Hubble Space Telescope Brad Whitmore 25 April 2012.

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Presentation transcript:

Hubble Space Telescope Brad Whitmore 25 April 2012

Mission duration – 22 years and counting Userbase – 3923 unique authors/co-authors in 2011, > 10,000 registered archive users Archive data volume – 60 Tbytes Instruments – Currently 5, 12 over 22 years (ACS, COS, FGS, HSP, GHRS, FOC, FOS, NICMOS, STIS, WFPC1, WFPC2, WFC3) Wavelength coverage – microns Program model – GO, GTO, AR + Theory Proposals/cycle – > 1000 lately Users/cycle – 1200 – 1300 per year, 5322 over life of mission Funding model – GO grants Default proprietary period – standard:1 year - DD, treasury: 0 Implementing Portals of the Universe, April

Proposal Process (e.g., Types of Proposals) A diverse range of proposal types support a robust science program. Left to it’s own devices, proposal pressure (~10-to-1 oversubscription) leads to a large number of small proposals, making it impossible to do some of the most important science. We use several techniques to counteract this tendency (e.g., Treasury proposals, TAC subsidies, creative use of DD time) and to maximize science (e.g., shortened proprietary time for Treasury, emphasis on High Level Science Products and legacy value of datasets). Proposal types include: GOTarget of Opportunity GTO (Guaranteed Time Observers) Archival (Regular and Legacy) LargeTheory TreasuryDirector’s Discretionary Multiple-Cycle Treasury (Cycle 18-20)Special Calibrations SnapshotJoint proposals (e.g., Spitzer) Parallel Argues for diversity of proposal types, as appropriate for different missions.

Instrument Calibration and Characterization Instrument scientists are active research astronomers (self motivated to optimize their own science and hence the communities science at the same time, produce the best possible reference files, develop new modes, …). Scientists are embedded in the instrument teams along with data analysts and programmers. Information is communicated in a variety of ways: 1) Instrument Handbooks, 2) Data Handbook, 3) team web pages, 4) electronic newsletter, 5) AAS meetings, 6) calibration workshops, … Examples of contributions, new modes, techniques: Diagnostics and correction of spherical aberration (Burrows) Deconvolution methods (before spherical aberration was fixed – White, Hanisch) Hubble Deep Field, Ultra Deep Field (Ferguson, Williams, …) NICMOS photometric non-linearity (Riess) Drizzle (combination of images), multidrizzle, astro-drizzle (Fruchter, Hooks) WFC3 built by “Integrated Team” with strong involvement of STScI staff CTE mitigation (pixel-to-pixel reconstruction – Anderson) Misc - Spatial scans (Mackenty), recovering magnitudes for “saturated” stars (Gilliland), new levels of astrometric accuracy (Anderson)… Argues for active research staff with commitment to making improvements for the astronomical community.

Calibration Pipeline and Archives The development of the HST calibration pipeline, and a general-use, quick- access archive, changed the paradigm of how astronomers work. By reducing redundancy, improving uniformity, and using the latest calibration software and reference files, observers can focus on the analysis and interpretation of the data rather than the routine reductions. Archival progression: Basic reductions (flat fields, bias subtraction, …) Combining data (drizzle, multi-, astro-drizzle, mosaics, color …) Removing artifacts (cosmic rays, ACS bias stripes, CTE trails, …) Multi-mission Archive at Space Telescope (Multi-wavelength) Easy access, value-added (Hubble Legacy Archive, footprints, …) Emphasis on legacy value, High Level Science Products (HLSP) VAO compatibility (prepare for several decades, not just next year) Argues for continual evolution, from simply controlling the bits to value- added products and tools leading to the enhancement of science.

Documentation When we started, there was no internet. A simple paper document, sent out to users on request, was sufficient. With the explosion of the information age, we have new challenges (multiple sources of information, need for quick updating of information, compatibility with constantly changing media, predicting the future, …) Goal might be to make a single change/update and have it propagate to: Paper version HTML and pdf versions Web pages (e.g., instrument teams) Wiki Help desk reference base (e.g., FAQ) Hand-held electronic media (e.g., ipod, i-books, …) JWST questionnaire at AAS meeting suggests that people may be ready for all electronic? Argues for keeping pace with how astronomers (and society) get their information, and being cognizant of future trends.

Nothing identified at present.

1.Modernize user support using new internet technology. 2.Path forward on science software is unclear (e.g., IRAF support, IFUs for JWST). 3.Value-added archival products and tools should have high priority (e.g., High Level Science Products, Discovery Portal, …). 4.Predicting the future will be important (internet evolution, cloud computing, documentation, …). 5.Hybrid model for grant support being considered for JWST (i.e., a combination of an Financial Review Committee (FRC) and formulaic approach for different types of proposals). 6.More extensive, more direct feedback from users (larger role of Users Committee, town meetings, webinars, more effective surveys, questionnaires at AAS meeting). What works best? 7.Continually reexamining and looking toward the future (e.g., 2 nd Decade Committee >> WFC3/IR, Treasury programs, …).