James Webb Space Telescope (JWST) 1: Project Status and Moving Targets
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1 James Webb Space Telescope (JWST) 1: Project Status and Moving Targets IAC Winter School Tenerife November 2016 J. Stansberry (STScI)
2 James Webb Space Telescope (JWST) Organization Mission Lead: Goddard Space Flight Center International collaboration with ESA & CSA Prime Contractor: Northrop Grumman Aerospace Systems Instruments: Near Infrared Camera (NIRCam) Univ. of Arizona Near Infrared Spectrograph (NIRSpec) ESA Mid-Infrared Instrument (MIRI) JPL/ESA Fine Guidance Sensor (FGS) CSA Operations: Space Telescope Science Institute Description Deployable infrared telescope with 6.5 meter diameter segmented adjustable primary mirror Cryogenic temperature telescope and instruments for infrared performance Launch on an ESA-supplied Ariane 5 rocket to Sun-Earth L2 JWST Science Themes 5-year science mission (10-year goal) End of the dark ages: First light The assembly of Birth of stars and Planetary and reionization galaxies proto-planetary systems and systems the origin of life IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 2
3 James Webb Space Telescope (JWST) Integrated Science Instrument Module (ISIM) IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 3
4 JWST Vital Stats General Astrophysical Observatory Mission Lifetime: 5 years required, 10 years goal Primary mirror 6.5 meters in 18 segments Diffraction limited image beyond 2 microns wavelength Sunshield 5 layers, 21.2 meters by 14.2 meters Thermal (cooling) and scattered light control Perational Orbit 1.5 million km (0.01 AU) from Earth, L2 point Operating temperature Below 50 Kelvin, 5K for mid-ir instrument Four Science Instruments Imaging, Spectroscopy, Coronagraphy microns wavelength IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 4
5 5 IAC Winter School 2016JWST Solar System Explorations - - J. 5
6 JWST Instrumentation - NIRCam 1 5 um imager Slitless spectroscopy (exoplanets, cosmology) Wavefront sensing 2 identical, fully redundant modules IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 6
7 JWST Instrumentation - NIRSpec 1 5 um spectrometer Multi-object Imaging (IFU) 3 resolving powers IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 7
8 JWST Instrumentation - MIRI 5 28 um imager and spectrometer Imaging spectroscopy (IFU) R ~ 2000 IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 8
9 JWST Instrumentation FGS / NIRISS FGS: Fine Guidance Sensor Pointing 16Hz Key for moving targets NIRISS: um imager Slitless spectroscopy (exoplanets) Aperture masking interferometry IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 9
10 Integrated Science Instrument Module Assembly MIRI NIRSpec IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 10 10
11 ISIM Fully Integrated for Cryo-vac and Flight NIRCam IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 11 11
12 ISIM Fully Integrated for Cryo-vac and Flight ISIM Electronics Compartment (IEC) FGS/NIRISS Harness Radiator (HR) MIRI NIRCam NIRSpec IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 12 12
13 Primary Mirror Segment Optical Testing IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 13
14 Primary Mirror Backplane Carbon fiber composite structure. Deployable wings 3 segment each. Deployable secondary mirror support IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 14
15 Primary Mirror Backplane Carbon fiber composite structure. Deployable wings 3 segment each. Deployable secondary mirror support IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 15
16 Primary Mirror Assembly IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 16
17 Primary Mirror Assembly IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 17
18 ISIM Cryo-vac 3 test complete March 2016 The Integrated Science Instrument Module, containing the 4 science instruments and the Fine Guidance Sensor, being lifted from the vacuum chamber at Goddard Spaceflight Center. CV3 now complete. Late October to February Cooldown ~20 days Testing ~60 days Warmup ~15 days Instrument + Telescope integration complete. IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 18 18
19 ISIM Installation IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 19
20 JWST Optical Telescope Element Complete IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 20
21 Sunshield Full Deployment Test IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 21
22 Spacecraft Bus - Complete 22 IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 22
23 IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 23
24 OTE Optical Test at NASA Johnson IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 24
25 IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 25
26 Animations Telescope handling at Goddard hensejk1jkdjlg4hszmvokrgn9cd8 Post-launch deployments A4420&index=1 IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 26
27 Deployments backup video IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 27
28 JWST Solar System Observing JWST will fully support Solar System observations Costs approved through NASA Planetary Sciences Division (2008) Planets, satellites & rings (Mars outward) Asteroids, KBOs, and comets Non-sidereal tracking implemented Rates up to 30 mas/sec (108 /hr) for Cycle 1 (maybe higher for Cycle 2) Covers everything except fastest NEOs, comets Ephemeris represented as 5 th O polynomial, 0.4 mas accuracy Jitter ~7 mas over 1000 sec IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 28
29 JWST Field of Regard North Ecliptic Pole Continuous Viewing Zone North 135 Observatory thermal design defines the allowed Solar orientations Solar elongation 85 to 135 (like Spitzer, Herschel) Roll ±5 about line of sight 360 Continuous Viewing Zone South Solar System Targets: Observations occur near quadrature, not at opposition V1 V2 V3 JWST can observe the whole sky every year while remaining continuously in the shadow of its sunshield. Instantaneous Field of Regard is an annulus covering 35% of the sky The whole sky is covered twice each year with small continuous viewing zones at the Ecliptic poles IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry
