tugas Praktikum TIK

1. Dita Ayu Pertiwi
XI SCIENCE 2

2. Alpha Centauri

3. Definition
Alpha Centauri (α Centauri, α Cen; also known
as Rigel Kent )is the brightest star in the southernconstellation
of Centaurus and is currently inside the G-cloud. Although it
appears to the unaided eye as a single object, Alpha Centauri
is actually a binary star system(designated Alpha Centauri
AB or α Cen AB) whose combined visual magnitude of −0.27
makes it the third-brightest star in the night sky after the
−1.46 magnitude Sirius and the −0.72 magnitude Canopus.

4. The two main components are Alpha Centauri A and Alpha
Centauri B. A third star, known as Proxima Centauri, or Alpha
Centauri C (α Cen C), is probably gravitationally associated
with Alpha Centauri AB. Proxima is at the slightly smaller
distance of 1.29 parsecs or 4.24 light years from the Sun,
making it the closest star to the Sun, even though it is not
visible to the naked eye. The separation of Proxima from
Alpha Centauri AB is about 0.06 parsecs 0.2 light years or
13,000 astronomical units (AU); equivalent to 400 times the
size of Neptune's orbit.

8. Alpha Centauri A
is the principal member, or primary, of the binary system
being slightly larger and more luminous than the Sun. It is a
solar-like main-sequence star with a similar yellowish color

9. Alpha Centauri B
is the companion star, or secondary, of the binary system, and
is slightly smaller and less luminous than the Sun. Alpha
Centauri B is about 90% the mass of the Sun and 14% smaller
in radius

10. Alpha Centauri C
also known as Proxima Centauri, is of spectral class M5 Ve[ or
M5 VIe, suggesting this is either a small main-sequence star
(Type V) or subdwarf (VI) with emission lines Its B−V color
index is +1.90 and its mass is about 0.123 M☉, 129 Jupiter
masses.

11. How to see it
Unluckily for us in the Northern Hemisphere, Alpha Centauri
is located very far to the south on the sky’s dome. Most North
Americans never see it. The cut-off latitude is about 29
degrees north, and anyone north of that is out of luck. In the
U.S. the line passes near Houston and Orlando, but even from
the Florida Keys, the star never rises more than a few degrees
above the southern horizon.

12. For northern observers, there really are no good pointer stars
to Alpha Centauri. When the bright star Arcturus is high
overhead, Alpha Centauri might low in your southern sky,
assuming you are south of 29 degrees N. latitude.
Arcturus is the brightest star in
the constellation Boötes and the northerncelestial
hemisphere. With a visual magnitude of −0.04, it is
the fourth brightest star in the nightt sky, after
−1.46 magnitude Sirius, −0.86 magnitude Canopus, and
−0.27 magnitude Alpha Centauri. It is a relatively close
star at only 36.7 light-years from Earth, and, together
with Vega and Sirius, one of the most luminous stars in
the Sun's neighborhood.

13. History and Myth

15. pandora

16. polyphemus

17. Who Don’t Know ?
Remember..

18. Conclusion
1. Alpha Centauri is cool !
2. Alpha Centauri is the brightest star in the
southernconstellation of Centaurus
3. The Mythologist Of Alpha Centauri is Come
Fom Greek and Rome
4. Proxima Centauri is The Nearest star from our
Sun

19. Thanks For The Attention 