JAMES WEBB SPACE TELESCOPE

JAMES WEBB SPACE
TELESCOPE
PRESENTED BY
SREEJA N
EEE 8th SEM
RGIT

CONTENTS
 Introduction
 History
 Construction and Working
 Launch of JWST
 Advantages
 Disadvantages
 Conclusion
 Reference

INTRODUCTION
It is also called WEBB or JWST.
It is a large space based observatory telescope.
Is optimized for infrared wavelengths.
Include answering some of our most fundamental
questions about the origin of the cosmos.

 It will be located near the
Earth–Sun L2 point.
 It is 1,500,000 kilometers
(930,000 mi) from Earth,
directly opposite to the Sun.
 L2 point the combined
gravitational pull of the
Earth and the Sun .

HISTORY
This space-based observatory is named after James E.
Webb (1906- 1992).
 The project represents an international collaboration
of about 17 countries.
The JWST originated in 1996 as the Next Generation
Space Telescope (NGST).
Launch is scheduled for 2018 on an Ariane 5 rocket. Its
nominal mission length is of five years.
It is successor to NASA's Hubble Space Telescope.

CONSTRUCTION AND WORKING
It will be the largest space telescope.
 It has four main element
 the telescope.
 the instrument module(ISIM) .
 the sunshield .
 the spacecraft bus.

PRIMARY MIRROR
It consists of 18 individual
hexagonal mirror(6.8mtr die).
 The mirror segments is made
of beryllium.
The mirrors are build in
segments on a structure,
which will fold up, so that it
can fit into a rocket.

 The mirror segments deploy and get aligned in space by
commands from Earth.
 It can gather more light and resolve more details.
 The hexagonal shape allows a segmented mirror with high
filling factor
 Webb needs to be very cold ("cryogenic"), with its mirrors
at around -220 degrees C

SECONDARY AND TERTIARY
MIRROR
 The single secondary mirror is perfectly rounded and
convex
The tertiary mirror is the third stop for light coming
into the telescope and is the only fixed mirror in the
system
The light from an object reflects off the mirrors before
entering the science instruments in the back of the
telescope

SUNSHIELD
The JWST must be kept very
cold (under 50 K (−220 °C;
−370 °F))
 It uses a large sunshield to
block light and heat from
the Sun, Earth, and Moon
 L2 point keeps all three
bodies on the same side of
the spacecraft at all times.
Maintains a constant
environment for the
sunshield and solar arrays.

 The sunshield is made of polyimide film, has membranes
coated with aluminum on one side and silicon on the other
side
 It is designed to be folded twelve times so it will fit within
the Ariane 5 rocket
 The sunshield was hand-assembled at Man Tech Albama
 It is approximately tennis court-sized five-layer deployable
sunshield.

ISIM(Integrated Science
Instrument Module )
 The ISIM is the heart of the James
Webb Space Telescope
 This is the unit that will house the four
main instruments that will detect light
from distant stars and galaxies
Near-Infrared Camera
Near-Infrared Spectrograph
Mid-Infrared Instrument
Fine Guidance Sensor/ Near InfraRed
Imager and Slitless Spectrograph

Near-Infrared Camera
NIRCam will detect light from the
earliest stars
 NIRCam is equipped with
coronagraph
will cover the infrared wavelength
range 0.6 to 5 microns.

Near Infrared Spectrograph
It is being built by the European
Space Agency
Analyzing the spectrum of an
object can tell us about its
physical properties
 Multi-object capability
 Micro shutter system to control
how light enters the NIRSpec.

Mid-Infrared Instrument
 MIRI covers the wavelength range of 5 to 28
microns.
 Its sensitive detectors will allow it to see the
redshifted light of distant galaxies, newly
forming stars, and faintly visible comets .
 The Mid-Infrared Instrument (MIRI) has
both a camera and a spectrograph

Fine Guidance Sensor
 It has a wavelength range of 0.8 to 5.0
microns
 It is a "guider," which helps point the
telescope.

The Spacecraft Bus
 The spacecraft bus provides the
necessary support for the operation
 The bus is the home for six major
subsystems:
Electrical Power Subsystem
Attitude Control Subsystem
Communication Subsystem
Command and Data Handling
subsystem
Propulsion Subsystem
Thermal Control Subsystem

ADVANTAGES
 infrared light emitted by these regions can penetrate
this dusty cloud and reveal what is inside.
 JWST will offer unprecedented resolution and
sensitivity from long-wavelength visible to the mid-
infrared
 Understands the formation of stars and planets.
DISADVANTAGES
 James Webb telescope so far from the Earth.

CONCLUSION
James webb space telescope capabilities will enable a
broad range of investigations across the fields
of astronomy and cosmology. It observes some of the
most distant objects in the Universe, beyond the reach
of current ground and space based instruments

REFERENCE
http://www.jwst.nasa.gov
 The Scientific Capabilities of the James Webb Space
Telescope – Jon Gardner
 Comparative Planetology: Transiting Exoplanet Science
with JWST – Mark Clampin
 Planetary Systems and Star Formation with JWST –
George Rieke
 Study of Planetary Systems and Solar System Objects
with JWST – George Sonneborn

JAMES WEBB SPACE TELESCOPE

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