Posts
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VisualFitsBrowser Version 1.5 Released
I have released a new version (1.5) of the VisualFitsBrowser. It has a few improvement that should be useful: Some documentation in the GitHub wiki page Support to send multi-extension FITS files to ds9 as mosaic image iraf. Support to send several images to ds9. Just select several images in the table view and select File -> send all to ds9. All images will load, with frame, cmap etc locked between the frames. If there is no ds9 running already, double-click on the greyed out ds9 icon in the menu bar (right side). A new ds9 (if found) will be...
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Suppressing pupil ghost and other internal reflections in the WIYN One Degree Imager
Summary:Internal reflections in the ODI WIYN one degree imager produce undesirable ghost images. I outline a method to suppress those ghost by utilizing the shutter to block out most of the ghost rays.Formation of a pupil ghost in ODI images:Reflections of the optical surfaces within WIYN One Degree Imager (ODI) produce internal ghosting, i.e., flat fields1 or exposures of the night sky will produce an image of the telescope pupil. Thanks to anti-reflection coatings on the optics, each reflection is suppressed to about about 1%-2% level, depending on the actual wavelength of the light, but the residual light is still...
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VisualFitsBrowser Released
As part of the WIYN One Degree Imager software suite I developed a java tool that allows to look through all fits files in a directory, show some key header keywords in a list, and add a text comment to each file. Also, double-clicking on a file in the list will send that fits file to a ds9 fits viewer.I have released the source code and a runnable jar file on git hub. Please follow the instructions there. Documentation etc will follow swiftly (or so).~Daniel
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Monitoring Throughput Trends with the One Degree Imager and PPA
All images taken with the WIYN One Degree Imager are stored and calibrated within the ODI Pipeline, Portal, and Archive (PPA) system. Within PPA, the data are calibrated with a ODI quick reduce data pipeline; calibrated images and their metadata (basic information about where the telescope was pointed, but also photometric depth and other derived information) can then be searched and downloaded from the PPA system.This pool of metadata is a great tool to understand the long-term behaviour of the One Degree Imager. In the example here I analyze trends in the throughput of the telescope and instrument system over three years. Let’s get started:Extracting...