tag:blogger.com,1999:blog-15164221.post9083345540496204846..comments2023-10-31T11:21:23.531+01:00Comments on SatTrackCam Leiden (b)log: The tumble period of the UNHA-3 upper stage from the recent North Korean launch is slowly changingSatTrackCam Leidenhttp://www.blogger.com/profile/08711764306071043709noreply@blogger.comBlogger6125tag:blogger.com,1999:blog-15164221.post-43015934297996777532016-03-08T17:29:28.953+01:002016-03-08T17:29:28.953+01:00Yep see your issue with Tiangong 1 never gets high...Yep see your issue with Tiangong 1 never gets higher than 15 degrees for Leiden. Our reason for asking from an observation of Tiangong 1 which was shot a couple of weeks back seems the station may be tumbling. We are going to try and image it again using a wider field lens to give longer arc of observation to see if this is truly the case. Also have a video camera being built with frame integration for exposures of up to 17 seconds which should be coming soon which will give us a better look at satellite candidates that maybe be tumbling which is our interest. Thanks Marco for the reply.Thomas Dormanhttps://www.blogger.com/profile/10161282484255591632noreply@blogger.comtag:blogger.com,1999:blog-15164221.post-80997087181912918182016-03-08T15:50:37.102+01:002016-03-08T15:50:37.102+01:00Tiangong 1 is not visible from my latitude (51 N)....Tiangong 1 is not visible from my latitude (51 N).SatTrackCam Leidenhttps://www.blogger.com/profile/08711764306071043709noreply@blogger.comtag:blogger.com,1999:blog-15164221.post-67600442375601956882016-03-08T15:39:59.755+01:002016-03-08T15:39:59.755+01:00Marco
If you should have the time could you have a...Marco<br />If you should have the time could you have a go at light curve for Tiangong 1 on a high pass if you have the chance.<br />Thank you<br />ThomasThomas Dormanhttps://www.blogger.com/profile/10161282484255591632noreply@blogger.comtag:blogger.com,1999:blog-15164221.post-52646573240443754282016-03-08T14:46:19.130+01:002016-03-08T14:46:19.130+01:00Marco
Here are links to two plot we made. The firs...Marco<br />Here are links to two plot we made. The first one shows the tumble of the North Korean KMS 3-2 satellite and the second is the plot of the stable Russian Okean 1-7 SL 14 rocket body though we are looking at them on very short arc. <br />KMS 3-2<br />http://vid284.photobucket.com/albums/ll34/skyflash_14700/KMS%203-2%20tumble%20Surface%20Plot_zpshlqnepi4.mp4<br /><br />OKean 1-7 SL14 R/B<br />http://vid284.photobucket.com/albums/ll34/skyflash_14700/OKean%20SL%2014%20Rocket%20Body1_zpsbjlzuucn.mp4Thomas Dormanhttps://www.blogger.com/profile/10161282484255591632noreply@blogger.comtag:blogger.com,1999:blog-15164221.post-13901830827605832082016-03-08T14:28:23.808+01:002016-03-08T14:28:23.808+01:00The only kind of correction I do, is applying a ru...The only kind of correction I do, is applying a running average (in this analysis: a 5-point running average). Effects of scintillation are usually of very short duration. It introduces scatter in pixel brightness values, and a running average smooths these out somewhat.<br /><br />With flash periods and flash durations of the kind in this analysis, scintillation imo is not really a problem, because the period and shape of the curve are at a timescale orders of magnitudes larger than the timescale of scintillation, in this particular case of the UNHA-3 rb.SatTrackCam Leidenhttps://www.blogger.com/profile/08711764306071043709noreply@blogger.comtag:blogger.com,1999:blog-15164221.post-33606949221299815712016-03-08T13:58:21.714+01:002016-03-08T13:58:21.714+01:00Marco
We were wondering are you doing any correcti...Marco<br />We were wondering are you doing any correction for atmospheric turbulence (scintillation) in your plots? If so how are you correcting for this effect? We are going at it a little different than you using Image J.We frame the track then averaging the image then doing surface plot to look for possible tumble of the satellite. One other possible way to get at atmospheric turbulence (scintillation) is to apply a deconvolution process to the image or in video images. Since we are dealing with some video brightness changes of the satellite causes by atmospheric turbulence (scintillation) become more apparent but even with still images the effects of atmospheric turbulence (scintillation) does play a roll in the dimming or brightening of the satellite. <br />We made some surface plots of your last UNHA-3 image and the tumble does show nicely. Marco thanks for explaining the process you using which will help us further refine our process.Thomas Dormanhttps://www.blogger.com/profile/10161282484255591632noreply@blogger.com