RE: Flashing period of Ajisai (object 16908) at about 2.2 seconds

From: Derek C Breit (breit_ideas@poyntsource.com)
Date: Thu Sep 22 2011 - 17:08:11 UTC

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    Forgive me in advance.. I know nothing of flash period observations..
    
    Consider this as a question..
    
    
    
    Define visually.. Doesn't match what I can see with the binocsulars.
    
    Doesn't agree at all with what I have videoed and posted to my website..
    
    See everything titled EGP on..
    http://www.poyntsource.com/New/Gallery.htm
    
    Scroll to the bottom.. Two Movies, 5 stacked JPG's ..
    
    Question.. Does the 2.2s period fit with the two times EGP "goes off"
    (blinking madly)in the "Disco Ball in Space"?? 
    
    That's the only pattern I have seen in EGP.. and with close inspection it is
    more than two times as it ramps up and ramps down as it passes the same
    azimuth as the Sun..
    
    
    If it is desired to have images that can determine both the speed and the
    flash pattern, let's talk because I could acquire them for you..
    
    Derek
    
    
    
    
    -----Original Message-----
    From: seesat-l-bounces+breit_ideas=poyntsource.com@satobs.org
    [mailto:seesat-l-bounces+breit_ideas=poyntsource.com@satobs.org] On Behalf
    Of Leo Barhorst
    Sent: Thursday, September 22, 2011 9:44 AM
    To: SeeSat-L@satobs.org
    Subject: Re: Flashing period of Ajisai (object 16908) at about 2.2 seconds
    
    The photo IMG_3518 perfectly shows what can be seen visualy.
    Three flashes and then 1 missing.
    See PPAS for more obs.
    
    Greetings,
    Leo Barhorst
    
    -----Oorspronkelijk bericht----- 
    From: alain.figer@club-internet.fr
    Sent: Thursday, September 22, 2011 3:36 PM
    To: Seesat-L ; Bram Dorreman
    Subject: Flashing period of Ajisai (object 16908) at about 2.2 seconds
    
    Hi all,
    On sept 14th, I took 2 series of photographs of the nice flashing satellite 
    Ajisai (EGP) 1986-61A, while it passed by Beta Ophiuci (21h04.5 UT) then by 
    Eta Scuti (21h06.6 UT). At first glance, the flashing pattern varies 
    significantly, because a lot of flashes are either missing or visible, 
    however it was rather easy to discover  that a same pattern is repeating 
    every 2.2 seconds or so. The accuracy on this photometric period (2.2 plus 
    or minus 0.15 second) was limited by a 'rough' calculus of the angular speed
    
    of the satellite. I couldn't measure it directly on the photographs as usual
    
    (each pic being of 4 second exposure time) because only dots are visible so 
    that I cannot define accurately the very beginning and the very end of the 
    4-sec track. Otherwise it would be easy to guarantee a period at 0.01 sec, 
    due to the sharpness of the dots.
    I issued as examples, 2 such photos on my Flickr's site :
    http://www.flickr.com/photos/25296169@N07/6169044892/in/photostream
    http://www.flickr.com/photos/25296169@N07/6169044856/in/photostream/
    
    Alain Figer, France
    2.128 E  ; 48.673N  ; 170 m asl
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