Pan-STARRS PY2 EOC Review #11-2 March 2004

UNIVERSITY OF HAWAII INSTITUTE FOR ASTRONOMYApproved for Public Release - Distribution is Unlimited

1

Pan-STARRS UH-IfA

Site Evaluation and Selection

R.J. Wainscoat - task manager

M. Waterson - Haleakala studies

M. Chun – Mauna Kea studies

Pan-STARRS PY2 EOC Review #11-2 March 2004

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Pan-STARRS UH-IfA 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

Pan-STARRS PY2 EOC Review #11-2 March 2004

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Pan-STARRS UH-IfA 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

Pan-STARRS PY2 EOC Review #11-2 March 2004

UNIVERSITY OF HAWAII INSTITUTE FOR ASTRONOMYApproved for Public Release - Distribution is Unlimited

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Pan-STARRS UH-IfA Climate Study

• Maui study (sub to KC environmental) 90% complete– Analysis of 5 year CAPS and summit weather

data archive by 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

Pan-STARRS PY2 EOC Review #11-2 March 2004

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Pan-STARRS UH-IfA Mean temperature and humidity

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CAPS Humidity Variation by Month (1998-2003)

CAPS Temperature Variation by Month (1998-2003)

Pan-STARRS PY2 EOC Review #11-2 March 2004

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Pan-STARRS UH-IfA Cloud cover from IR sensor

Sensitivity to cloud passage

Probability across entire year

Pan-STARRS PY2 EOC Review #11-2 March 2004

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Pan-STARRS UH-IfA ConCam

• Fisheye CONtinuous CAMera located on Mauna Kea

• NSF/Michigan State Univ. sponsored

• http://nightskylive.net• Unit for Haleakala to

be deployed Q204

Pan-STARRS PY2 EOC Review #11-2 March 2004

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Pan-STARRS UH-IfA 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

Pan-STARRS PY2 EOC Review #11-2 March 2004

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Pan-STARRS UH-IfA DIMM Instrument Locations

Maui DIMM tripodlooking toward future PS-1

UH 2.2m Coude Room

(at CTIO)

Pan-STARRS PY2 EOC Review #11-2 March 2004

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Pan-STARRS UH-IfA 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

Pan-STARRS PY2 EOC Review #11-2 March 2004

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Pan-STARRS UH-IfA 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

Pan-STARRS PY2 EOC Review #11-2 March 2004

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Pan-STARRS UH-IfA SHABAR details

Solar SHABAR instrument

Pan-STARRS PY2 EOC Review #11-2 March 2004

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Pan-STARRS UH-IfA 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

Pan-STARRS PY2 EOC Review #11-2 March 2004

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Pan-STARRS UH-IfA 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