"All grown-ups were once children… but only few of them remember it.” ― Antoine de Saint-Exupéry

Soal Astro 3

Soal diambil dari buku McGraw Hill

Waktu : 3 Jam


1. Which of the following points or objects seems to stay fixed in the sky al the time?
(a) The vernal equinox
(b) The background of stars
(c) The sun
(d) Polaris

2. What is the declination represented by the sourth celestial pole?
(a) 18 h
(b) 0 o
(c) -90
(d) It cannot be defined because it changes with time

3. What is the celestial longitude of the winter solstice?
(a) 18 h
(b) 0 o
(c) -90
(d) It cannot be defined because it changes with time

4. A point specified as having a celestial latitude of 45 o 30′ 00” N. This is equivalent to how many degrees as a decimal fraction?
(a) 45.5 o
(b) 45.3 o
(c) 30.00 o
(d) There is not enough information to tell

5. How many hours of right ascencion correspond to one-third of a circle?
(a) 3 h
(b) 6 h
(c) 12 h
(d) None of the above

6. How many sidereal days are there in one full calender year?
(a) Approximately 366.25
(b) Approximately 365.25
(c) Approximately 364.25
(d) It depends on the celestial latitude of the observer

7. One second of arc represents what fraction of a complete circle?
(a) 1/60
(b) 1/3600
(c) 1/86400
(d) 1/1296000

8. The celestial latitude/longitude frame of reference
(a) is fixed relative to the background of stars
(b) is fixed relative to the sun
(c) is fixed relative to geostationary satellites
(d) is not fixed relative to anything

9. Which of the followong represent an impossible or improperly expresed coordinate value?
(a) RA = 12 h
(b) dec = +100
(c) 103 deg 00 min 20 sec W long
(d) 23 o S

10. Azimuth is another name for
(a) Right ascencion
(b) Compass bearing
(c) Celestial latitude
(d) Celestial longitude


1. Assume that your mass is 65 kg. What is the force of gravity exerted on you by the earth? Mass of the earth 5.97 x 10^24 kg and the radius of the Earth is 6378 km

2. What is the maximum value of the force of gravity exerted on you by Jupiter? 1 AU = 150 jt km and mass of Jupiter is 2 x 10^27 kg

3. What is the gravitational force between you and a person sitting 1/3 m away? Assume each of you has a mass of 65 kg (For simplicity, assume all objects are spherical)

4. If someone weighs (has a gravitational force acting on them) 150 pounds on Earth, how much do they weigh on Mars? Mass of Mars 6.39 x 10^23 kg and radius of Mars is 3394 km.

5. What is the circular velocity of the space shuttle in lower Earth orbit (300 km above the surface) ?

6. What was the minimum speed required for Apollo 11 to leave the Earth?

7. What is the desnsity of the Earth? How does this compare to the density of rocks (between 2000 and 3500 kg/m^3)? What does this mean?

8. There are about 7000 asteroids in our solar system. Assume each one has a mass of 10^17 kg. What is the total mass of all the asteroids? if these asteroids are all rocky, and so have a density of about 3000kg/m^3, how large a planet could be formed from them?

9. An asteroid’s closest approach to the Sun (perihelion) is 2 AU, and farthest distance from the Sun (aphelion) is 4 AU. What is the semi-major axis of its orbit? What is the period of the asteroid? What is the eccentricity?

10. Halley’s comet has an orbital period of 76 years and its furthest distance from the Sun is 35.3 AU. How close does Halley’s comet come to the Sun? How does this compare to the Earth’s distance from the Sun? What is the orbit’s eccentricity?


1. Mengapa anggota tata surya bergerak secara periodik?

2. Bagaimana cara membedakan bintang dan planet?

NB : Jangan buka buku yaa. Pilihan ganda minimal benar 8 adalah syarat saya memerika essay yang di email kan 😀


One comment on “Soal Astro 3

  1. Pingback: Pembahasan Soal Astro 3 « gugelberg

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This entry was posted on 16/02/2013 by in Astronomi.
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