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Site Evaluation and Selection

Site Evaluation and Selection. R.J. Wainscoat - task manager M. Waterson - Haleakala studies M. Chun – Mauna Kea studies. Site Selection Objectives. Make scientific case for final location of PanSTARRS Determine environmental parameters for facility design

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Site Evaluation and Selection

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  1. Site Evaluation and Selection R.J. Wainscoat - task manager M. Waterson - Haleakala studies M. Chun – Mauna Kea studies UNIVERSITY OF HAWAII INSTITUTE FOR ASTRONOMY Approved for Public Release - Distribution is Unlimited

  2. Site Selection Objectives • Make scientific case for final location of PanSTARRS • Determine environmental parameters for facility design • Determine environmental and climatological factors affecting scheduling, operations and science • Develop documentation for EIS UNIVERSITY OF HAWAII INSTITUTE FOR ASTRONOMY Approved for Public Release - Distribution is Unlimited

  3. Study areas • Climate study • Analyze existing weather data archives to compare seasonal and mean overall conditions for impact on facility and operations • Sky Transparency and clear fraction analysis • Locate ConCam all-sky camera units at both mountains • Seeing measurements • Simultaneous observations on both mountains with DIMM telescopes, comparison with extant seeing data • Light Pollution analysis • Digital imaging of night sky to determine extent • Quantitative comparison of Haleakala with Mauna Kea • Lunar SHABAR measurements • Probe of boundary-layer seeing effects UNIVERSITY OF HAWAII INSTITUTE FOR ASTRONOMY Approved for Public Release - Distribution is Unlimited

  4. Climate Study • Maui study (sub to KC environmental) 90% complete • Analysis of 5 year CAPS and summit weather data archiveby year and month/season • Base weather synopsis • (Wind, temperature, humidity, rainfall) • Cloud cover estimate from IR sensor ( + day from solar flux as a check) • Boundary-layer height • Synoptic seeing from AHAC DIMM data UNIVERSITY OF HAWAII INSTITUTE FOR ASTRONOMY Approved for Public Release - Distribution is Unlimited

  5. Mean temperature and humidity CAPS Humidity Variation by Month (1998-2003) CAPS Temperature Variation by Month (1998-2003) UNIVERSITY OF HAWAII INSTITUTE FOR ASTRONOMY Approved for Public Release - Distribution is Unlimited

  6. Cloud cover from IR sensor Probability across entire year Sensitivity to cloud passage UNIVERSITY OF HAWAII INSTITUTE FOR ASTRONOMY Approved for Public Release - Distribution is Unlimited

  7. ConCam • Fisheye CONtinuous CAMera located on Mauna Kea • NSF/Michigan State Univ. sponsored • http://nightskylive.net • Unit for Haleakala to be deployed Q204 UNIVERSITY OF HAWAII INSTITUTE FOR ASTRONOMY Approved for Public Release - Distribution is Unlimited

  8. Seeing measurements • 2 CTIO/Gemini DIMM instruments available for first half of 2004 • 2 aperture system using 10" Meade, SBIG ST-237 camera • Operators trained and running 3 full nights/wk from mid-Jan • Limited data to date UNIVERSITY OF HAWAII INSTITUTE FOR ASTRONOMY Approved for Public Release - Distribution is Unlimited

  9. DIMM Instrument Locations UH 2.2m Coude Room Maui DIMM tripodlooking toward future PS-1 (at CTIO) UNIVERSITY OF HAWAII INSTITUTE FOR ASTRONOMY Approved for Public Release - Distribution is Unlimited

  10. DIMM Data 20 Jan - 13 Feb 2004 • Fewer Maui points: • Rain/fog (3 nights) • Wind buffeting • Feb16-20 data to be added • 8 of 12 nites red Wx (both sites) • Work underway tocorrelate with AHAC DIMM UNIVERSITY OF HAWAII INSTITUTE FOR ASTRONOMY Approved for Public Release - Distribution is Unlimited

  11. Lunar SHABAR • SHAdow-BAnd Ranging - measurement of height-resolved seeing • Uses an array of scintillation detectors illuminated by an extended object • Developed for Solar use (J Beckers, 2002) • Kaiser/Kuhn analysis extends technique to Lunar illumination • Prototype sensor unit being built on Maui • Will provide ~meter-resolution probe of boundary layer to several hundred meters • -> boundary height impact on PS1, seeing scale data for tuning OT performance UNIVERSITY OF HAWAII INSTITUTE FOR ASTRONOMY Approved for Public Release - Distribution is Unlimited

  12. SHABAR details Solar SHABAR instrument UNIVERSITY OF HAWAII INSTITUTE FOR ASTRONOMY Approved for Public Release - Distribution is Unlimited

  13. Light Pollution • Light pollution impact expected to be worse on Maui (more people closer) • No definitive measurements to date • Plan to acquire wide-angle digital images of horizon over 3 week periods at both sites • Process to determine quantitative background levels • ConCAM data should provide further info UNIVERSITY OF HAWAII INSTITUTE FOR ASTRONOMY Approved for Public Release - Distribution is Unlimited

  14. Updated Milestones • Jan 04 DIMM runs started • Jun 04 Seeing data collection complete • Mar 04 Climate study complete • Feb- Mar 04 Shabar prototype tests • Apr-Jun 04 Shabar data collection • Mar-Apr 04 Light-pollution measurements • Jul 04 Site Report • Jun – Nov 04 EIS studies • Nov-Jan 05 Final site trade study & selection UNIVERSITY OF HAWAII INSTITUTE FOR ASTRONOMY Approved for Public Release - Distribution is Unlimited

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