Ata / Practical round. Problems to solve · 12 октомври 2014 г.

Условие

In the middle of July 2014, an automatic interplanetary spacecraft Rosetta of European Space Agency made the discovery that the comet 67P/Churyumov–Gerasimenko had a bipartite nucleus. On September 5th Rosetta was able to determine that its albedo was about 0.04 and the maximum nucleus length, 4 km.

On a separate sheet are the pictures demonstrating rotation of the comet nucleus, taken with 40 minutes intervals. Each picture has the date when it was taken and the angle of nucleus rotation relative to the first picture indicated on it. Using these images, determine the rotation period of the comet and plot its light curve based on them. Assume the same albedo over the entire surface of the comet.

According to NASA, the estimated distances at that time were as following:

Rosetta to Sun 557 794 935 km,
Rosetta to Earth 407 252 536 km,
Rosetta to the comet 12 294 km.

Решение

---

Оригинал в Архива: alphapract.pdf · допълнителни данни: jupiter.pdf · допълнителни данни: comet.pdf