IOAA 2019, Нощни наблюдения и планетариум — Задача 4. TASK 4: VARIABLE STAR – AF CYGNI
OBSERVATIONAL ROUND – QUESTION SHEET · 15 т.
Бележка
Telescope: 150/750 Newton
Eyepieces: 25 mm, 10 mm, Barlow lens: 2x
Note:
- Telescope is already polar aligned.
- In case of bad sky conditions at low altitudes, task 1 and 2 will be replaced by alternative tasks 1 and 2 (see page 3). In this situation, the telescope assistant will cross out Tasks 1 and 2.
- You have to use 25 mm eyepiece for tasks 1, 3 and 4.
- For these tasks, if you finish before the allotted time, you must keep tracking the object with the telescope till the end of allotted time. The telescope assistant will check the object only at the end of the allotted time.
- For task 2, we recommend using 10 mm eyepiece and Barlow 2x.
- For task 5, you are not allowed to use the telescope.
PLANETARIUM ROUND – ANSWER SHEET
3 projected images with questions. Each part is 15 minutes long. Total time: 45 minutes.
Условие
available time: 15 minutes, total: 15 points
Use the given charts of the constellation Cygnus to find the variable star AF Cyg. The large scale finder chart has normal orientation (N is up E is to the left) The smaller scale chart has ‘telescope’ orientation (S is up W is to the left) Brightness of reference stars are given without decimal points. e.g. ‘97’ means 9.7 magnitude. If you do not find AF Cyg, the telescope assistant cannot help you to point to it in this task.
Estimate the magnitude of AF Cyg by comparing it with the reference stars and write it down, with decimal point, at one decimal accuracy (i.e. 9.7). Write the time of your observation in UTC. You may ask telescope assistant for the time in the local time zone (CEST).
Решение
NO - TASK 4: VISUAL MAGNITUDE ESTIMATION OF AF CYGNI — TOTAL: 15 p
Checking the object in the FOV, and pointing is evaluated by the telescope assistant. (0 - 8 points)
Brightness estimation:
Magnitude: ______ mag. Date, time: ______ UTC
| Magnitude | Points |
|---|---|
| ±0.2 mag | 6 |
| ±0.3 mag | 4 |
| ±0.4 mag | 2 |
Time in UTC (if corrected for Summer Time and Time Zone differences): 1 point
Reference estimation: according to 3 independent visual amateur observations during the night.
Теми и трудност
Трудност: неоценена.
Звезди · Светлина и астрономически измервания · Променливи звезди · Звездни величини
Предпоставки: Гимназиална подготовка
Оригинал в Архива: Observational Problems.pdf · официални решения: NO-solution.pdf · допълнителни данни: PL-solution.pdf · допълнителни данни: PL-problem-final.pdf