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Selected PAIRITEL Data Analysis Issues Andrew Friedman (Harvard-CfA) afriedman@cfa.harvard.edu. www.pairitel.org. Outline 1. J K (JH) Transformations, Mosaics 2. Detecting Dither Problems 3. New Bad Pixel Masks 4. Priority Reduction Requests 5. Future Web Tools. J Band Mosaics: best quality
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Selected PAIRITEL Data Analysis IssuesAndrew Friedman (Harvard-CfA)afriedman@cfa.harvard.edu www.pairitel.org
Outline1. JK (JH) Transformations, Mosaics2. Detecting Dither Problems3. New Bad Pixel Masks4. Priority Reduction Requests5. Future Web Tools
J Band Mosaics: best quality – Most images included in mosaic H Band Mosaics: good quality – Most images included in mosaic – Better than K, but worse than J K Band Mosaics: poorest quality – In the past, sometimes fewer than half of images included in mosaic Why not use the J positions, relative image offsets to determine those for K (and H?)
Relative Image to Image Transformation Equations Rotation Matrices
JK Offset Rotation Angle vs. Zenith Angle JH Offset Rotation Angle vs. Zenith Angle • JK offsets independent of zenith angle • JH offsets depend on zenith angle (flexure) • Consistent with findings from 2MASS
Normal Dither Pattern Straying Dither Pattern • PTEL Dither pattern problematic ~Feb 10-14, 2006 • Multiple telescope control daemons conflicting
0.2% 1.2% 2.2% 2.5% 1.8% 2.3%
Web page with thumbnails of mosaic JPEGS. • List of reduced/unreduced data • Statistics for individual/all PAIRITEL projects • Automated e-mails sent to users with URL of such a page, notifications that data is ready • Suggestions?