2. Constellations
The patterns of stars which
are seen in the sky are
called Constellations.
Astronomers use the term to
refer a group of stars that
form a particular shape in
sky.
3. The Celestial Sphere
It is an imaginary
sphere of which the
observer is the
center and which all
celestial objects
appear to be
projected and which
the apparent dome
of the visible sky
forms half.
4. International Astronautical Union
They divides the sky into 88 official
constellations with exact boundaries.
48 were already recognized and listed during
ancient times by Ptolemy
5. Asterism
Star patterns that have been
discovered but have not been
officially identified as
constellation
Most famous example is
big dipper, a constellation
that featured in Alaskan
State flag
6. Astronomical Instruments1
.
It is a reflecting telescope built
as an orbiting observatory
NASA of USA administer this
telescope
1. Hubble Space Telescope
(1990)
A spectrograph is an
instrument that takes the
pictures of spectrum light
7.
8. 1. Hubble Space Telescope
(1990)
Produces sharper images and
observes object which are 50 lines
fainter from the earth’s surface
Study ultraviolet and infrared lights
Provides evidence of the massive black
holes
9. 2. Ultraviolet Telescopes
Enables astronomers to
study extremely hot
objects in space including
quasars and stars called
white dwarfs
It also study how stars
form and the composition
of gas between stars and
galaxies
10. 3. X-ray Telescopes
X-rays have shorter wavelengths
and higher energy that UVR.
Simplest x-ray telescopes use
iron or lead slats instead of
mirrors
Through x-ray telescopes
found out that besides the sun,
many objects in the universe
gives off x-rays
11. 3. X-rays Telescopes
Brightest Sources of
x-rays are black
holes, pulsars,
supernova and
binary of double
stars.
The ANS, Ariel V,
OSO 9, SAS 3, OAO
3 obtained lot of x-
rays
12. Advanced X-ray Astrophysics Facility (AXAF)
Renamed the Chandra X-
ray Observatory in honor
of Nobelist Subrahmanyan
Chandrasekhar launched
in July 1999.
13. Constellation in Focus
The shapes of the
constellation depends on
the view of the person
looking at them from
Earth.
They can be viewed in
the northern and
southern hemisphere
of the Earth.
14. Currently we have 14 men and
women, 9 birds, 2 insects, 19
land animals, 10 water
creatures, 2 centaurs, one head
of hair, a serpent, a dragon, a
flying horse, a river, and 29
inanimate objects
15. Constellations in the Sky
Northern Hemisphere
Constellations
Southern Hemisphere
Constellations
88 constellations
44
constellations
44
constellations
19. Some Famous Constellation
Orion (The
Hunter)
Located on celestial equator and
visible throughout the world
Its family include Orion, Canis
Major, Canis Minor, Monoceres,
and Lepus.
20. Ursa Major
The big bear, is one of the
famous constellation
Its family contains 10
constellations including
Ursa Major, Ursa Minor,
Polaris, , Canes Venatici,
Bootes, Coma,Berenice,
Corona Borealis,
Camelopardalis, Lynx,
21. Cassiopei
a
Accd. To Ian Ridpath’s star tales,
Cassiopeia was a vain and boastful
wife of King Cepheus of Euthopia
Appears to be one of the
brightest stars in the Northern
Hemisphere
22. Draco
Myth claims that Draco is
always visible in the northern
hemisphere but not in the
southern hemisphere.
Draco – “The Dragon” is derived
from Latin term Draconem
meaning “huge serpent”
24. Hercul
es
It is named after Roman Hercules, Greek
Herakles who was the greatest Greek heroes and
famous for his 12 labors.
It belongs to one of the 48 constellations plotted
by Ptolemy and survived to become one of the 88
constellation recognized by IAU.