IOAA 2019, Нощни наблюдения и планетариум — Задача 2 (алт.). TASK 2/ALTERNATIVE: EPSILON LYRAE
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: 10 minutes
Find ε Lyr, and make a drawing of the field of view (with the object and other stars) with 10mm eyepiece. Label the directions North and East by two arrows and mark them as ‘N’ and ‘E’.
Estimate the angular distance between the wide pair (ε1-ε2), and estimate the position angle of the same pair.
Increase the magnification with 2x Barlow lens to be able to resolve and separate the two close pairs. Estimate the angle (in degrees to the nearest integer) subtended by the two close pairs relative to each other. (The enclosed angle of the two lines going through the two narrow pairs). Do not give any PA, only the relative angle of the two close pairs. No drawing is needed.
If you cannot find ε Lyr, the assistant can point to it for you, but only after 5 minutes. In this case you will lose the marks for pointing the telescope to the object. The telescope assistant will check the object at the end of the 10 min limit. If you are ready sooner, keep the star in the FOV, and wait for the check.
Решение
NO - TASK 2 / alternative: OBSERVING EPSILON LYR — TOTAL: 15 points
Checking the object in the FOV, and pointing is evaluated by the telescope assistant. (0-3 points)
FOV with 10 mm eyepiece: The components of the close pairs are not resolved.
FOV drawing: star field and directions:
| Criterion | Points |
|---|---|
| Correct direction & labelling of North and East relative to the star field | 2 |
| Correct drawing of at least 3 stars in the FOV | 1 |
| Correct drawing of at least 6 stars in the FOV | 2 |
| Wide pair distance: 208″ = 3,47′ | 2 |
| Wide pair PA: 172° | 3 |
| Correct estimation of the relative angle of close pairs | 3 |
Distance estimation of wide pair:
| d_(ε1-ε2) | Points |
|---|---|
| 3.2–3.8′ | 2 |
| 2.8–4.2′ | 1 |
Position angle of the wide pair:
| PA_ε2 | Points |
|---|---|
| 170–175° | 3 |
| 167–177° | 2 |
| 162–182° | 1 |
Relative angle between the direction of lines fitted onto the two close pairs: 92° (also the 88° complementary angle is acceptable – referring to this, the evaluation bands are centered to 90°)
| Relative angle | Points |
|---|---|
| 85–95° | 3 |
| 80–100° | 2 |
| 75–105° | 1 |
Теми и трудност
Трудност: неоценена.
Звезди · Светлина и астрономически измервания · Двойни звезди · 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