Space Telescope Science Institute
JWST S&OC
JWST
S&OC Contract
Peter Stockman
TIPS March 20, 2003
1
S&OC Proposal
Space Telescope Science Institute
JWST S&OC
•
Original Proposal submitted November 2001
 Proposed cost comparable to unsolicited proposal, (330M w fee over
10 years)
 Project internal estimate: 140M (based largely on SMEX & MIDEX PI
missions, inexpensive flight ops systems)
 Extended review of proposal assumptions with Project in spring
•
Revised proposal submitted on schedule (16 Sept.) to meet 176M
target. Reductions achieved by the following assumptions:
•
Govt. provides groundstations -- probably DSN
•
Govt. provides I&T test system as basis of flight operations
ground system (STScI was to provide originally)
•
Govt. provides SI, OTE, S/C flight ops analysts for launch + 1 yr
•
Just-in-time development schedule (no phased development to
support SI, OTE, S/C dev.)
•
No operations or science I&T support for SI, OTE, S/C.
•
Reduced support to Project and SIs but w. overguides
2
Status of negotiations (began Jan. 15)
Space Telescope Science Institute
JWST S&OC
•
Contract negotiations began in mid January
 Project puts back: management oversight, Project support,
special studies, PRD Ops. (~ 5M) and fenced these costs off.
 Project poses a new Target of 159.5 (without fee)
 AURA can meet new Project target:
• STScI roles are reduced significantly compared to HST (and
Chandra and SIRTF experience)
» SI support
» Commissioning planning for SIs and spacecraft.
» Calibration software
» Calibration analysis
•
Assumes TRW develops I&T system near that needed for
flight ops.
•
Reduced planning system capabilities: no linked
observations, routine scheduling of parallel calibrations,
manual planning of the weekly calendar
Late GO funding for Cycle 1 (Grants office startup delayed)
•
•
Contract will be revised after results of replan: reduced
instrument complement?, delayed schedule.
3
Key Assumptions
Space Telescope Science Institute
JWST S&OC
• SI s: The three JWST instruments will have the
capabilities and complexity outlined in the ASWG
and Project Scientists recommendations. In
particular:
-
-
The NIRCam will be a wide field, infrared camera with a
limited set of fixed-band filter combinations (<20) and several
elements used exclusively for wavefront-sensing.
The NIRSpec will be a multi-object, single-order spectrograph
with addressable apertures and a small number of fixedposition gratings (< 6).
The MIRI will have two elements: a camera with a small
number gratings and potentially a fixed pupil mask and Lyot
stop for coronagraphy; a slit spectrograph with R ~1500 and a
small number of fixed-position gratings.
All three instruments will have a single target acquisition
mode (including PEAKUP and/or PEAKDOWN). All three
instruments will have a small number of common readout
schemes (<3) and a common data format.
4
More Key Assumptions
Space Telescope Science Institute
JWST S&OC
• The S&OC systems will not support parallel activities.
These include parallel calibration, pure parallel or
coordinated parallel observations and parallel modes
within instruments. Level 2 requirement 3.2.15.4 is
applicable to the Observatory.
• The Fine Guidance Sensor will be sufficiently capable
to enable guide star availability and selection to be
done in an automated fashion by the S&OC. This
assumes a wide field, highly capable guider that can
satisfy the Level II requirement (3.2.15.2.2) for the 95%
probability of guide star acquisition.
5
Many Miscellaneous
Space Telescope Science Institute
JWST S&OC
• The peak flight to ground data rate will be 25 GB/day.
• Level 1 data products will be available at L+3 months.
Level 2 data products will be available at L+6 months.
• Targets of Opportunity are not supported within the
time period of this contract.
• Etc. (about 70 such assumptions)
6
Current Status
Space Telescope Science Institute
JWST S&OC
• Technical aspects of contract appear to be
satisfactory to NASA
• 2-3 week period to acquire needed signatures
7
Replan Status
Space Telescope Science Institute
JWST S&OC
• Challenge was to meet:
 Stringent budget limits in FY04-07
 Launch date as close as possible to 2010
 Overall cost of 1.6B
• NASA HQ has settled on Option 4i
 Launch in August 2011
 About 110M cut in US instruments (down from ~ 160M)
• No MIRI
• 1/4 of NIRCam FOV, 1/8 NIRSpect FOV
 Reduced primary mirror area (but meets spec)
 Reduced testing plan
 Challenged Project to save 40-50M in other areas to help
restore instruments.
8
SWG & Project Studies
Space Telescope Science Institute
JWST S&OC
• SWG considering merging NIRCam and Canadian
FGS:
 Potential saving of accommodations (mass, computer)
 Elimination of short wavelength tunable filter
 Shared electronic and detector procurement
• Project finding it difficult to achieve matching
savings
• Other possibilities:
 Loss or reduced short wavelength performance.
 Increased role for ESA in MIRI
• Emergency meeting for SWG in April 10,11
9