IOAA 2011, Наблюдения, планетариум — Задача 1. Earth

Observing competition – planetarium round · 25 т.

General instructions

1. There are 2 questions, each worth 25 points. You have 80 minutes to solve them, of which :

   (a) 20 minutes for reading the question and preparing for the observations,

   (b) 40 minutes to perform all the observations in the planetarium (20 minutes for each questions),

   (c) 20 minutes for calculations and finishing your work.

2. Additional time is allowed to move to and from the planetarium.

3. Along with the questions you will be given a map of the sky, for use with both questions. The map is for epoch J 2000.0, using a polar projection with a linear scale in declination, and covers stars down to about $5^{\mathrm{th}}$ magnitude. You will also be given paper for working and notes, writing implements, a pencil sharpener and an eraser.

   Please take everything from the desk in the first room with you to the planetarium dome, as you will be going to a different room afterwards to finish your work.

4. At your place in the dome you will find a torch and clipboard. Please leave these two items behind for the next contestant.

5. Only answers given in the appropriate places on the question sheet and on the map of the sky will be assessed. The additional worksheets will not be assessed.

6. Clearly mark every page with your code number.

About the questions

Note: Azimuth is counted from $0^{\circ}$ to $360^{\circ}$ starting at S through W, N, E.

Условие

In Question 1 :

1. The sky is stationary, the observer is on the surface of the Earth.

2. Visible on the sky are: a comet, the Moon and a nova of about $2^{\mathrm{nd}}$ magnitude.

3. From the $11^{\mathrm{th}}$ minute, a grid representing horizontal coordinates will be projected on the sky, and will remain on until the end of the question.

A) On the map of the sky, mark (with a cross) and label the nova (mark it “N”) and the Moon (mark it with a Moon symbol) and draw the shape and position of the comet.

B) In the table below, circle only those objects which are above the astronomical horizon.

Note: you will lose 1 point for every incorrect answer.

C) When the coordinate grid is visible, mark on the map the northern part of the local meridian (from the zenith to the horizon) and the ecliptic north pole (with a cross and marked “P”).

D) For the displayed sky, give the :

geographical latitude of the observer : $\varphi = \dots\dots\dots$ ,

Local Sidereal Time : $\theta = \dots\dots\dots$ ,

time of year, by circling the calendar month :

Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec.

E) Give the names of the objects, whose approximate horizontal coordinates are :

azimuth $A_1 = 45^{\circ}$ and altitude $h_1 = 58^{\circ}$ : $\dots\dots\dots\dots\dots\dots$ ,

azimuth $A_2 = 278^{\circ}$ and altitude $h_2 = 20^{\circ}$ : $\dots\dots\dots\dots\dots\dots$ .

(If you can, use Bayer designations, IAU abbreviations and Messier numbers or English or Latin names.)

F) Give the horizontal coordinates (azimuth, altitude) of :

Sirius ($\alpha$ CMa) : $A_3 = \dots\dots\dots$ ; $h_3 = \dots\dots\dots$

The Andromeda Galaxy (M 31) : $A_4 = \dots\dots\dots$ ; $h_4 = \dots\dots\dots$

G) Give the equatorial coordinates of the star marked on the sky with a red arrow :

$\alpha = \dots\dots\dots\dots$ ; $\delta = \dots\dots\dots\dots$

Решение

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Оригинал в Архива: 2011_Planetarium.pdf