30 JWST Instrument FOVs for Targets in the Ecliptic Plane PSF Orient PSF Orient V3 V1 V2 V2 Looking S. from NEP V1 V3 IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 30
31 JWST Instrumentation IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 31
32 Imaging Modes IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 32
33 JWST Imaging Modes Mode Imaging Aperture Mask Interferometry Coronography Instrument Wavelength (microns) Pixel Scale (arcsec) Full-Array* Field of View NIRCam* x 2.2 NIRCam* x 2.2 NIRISS x 2.2 MIRI* x 1.88 NIRISS NIRCam x 20 NIRCam x 20 MIRI x 24 MIRI x 24 MIRI x 24 MIRI x 30 IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 33
34 Spectroscopic Modes IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 34
35 JWST Spectroscopy Modes Mode Slitless Spectroscopy Instrument Wavelength (microns) Resolving Power (l/dl) Field of View NIRISS x 2.2 NIRISS single object NIRCam x 2.2 Multi-Object Spectroscopy NIRSpec , 1000, x 3.4 with 250k 0.2 x 0.5 microshutters Single Slit Spectroscopy Integral Field Spectroscopy NIRSpec , 1000, 2700 slit widths 0.4 x x x 1.6 MIRI 5.0 ~14.0 ~100 at 7.5 microns 0.6 x 5.5 slit NIRSpec , 1000, x 3.0 MIRI x 3.9 MIRI x 4.4 MIRI x 6.2 MIRI x 7.7 IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 35
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39 GTO CP release Jan06 GTO props due Apr01 DD-ERS initial CP release Jan06 DD-ERS Notices of Intent due Mar03 GO Cy 1 CP Nov30 GTO Cy1 obs release by Jun DD-ERS props due Aug18 DD-ERS final CP release May19 DD-ERS TAC Oct GO Cy1 props due Mar02 GO Cy1 TAC May 2018 launch 2018Oct commissioning (6 mo) cycle 1 Obs begin Apr 2019 JWST Science Timeline Current as of October 2016 IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 39
40 Moving Targets Observatory, Flight Software Non-sidereal tracking Implemented. Rates up to 30 mas/s (108 /hr) supported (max rate of Mars) Modeling shows excellent pointing stability (< 7mas NEA), ~same as fixed targets The moving-target is fixed in detector frame while exposing Dithers, mosaics supported (slightly higher overheads) ~1 mag brighter guide stars required for moving targets Long (~1hr+ tracks) possible while guiding continuously Longer observations possible using multiple guide stars IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 40
41 How Fast are Moving Targets Moving? JWST can track nearly any targets within its field of regard on any given day even NEOs and Comets. IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 41
42 Schematic for Moving Target Observation 1. Usable guide star selected from candidate list, identified in field normally 2. Slew from acquisition point to target ambush point computed and executed 3. Guide star position refined, system waits for tracking start time 4. Tracking begins: guide star and track subarray move across Fine Guidance Sensor 5. Science exposure starts 6. Science exposure ends; dithers, mosaics repeat this process Target acquisition (peak-up on target) uses the same process End of Ephemeris Acquired GS position 2 Slew to ambush point Commanded Guide Star position for ID/ACQ 1 Remove slew error 3 Dithers, mosaics 6 Science exposure ends 5 Science exposure starts 4 32x32 track box follows guide star GS positioned at ambush point Start of Guide Star Ephemeris IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 42
43 Fine Guidance Sensor Moving Target T FGS configuration FGS TRACK 32x32 track box (subarray) Saved image data Note hot pixels OSIM point source Moderate illumination steps mimic GS motion on FGS detector FGS FSW Centroids at 16 Hz FSW moves track box to follow guide star NOT quite the same as MT tracking... For MT tracking Box moves in manner prescribed by the ephemeris IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 43
44 Moving Targets Observatory, Flight Software Event-driven scheduling / operations Each target has many possible guide stars, useable during different windows At time of observation, 1 st usable guide star selected, acquired normally 5 th O Chebyshev representation of guide-star track Primarily enables guide-stars to be used at any time during target visibility window Secondarily allows tracking targets with ephemeris accelerations Time-constrained observations are supported IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 44
45 Guide Stars for Moving Target Observations Event-driven operations provide flexibility in use of Guide Stars for moving targets Multiple sets of guide stars defined to cover complete visit scheduling window Typically 3 guide stars for any time within visit scheduling window Up to 200 guide star candidates per moving target observation Observations with different instruments require separate guide stars (and visits) E L F Visit Nominal Visit Scheduling Window E L F Guide Star 1 Window Visit Start Time (event-driven): can use Guide Star 2 or 3 for tracking Guide Star 2 Window Guide Star 3 Window Guide Star 4 Window E = Earliest Start Time, L = Latest Start Time, F = Latest End Time (Finish) Guide Star 5 Window Guide Star 6 Window IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 45
46 Target Acquisition: NIRSpec NIRSpec TA for moving targets is not easy 1.6 square aperture Ephemeris of target must be accurate! Centroid calculated on-board Target can be accurately (<10mas) positioned in the IFU, any of the fixed slits, or in a pseudo long-slit in the microshutter array IFU Targ.Acq. Aperture Pseudo Long-slit 0.2 IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry 46
47 PASP Special Issue (Jan 4, 2016) Innovative Solar System Science with the James Webb Space Telescope Stefanie Milam, Special Editor 11 topical papers 1 high-level paper (Norwood et al.) 47
48 10 JWST Solar System Focus Groups (and 11 papers! Asteroids (Andy Rivkin, JHU/APL) Comets (Chick Woodward, U. Minnesota) Giant Planets (Jim Norwood, NMSU) Mars (Geronimo Villanueva, GSFC) NEOs (Cristina Thomas, GSFC) Occultations (Pablo Santos-Sanz, IAA-CSIC, Spain) Rings (Matt Tiscareno, Cornell) Satellites (Laszlo Kestay, USGS) Titan (Conor Nixon, GSFC) TNOs (Alex Parker, SwRI) JWST Solar System Capabilities (Milam, GSFC) 48 IAC Winter School 2016JWST Solar System Explorations - - J. Stansberry
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