JAMES WEBB SPACE TELESCOPE 21.3’ (6.5m) dia mirror 1:48 …

1 JAMES WEBB SPACE ( ) diamirror1:48 JAMES Webb SPACE TELESCOPE (JWST) is a large, infrared-optimized SPACE TELESCOPE , scheduled for launch in 2014. JWST will find the first galaxies that formed inthe early Universe, connecting the Big Bang to our own Milky Way Galaxy. JWST will peer through dusty cloudsto see stars forming planetary systems, connecting the Milky Way to our own Solar System. JWST'sinstruments will be designed to work primarily in the infrared range of the electromagnetic spectrum, with some capability in the visible will have a large mirror , meters ( feet) in diameter and a sunshield the size of a tennis court. Both the mirror and sunshade won't fit onto the rocket fully open, so both will fold up and open once JWST is in outer SPACE .

2 JWST will reside in an orbit about million km (1 million miles) from the Webb SPACE TELESCOPE 1:48 scale1-Spacecraft Bus AssemblyMAIN BUSSTARTRACKERFOLD UPFOLD UPFOLD UPFOLD UPDO NOT FOLD USE TOATTACH FORE/AFT SUNSHIELD SUPPORTBEAMSC opyright 2010: John Jogerst. Not for commercial educational or personal use SENSORS bond paperSTAR TRACKERROLL-THEN CUTONE SQUARE ENDCYLINDER. CUT REMAINDER IN HALFAT 45 DEGREESROLLHGA MOUNTFOLD ARMS INTOBEAMS, REINFORCEELBOW W ITH ROLLMOUNT TO BLUE SQUARE ON BUSBUS ENDDISH ENDHGASECONDARYREFLECTORTRIPODPRIMARYREF LECTORCUTFOLD UPThe spacecraft bus houses the equipmentthat runs the satellite: keeping thebatteries charged; pointing the TELESCOPE /spacecraft at the targetstars; high gain antenna is used to receive commands from,and return the TELESCOPE s observations to, the Earth.

3 The star tracker takes sightings of reference starsto keep track of where the TELESCOPE is Webb SPACE TELESCOPE 1:48 scaleAFT EDGE OF BUS AND AFT END OF SOLAR SHIELD2-Solar ArraysMOMENTUM FLAPC opyright 2010: John Jogerst. Not for commercial educational or personal use MIRRORSUPPORT STRUTS2 OF 38-Secondary mirror AssemblyThe solar panel generates the powerthat runs the satellite and the TELESCOPE momentum flap helps stabilize the spacecraft. JWST is so precise that solarpressure on the large sunshields can actually rotate (slowly) the TELESCOPE , spoilingits aim. The flap adjusts to counteract part ofthis pressure to help keep the TELESCOPE view Webb SPACE Telescope1:48 scale3-Sunshields#5 bottom aft endMaster PatternROLLSTAR SENSORSO ption: print on bond paperROLL-THEN CUTONE SQUARE ENDCYLINDER.

4 CUT REMAINDER IN HALFAT 45 DEGREESPRINT THIS ON PLAIN BOND PAPERJ ames Webb SPACE Telescope1:48 scale3-Sunshields#5 bottom fore endMaster PatternPRINT THIS ON PLAIN BOND PAPERSTAR TRACKERThe sunshields keep the satellite cool byblocking the heat of the sun. This allowsthe JWST sinfra-red TELESCOPE to seeand analyze very faint, distant the JWST sees in infra-red light(heat), it must be kept very cold or theheat from the spacecraft itself would obscure its Webb SPACE Telescope1:48 scale3-Sunshields#4 aft endMaster PatternPRINT THIS ON PLAIN BOND PAPERJ ames Webb SPACE Telescope1:48 scale3-Sunshields#4 fore endMaster PatternPRINT THIS ON PLAIN BOND PAPERJ ames Webb SPACE Telescope1:48 scale3-Sunshields#3 mid aft endMaster PatternPRINT THIS ON PLAIN BOND PAPERJ ames Webb SPACE Telescope1:48 scale3-Sunshields#3 mid fore endMaster PatternPRINT THIS ON PLAIN BOND PAPERJ ames Webb SPACE Telescope1.

