## (solution) I need help completing a few questions pertaining to a lab for

I need help completing a few questions pertaining to a lab for star charts. I need help with only questions 8 and 11. I've already completed all the other questions, but I'm struggling with those two. I've attached all my answers in the PDF including the Star Charts I was required to use and label throughout the lab. The answers for 8 and 11 only have to be a couple sentences each.

The full lab is below:

Print out a copy of the star chart.

1. Find on the map the "topmost" star of the constellation Libra.

What is its Right Ascension in hours and minutes?

What is its Declination in degrees?

2. The sun's location at the first day of each season in the northern hemisphere is given in the table below. Plot its position on the rectangular star map for each date and label it with the season.

 Season RA Dec Autumn 12h 0m 0o Winter 18h 0m -23.5o Spring 0h 0m or 24h 0m 0o Summer 6h 0m +23.5o

3. Fill in the table below with the constellation closest to the sun's position (that is, the constellation the sun is 'in').

 Season Constellation the Sun is 'in' Autumn Winter Spring Summer

4. Now that the four principal seasons are plotted, imagine where the sun might be on dates between these points. For example, what are the approximate RA and Dec of the sun on October 22? How about May 21 and July 15?

October 22 RA: ________ Dec: ________

May 21 RA: ________ Dec: ________

July 15 RA: ________ Dec: ________

The sun always appears on the imaginary line called the ecliptic. The ecliptic can also be thought of as tracing the plane of the Earth's orbit.

5. Label the ecliptic on the star chart.

6. The following table lists the celestial coordinates for the major planets on September 24, 2004. Plot the planet positions on the map and label each planet. Try to use a different color pen than the sun positions.

 Planet RA Dec Mercury 11h 32m +5o Venus 9h 25m +15o Mars 11h 56m +1o Jupiter 12h 0m +1o Saturn 7h 50m +21o

7. Below, fill in the constellation closest to each planet's position on September 24, 2004:

 Planet Constellation Mercury Venus Mars Jupiter Saturn

*8. What can you conclude about the position of the planets relative to the plane of the Earth's orbit?

9. The following table lists the Moon's coordinates at 5 day intervals for a one month period. Plot the moon's position on the map and label each position with the date.

 Date RA Dec 9/24 20h 23m -25o 9/29 0h 46m +3o 10/4 4h 51m +26o 10/9 9h 14m +21o 10/14 13h 14m -7o 10/19 18h 2m -28o

10. For each of the above dates, fill in the constellation closest to each Moon position.

*11. What can you conclude about the Moon's orbit relative to the plane of the Earth's orbit?

Extra Credit (5 points)

Look up the current positions of the Moon and at least two planets and plot these for a 30-day period.  You can use a source like Astronomy Magazine or Sky and Telescope or you can use the web or the Starry Night CD to get the data.  Print out a separate star chart to do this.

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This question was answered on: Jan 30, 2021

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