ASTRONOMY 5

THIRD HOUR SESSION “C”

NAME

KEY-C

 

 

 

 

 

ACTIVITY:  Constellation Charts: Part II – Ecliptic, Seasons, Precession

DATE

 

ID#

 

1.  Other than stars, name three other types of celestial objects plotted on the charts.

Galaxies

Clusters

Nebulae

 

2.  Name three constellations found on the ecliptic.

Capricornus, Aquarius, Pisces, Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpius, Sagittarius, and Ophiuchus since it also lies on the ecliptic

 

3. Which constellation does the Sun occupy on the date of __August 25_?

Leo

4. Which constellation will the Sun occupy during the next __Equinox_ ? And for the _Solstice_ that follows this _ Equinox_ , which constellation will the Sun occupy?

Pisces

Taurus or Gemimi

5.  Near what line should you find the Moon or the planets?

Ecliptic

6. Other than the Sun, which very bright stars are  near the meridian at noon  on _June 10_?

Capella

Rigel

7.   What are the Right Ascension and Declination coordinates for the star ____Algol____ in the constellation of __Perseus__ ?

3h 05m (±5m)

+41° (±1°)

 

 

 

8.   What is the name of the star at RA = _2h 20m_ and Dec =__-3°__?  From the chart legends, what type of star is it and what is its magnitude?

Mira

Variable

3

9. If __Mars_ is in opposition on____February 1__, what constellation does it occupy?

Cancer

 

10.  In what year was the star Thuban considered the North Polar Star?

2700 BC (± 500 BC)

11. Examine the small segments of the SC001 star charts below.  The segment on the left is from a chart of epoch 1925.  The one on the right is set for epoch 2000, like the one you currently have.  What is the Bayer designation of the star indicated on the ’1925’ map?  How much did this star’s position change in 75 years (degrees)?  What phenomenon accounts for this change in location?

ω (omega) or

ω (omega) Pisces

1 degree (±0.25°)

precession

 

12. From your estimated amount of movement of the star in #11, calculate the period of one complete cycle of the phenomenon causing this star change in position. 

27000 (± 6000) years