Re: Re: USA 179 Rocket (#28385) nicely flashing on a 5.8 sec period

From: Alain Figer (
Date: Tue Dec 17 2013 - 09:50:09 UTC

  • Next message: Björn Gimle: "Re: Re: USA 179 Rocket (#28385) nicely flashing on a 5.8 sec period"

    Many thanks, Björn.
    If I'm not wrong in my memories, I mean we already had such a conversation in the past - except that you didn't mention 'ObsReduce' then. And in that era I did use 'Calsky' to do such an analysis instead of 'ObsReduce'. [Now, I have to learn the functions of ObsReduce, that look as an exciting software]
    Yesterday I indicated a "rough" photometric period for USA 179 Rocket because I had not enough dedication to possibly get a better figure for the period from my series of photos. In fact, I intend to observe again this rocket ASAP - weather permitting - so as to get a new set of photos more appropriate to the aim of getting quickly an accurate period from them.
    By the way I wish to tell you that I managed to find - less than a year ago - a more efficient method (meaning: 'less time-consuming') for deriving accurate periods of flashing satellites from my photos.
    As a matter of fact, I definitely solved the problem caused by the TRUNCATURE TO THE SECOND of the times recorded by my Canon EOS 600D.
    Now I'm able to estimate - rather easily - the truncature value to THE TENTH OF A SECOND, so that I can wholly rely on the times recorded by my camera, hence without having to calculate any accurate orbit. 
    Message du : 16/12/2013 14:21
    De : "Björn Gimle " <>
    A : "Alain Figer" <>, "SeeSat" <>
    Copie à : 
    Sujet : Re: USA 179 Rocket (#28385) nicely flashing on a 5.8 sec period
    If the prediction (time and track) was close to reality, you can determine very accurate flash period by reducing the first and last minima (or maxima) in ObsReduce. 
    You won't know the times exactly, but the  "Obs-Pred Time" in the form, or "s late" or "s early" in the details files will improve them. 
    If the gaps between photos is too large for counting missing periods, reduce each photo separately, and if the periods are consistent enough you should be able to find the total no. of periods in your session.
    2013/12/16 Alain Figer <>
    .... I followed photographically USA 179 Rocket (2004-34B) nicely flashing.
    The photometric period - roughly determined - was of about 5.8 seconds.
    48.67N ; 2.13 E ; 170m a.s.l.
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