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Space Telescope Science Institute

JWST S&OC

JWST S&OC Contract

Peter Stockman

TIPS March 20, 2003

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Space Telescope Science Institute

JWST S&OC

S&OC Proposal

• 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

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Space Telescope Science Institute

JWST S&OC

Status of negotiations (began Jan. 15)

• 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.

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Space Telescope Science Institute

JWST S&OC

Key Assumptions

• 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 fixed-position 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.

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Space Telescope Science Institute

JWST S&OC

More Key Assumptions

• 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.

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Space Telescope Science Institute

JWST S&OC

Many Miscellaneous

• 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)

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Space Telescope Science Institute

JWST S&OC

Current Status

• Technical aspects of contract appear to be satisfactory to NASA

• 2-3 week period to acquire needed signatures

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Space Telescope Science Institute

JWST S&OC

Replan Status

• 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.

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Space Telescope Science Institute

JWST S&OC

SWG & Project Studies

• 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