IOAA 2019, Нощни наблюдения и планетариум — Задача 5. TASK 5: NAKED EYE BRIGHTNESS ESTIMATION
OBSERVATIONAL ROUND – QUESTION SHEET · 5 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: 5 minutes
Estimate the visual magnitude of the two naked-eye stars marked on the stellar chart of constellation Ursa Minor:
a) ζ UMi (zeta UMi = Alifa) – STAR 2
b) γ UMi (gamma UMi = Pherkad) – STAR 1
c) Write your estimate with one decimal accuracy (e.g. 8.6).
Estimate the angular distance between γ UMi (STAR 1) and Polaris in degrees.
Решение
NO - TASK5: NAKED EYE MAGNITUDE ESTIMATION OF 2 STARS — TOTAL: 5 p
Brightness estimation of STAR 2: 4.3 mag (zeta UMi)
Brightness estimation of STAR 1: 3.0 mag (gamma UMi)
Values within ±0.2 mag: 2-2 points
Values within ±0.3 mag: 1-1 point
Angular distance estimation between γ UMi and Polaris: 19°
Values within ±3°: 1 point
Теми и трудност
Трудност: неоценена.
Светлина и астрономически измервания · Звездни величини · Ъглов размер
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