Hi Marco, Last night I took a series of 6 consecutive photos in a field in Aquila. All photos were of 4 sec duration. In all the photos, a same flashpattern seems rather obvious : 1 bright maximum followed by 2 secondary maxima. At times both secondary maxima merge together. The brightest flash is very sharp and also variable in magnitude. It can be at times definitely fainter. I derived a photometric period of 0.73 sec, respectively : 0.727 ; 0.729 ; 0.728 ; 0.723 for the 4 photos with a complete 4-sec track. See for instance these 3 consecutive images - separated by about 1 second - here : http://www.flickr.com/photos/25296169@N07/6052688746/in/photostream http://www.flickr.com/photos/25296169@N07/6052161681/in/photostream/ http://www.flickr.com/photos/25296169@N07/6052731802/in/photostream/ They are enlargements of a small part in the original photos. The original photos cover the same larger part of the sky. Regards Alain Figer 48.67 N 2.13 E 170m ASL ======================================== Message du : 15/08/2011 De : "Marco Langbroek " <marco.langbroek@wanadoo.nl> A : "satelliet lijst (SeeSat)" <SeeSat-L@satobs.org> Copie à : bram.dorreman@skynet.be, ralf.vandebergh@home.nl Sujet : Nanosail-D flash pattern, and images of yesterday Hi all, For those interested: Widefield images of yesterday evening's fine Nanosail-D (10-062L) pass and a brightness variation curve derived from one of these images, have been posted here: http://sattrackcam.blogspot.com/2011/08/nanosail-d-flashing-rapidly-and.html Flash timings from the image in question: image s14082011_9 14 Aug 2011, 20:51:17.30 - 20:51:27.35 UTC flash times (UTC): 20:51:17.39 20:51:17.89 20:51:18.15 20:51:18.42 20:51:18.90 20:51:19.17 20:51:19.63 20:51:20.40 20:51:20.83 20:51:21.14 20:51:21.40 20:51:21.88 20:51:22.13 20:51:22.62 20:51:22.86 20:51:23.32 20:51:23.79 20:51:24.06 20:51:24.35 20:51:24.81 20:51:25.49 20:51:25.72 20:51:26.22 20:51:26.63 20:51:26.91 20:51:27.17 The other images were too saturated (trail too bright). Flash interval is wildly variable, between 0.23-0.77 seconds, with an average 0.39 +- 0.14 seconds. The curve from this image is quite nice, with sharp peaks. - Marco ----- Dr Marco Langbroek - SatTrackCam Leiden, the Netherlands. e-mail: sattrackcam@wanadoo.nl Cospar 4353 (Leiden): 52.15412 N, 4.49081 E (WGS84), +0 m ASL Cospar 4354 (De Wilck): 52.11685 N, 4.56016 E (WGS84), -2 m ASL SatTrackCam: http://home.wanadoo.nl/marco.langbroek/satcam.html Station (b)log: http://sattrackcam.blogspot.com ----- _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-l -------------- next part -------------- An HTML attachment was scrubbed... URL: http://mailman.satobs.org/mailman/private/seesat-l/attachments/20110817/326c9693/attachment.html _______________________________________________ Seesat-l mailing list http://mailman.satobs.org/mailman/listinfo/seesat-l
This archive was generated by hypermail 2b29 : Wed Aug 17 2011 - 11:50:10 UTC