Съдържание

Условие 2.1 (40 т.)2.2 (40 т.)Решение

IOAA 2009, Наблюдения — Задача 2. Naked Eye Observations — Question 2

Оригинал на условието (PDF)Съобщи за грешка

Всички материали от IOAA 2009

3rd International Olympiad of Astronomy and Astrophysics — Observational Competition · 80 т.

Please read these instructions carefully:

All participants will receive a problem set, a writing board, a pen, a ruler and a headlight by the organizers.
This competition consists of two parts: i) Two questions on “Naked Eye observation”. You Have 12 minutes to answer these two questions. ii) One question on “Using a telescope”. Each part of this question has a specific time, which is mentioned in your question sheet.
All participants will be guided by assistants to the observing site until returning to the waiting hall. Assistants will collect the answer and problem sheets.
Do not forget to fill out the boxes at the top of each answer sheet with your country name and your student code.
You have 2 minutes to familiarize yourself with Observing ground and darkness of your environment, just before starting the exam time in observing ground.
Examiner’s alarm will indicate the beginning and the end of each part of your exam.
Each problem has a specific guideline which helps you during the exam.

Условие

Question 2 chart of Cepheus, Cassiopeia and reference stars. — Question 2 — Figure 2

2.1 (40 т.)

Figure 2 shows a part of the sky which contains Cephei constellation, for 22 October 2009 at 22:00 local time. Five bright stars in Cephei constellation are identified by numbers (1, 2, …, 5) and common names. Estimate the angular distances (in units of degrees) between two pairs of stars shown in table 2-1 and complete this table with your answers.

Tables 2-1 — Angular Distance

Pairs of stars	Angular Distance (degrees)
1 (Errai) and 2 (Alfirk)
1 (Errai) and 3 (Alderamin)

2.2 (40 т.)

Use table 2-2 and figure 2, then Estimate the “apparent visual magnitude” of stars 2 (Alfirak) and 3 (Alderamin) and complete Table 2-3.

Table 2-2

Star Name	Apparent Visual Magnitude
Polaris	1.95
Altais	3.05
Segin	3.34

All of these stars, are marked in the figure 2

Table 2-3 — Magnitude Estimation

Star Number	Star Name	Apparent Visual Magnitude
2	Alfirk
3	Alderamin

Решение

Part 1

Table 2 — Angular Distance

Stars Name	Angular Distance (Degree)
1 (Errai) and 2 (Alfirk)	$11^\circ:09^\prime:10^{\prime\prime}\sim11^\circ$
1 (Errai) and 3 (Alderamin)	$18^\circ:36^\prime:50^{\prime\prime}\sim19^\circ$

Marking Scheme: $\Delta=$ Error in estimation of angular distance.

Error	Points
$\Delta\le2^\circ$	20
$2^\circ<\Delta\le4^\circ$	10
$\Delta>4^\circ$	0

Part 2

Table 4 — Magnitude Estimation

Number	Star Name	Visible Magnitude
2	Alfirk	3.2
3	Alderamin	2.4

For Each Star:

Error	Points
$\Delta m\le0.2$	20
$0.2<\Delta m\le0.5$	15
$0.5<\Delta m\le0.8$	10
$0.8<\Delta m\le1.0$	5
$1.0<\Delta m\le1.2$	2
$\Delta m>1.2$	0

Теми и трудност

Трудност: неоценена.

Небесна сфера и сферична астрономия · Светлина и астрономически измервания · Небесни координати · Звездни величини

Предпоставки: Разширена олимпиадна подготовка

Оригинал в Архива: 2009_Observation.pdf · официални решения: IOAA2009_final.pdf