Dear orbit people, We have been computing meteoroid orbits at ESA recently using the excellent JPL SPICE toolkit (cf. http://naif.jpl.nasa.gov and Detlef's...
Folks, we currently have the ISSI Meteor Workshop in Bern - some good discussions already! During the discussions we brought up a point which we had discussed...
Hi Laffy, ... the timer interrupt runs at 18.2 HZ - I guess that is what you are referring to. This is a BIOS interrupt (int 08) and therefore independent of...
Hi all Time accuracy is very complex problem especially on Windows system. The major time value source for meteor observation on windows are following 4...
Hello Detlef, ... I use a VideoTimeInserter (VTI) which was built by Sven Andersson in Berlin for my minor planet occultation work. It uses a Garmin GPS 18x...
Clearly if you only update every 2 hours you may have a drift larger than 100 ms - do you know the drift? TimeMemo should display it... So far I was using a...
Hello Detlef, ... if the computer had internet access I could know ... From my former manual adjustments it was less than 1 sec in 1 week. In the MetRec...
Bernd, ... night ... x.y sec. ... currently the correction is only listed if it's larger than 1s. However, I'm still aksing myself what millisecond accuracy of...
Bernd wrote > ... the number of received satellites (second row, last digits: S05, that means five satellites). It is great. Thank you for introduction. Here...
In my opinion, with the current data quality an absolute accuracy of milliseconds is not required. However, we were worried here at the workshop that some code...
Hi SonotaCo, ... I still do not understand: The ground track is obtained from the intersection of two or more planes obtained from meteors of different...
Hi Sirko and dvk Sirko> ... Yes. ... Almost exactly. ... No. A ground track is computed from the location of stations and the planes. The momentary geocentric ...
hi, thanks you all for you valuable comments. i have started this discussion with detlef koschny about relative time precision of my video observation. i use...
Hi SonotaCo, let's continue on this, as I'm still not convinced. ;-) ... the geocentric meteor position is independent from the time. Once the field of view of...
Hi juraj ... Time stamp of UFOCapture is not the imaged time by the ccd but the time when the frame is processed by windows software. Therefore the time stamp...
Hi Sirko ... really? :-) ... In my way of thinking, it is independent from time in the geocentric equational coordinates. But is not in the geographical...
Our s/w person Hans did some testing and thinks that the Windows clock is updated more frequently, about 16 ms. See below a mail from him to me. He now (in the...
Here I refer again to the time inserter testing by Dangl.at, Rolf Apitsch, and myself (go to http://tko.koschny.de and click on 'Time measurements' on the left...
Sirko, maybe another way of thinking about this is in terms of absolute accuracy. The RA/Dec gives the direction to the meteor. But if I have a time error of 1...
Oh, this WG burns up suddenly (@_@). It did not take days to answer, I believe I came to an conclusion. Again I quote Sirko's message ... Now I know, this is...
Our orbit code (MOTS 2.0) does not use the absolute time. But I maintain that if you have an error in the time of the meteor, the absolute position will be...
Hi Laffy, I hope you don't mind if I disagree once more. I think this issue should be discussed out until we all come to an agreement. Ok? It's always good to...
Hi SonotaCo, what do you mean by geocentric equatorial coordinates: The origin of that coordinate system is the center of earth, but how are the x/y/z axes...
Hi Sirko ... Oh, geocentric equatorial coordinates(I believed this is very common) origin : center of the earth x: ra = 0 deg,dec = 0 deg (equinox) y: ra = 90,...
Hi Sirko, no I don't mind - this is a discussion forum and I may be wrong also or I may not made have made myself clear enough ;-) Yes I agree that an accuracy...
Hi all I confirmed what was talked here. If you use only alt/az for ground trajectory computation, you can get single ground trajectory independently from...
SonotaCo, I looked at your link but I am not sure if I understand correctly. I would assume that also for alt/az the problem with time errors of one station...