5 48 scale3-Sunshields#2 aft endMaster PatternPRINT THIS ON PLAIN BOND PAPERJ ames Webb SPACE Telescope1:48 scale3-Sunshields#2 fore endMaster PatternPRINT THIS ON PLAIN BOND PAPERJ ames Webb SPACE Telescope1:48 scale3-Sunshields#1 top aft endMaster PatternPRINT THIS ON PLAIN BOND PAPERJ ames Webb SPACE Telescope1:48 scale3-Sunshields#1 top fore endMaster PatternPRINT THIS ON PLAIN BOND PAPERJ ames Webb SPACE TELESCOPE 1:48 scale3-SunshieldsMOUNTING TABSSPREADER BARS cut cross beam bars short to achieve angle of sunshadeThe spreader bars hold the five sunshield layers apartto increase their insulating effectiveness. CROSSBEAMFOREAFTFORECROSSBEAMJ ames Webb SPACE TELESCOPE 1:48 scale4-Sunshield support beams trim ends if needed to buttwith spacecraft bus assemblyDo not bend black ears on end-used to attach to spreader Support BoomAFTThe sunshield supportbeams are the bones thathold the sunshields inposition.

6 Folded for launch, they unfold in SPACE to stretch out the center support boom is the backbone that connects the satellite bus to the instrumentsand Webb SPACE TELESCOPE 1:48 scale6-Integrated Science Instrument Module (ISIM)SECONDARY MIRRORSUPPORT STRUT1 OF 38-Secondary mirror AssemblyIECThe ISIM contains the TELESCOPE s science instruments that will observe and analyzedistant objects. Instruments include:Near InfraRedCamera (NIRCam), Near InfraRedSpectrograph (NIRSpec), Mid-InfraRedInstrument (MIRI),and the Fine Guidance Sensor Tunable Filter Camera (FGS-TFI) The support struts hold the secondary mirror precisely in positionto reflect light from the primary mirror to the science are folded for launch and unfold in Webb SPACE TELESCOPE 1.

7 48 scale6-Integrated Science Instrument ModuleTOPISIM Electronics Compartment (IEC)7-Primary MirrorPRIMARY MIRRORH ubble SPACE Telescopemirror to scale INSTRUMENT SHIELDThe IEC contains electronic equipmentthat generates heat when operating,so they must be isolated from thescience primary mirror collects infrared light for the science instruments. A meter (21 4 ) mirror makes JWSTthe most powerful SPACE TELESCOPE . JWST uses infra-red light (heat) to see objects at the very edge of ourvisible universe. mirror BACK SURFACEMIRROR FRONT SURFACEThe JWST mirror is so large it must be folded to fit into itslaunch rocket. The three mirror segment in the outer rowsare folded back for launch, then unfolded into precisealignment once JWST is in SPACE .

8 The mirror segments areheld in place by an intricate truss the rows fold back for Webb SPACE TELESCOPE 1:48 scaleFor detailed primary mirror ,cut out dottedcircle and insetthe backplane -FRONTFor a detailed scratch-build, refer to pictures andthe JWST web structure is truss of box mounts are welded, tube column of 3 mirrors folds back is thin mirror support struts mount to pads on backplane trussbehind JWST backplane actually consists of a truss structure attachedto the ISIM (black rectangular shape on part); the mirror supports(oval structures on part); thermal shields on the back of the mirrorsupports and a shielding panel at the bottom that prevent heat fromthe ISIM and IEC from reaching the mirrors.

9 This part has been simplifiedto make it easier to Webb SPACE TELESCOPE 1:48 scaleGLUE THIS FIRSTGLUE 2 NDREVISED backplane -BACKFor a detailed scratch-build, refer to pictures andJWST web structure is truss of box covers over mirror AssemblyAFT OPTICS CENTER ONFACE OF MIRRORThe secondary mirror takes the lightfocused by the primary mirror andsends it back to the instruments through the aft optics.