October 6, 2013
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Japanese (translated by Yuichi Iga)
To Jupiter imagers: In the last few years, amateurs have recorded three fireballs in Jupiter’s atmosphere produced by impacts - two in 2010 and one in 2012. There may well be more impacts undetected on amateur videos. Now, free and easy-to-use software has been posted to allow you to scan your own webcam videos for fireballs. All observers who have taken, or will take videos of reasonable quality are urged to take part in the project, by using this software and reporting the results (positive or negative). You may discover a previously undetected impact, and you will certainly help to constrain the frequency of impacts, which will be useful scientific data. The software used, called “DeTeCt”, can work on all different types of videos or individual files that amateurs use (avi, wmv, ser... video formats; fits, tiff, bmp, jpg… file formats). It runs in a batch mode for processing in a row all videos found in a directory and its sub-directories, easing the processing of hundreds of acquisitions. Its development was launched by Dr Ricardo Hueso of the professional planetary team in Bilbao, with contribution from Emil Kraaikamp, but was extended for the project with additional functionalities by Marc Delcroix. You can find out all about it in Marc’s presentation to the recent European Planetary Science Congress, at http://www.astrosurf.com/delcroix/doc/EPSC2013/EPSC2013.htm or go straight to the project homepage for introduction, details, and downloading the software: http://www.astrosurf.com/planetessaf/doc/project_detect.shtml So far, 6 d 17 h of videos have been scanned, with no new detections - not surprising as the highest prior estimate of frequency was about one impact a week. These videos were mostly from French observers, with just one each from Australia, Greece, and Hawaii. So, there is everything to play for! This is a great project that you can set running on cloudy nights. You can scan all your archived videos from previous apparitions, and then scan new ones as you acquire them. Please note that it is essential to record all the videos scanned and report the results even if negative. The aim is to establish the frequency of impacts, not just to find new ones. We hope that you will take part in this exciting scientific project. best wishes, John Rogers & Marc Delcroix
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_______________________________ John H. Rogers, Ph.D. Jupiter Section Director, British Astronomical Association jhr11@cam.ac.uk http://www.britastro.org/jupiter/ _________________________________
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Detection of Jovian impact flashes with DeTeCt software
October 6, 2013
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_______________________________ John H. Rogers, Ph.D. Jupiter Section Director, British Astronomical Association jhr11@cam.ac.uk http://www.britastro.org/jupiter/ _________________________________
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【日本語訳:伊賀祐一 (Yuichi Iga)】 |