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Skip to main content Space Telescope Science Institute Close search Open search Search Search for news, events, etc. Search Method All These Words This Exact Phrase Any of These Words Advanced Do not include words like a, and, for, the, etc. Advanced Query Syntax Content Type Page News Newsletter Article Event Annual Report HST User Documentation JWST User Documentation File All Searchable Content Sort By Relevancy Score Date This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply. Menu Menu MAIN NAVIGATION STScI Home * Who We Are * STScI Annual Reports * Our History * STScI Timeline * Meet Our Director * Leadership * What We Do * Hubble Space Telescope * About * Key Science Themes * Solar System * Exoplanets * Stars and Their Environments * Galaxies * Cosmology * HST Scorecard * History * Key Individuals * Space Telescope Users Committee * Membership * Committee Reports * Presentations and Documentation * HST Repair Contingency Plans * Proposing * Phase I * Call for Proposals * Director's Discretionary Time Submission * Mid-Cycle Time Submission * Proposal Planning Toolbox * Exposure Time Calculator * Orbital Visibility and Scheduling * Peer Review Information * Phase II * Phase II Proposal Preparation * Phase II Proposal Instructions * Visit Size Recommendations * Guidelines and Documents * Approved Programs * HST / SOFIA * Observing * Scheduling * Activating Your Target of Opportunity * Observing Status * Program Information * Post-Observation * Data Analysis Toolbox * Exception Reports * GS ACQ Failed to Single Guide Star * Reporting Problems * Retrieving Data on MAST * Hubble Legacy Archive * Instrumentation * Advanced Camera for Surveys * Instrument Design * Performance * Anneal Dates * Anomalies and Artifacts * Dragon's Breath and Edge Glow * Guidestars * CTE Information * Post-SM4 Internal CTE for WFC * Photometric CTE Corrections * Pixel-Based CTE Corrections * Prism / Grism * WFC G800L * HRC G800L * HRC PR200L * SBC PR110L and PR130L * Proposing * ACS ETC * Dither Strategies * ACS-WFC-DITHER-LINE * ACS-WFC-DITHER-BOX * ACS-WFC-MOSAIC-LINE * ACS-WFC-MOSAIC-BOX * ACS-HRC-DITHER-LINE * ACS-HRC-DITHER-BOX * ACS-HRC-MOSAIC-LINE * ACS-HRC-MOSAIC-BOX * ACS-SBC-DITHER-LINE * ACS-SBC-DITHER-BOX * ACS-SBC-MOSAIC-LINE * ACS-SBC-MOSAIC-BOX * Exception Report Instructions * Data Analysis * Aperture Corrections * Distortion * DQ Flag Definitions * DrizzlePac * Pixel Area Maps * System Throughputs * Zeropoints * Photometric Transformations * Calibration * Calibration Plans * Reference Files * Software Tools * Analysis Tools * Calibration Tools * DrizzlePac * Documentation * ACS Instrument Handbook * ACS Data Handbook * Instrument Science Reports (ISRs) * STScI Analysis Newsletter (STAN) * Conference Posters * Shortcuts * ACS ISRs * ACS STANs * ACS Imaging ETC * ACS Spectroscopic ETC * ACS Ramp Filter ETC * HST Proposing * Phase I Proposals * Phase II Proposal * HST Cycle 30 Primer * Cosmic Origins Spectrograph * Instrument Design * Performance * Monitoring * Sensitivity * Spectral Resolution and Line Spread Functions * Proposing * COS2025 Policies * Observing Strategies * Wavelength Tool * Data Analysis & Software Tools * Calibration * Airglow * Cycle 28 Calibration Plan * Cycle 27 Calibration Plan * Cycle 26 Calibration Plan * Cycle 25 Calibration Plan * Cycle 24 Calibration Plan * Cycle 23 Calibration Plan * Cycle 22 Calibration Plan * Cycle 21 Calibration Plan * Cycle 20 Calibration Plan * Cycle 19 Calibration Plan * Cycle 18 Calibration Plan * Cycle 17 Calibration Plan * Cycle 29 Calibration Plan * Documentation * COS Instrument Handbook * COS Data Handbook * Instrument Science Reports (ISRs) * STScI Analysis Newsletter (STAN) * Exception Report Instructions * Conference Posters * CalCOS Release Notes * Notebooks * Fine Guidance Sensors * History * Instrument Design * Performance * Proposing * Data Analysis * Software Tools * Documentation * Space Telescope Imaging Spectrograph * Instrument Design * Apertures * Detectors * Filters * Gratings / Prism * Spectral Format Plots * Performance * Anomalies * Image Quality * Monitoring * Sensitivity * Spectral Resolution * Throughput * Background Noise * Proposing * GO Wavecal Aperture Selection * Observing Strategies * Target Acquisition * Spectroscopy * Imaging * Available Modes * High Contrast Coronagraphy at Small Inner Working Angles with BAR5 * STIS BAR5 * Data Analysis and Software Tools * Pixel Based CTI * Calibration * Documentation * Instrument Science Reports * STScI Analysis Newsletter (STAN) * STIS Instrument Handbook * STIS Data Handbook * Flux Recalibration * Wide Field Camera 3 * Instrument Design * Performance * Anomalies * CTE * Ground Testing * Monitoring * Complete Anneal History * Throughputs * Cal Subsystem * Proposing * Dithering Strategies * Data Analysis * Color Conversion Table * Full Well Depth * Grism Spectroscopy * IR Flats * Blob Delta-flats from Earth flat calibration images * IR Persistence * Photometric Calibration * UVIS Photometric Calibration * UVIS Photometric Zero Points * Quad Filter Photometry * UVIS Encircled Energy * IR Photometric Calibration * IR Encircled Energy * Pixel Area Maps * PSF * PSF Search * Retrieving Data * Should I Recalibrate? 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It summarizes the policies and procedures for proposing in that cycle of HST observing, including requests for funding research on archival HST data. It also provides an overview of HST's expected capabilities for that observing cycle, including information about the telescope and the available scientific instruments. Phase I Documentation and instructions to support writing and submitting a proposal for HST observing time. Read More Phase II Guide for providing the details to schedule and obtain HST observations after a Phase I proposal approval. Read More Approved Programs Results from current and past HST proposal cycles, including approved programs and abstract and exposure catalogs. 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