Yuri 3B one-power flashes, and some other obs

From: Ed Cannon (ecannon@mail.utexas.edu)
Date: Wed Feb 20 2002 - 04:57:01 EST

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    Earlier I found Yuri 3B (91-060A, 21668, a.k.a. BS-3B) with 
    binoculars and realized some flashes were quite bright.  I 
    tried and did see two of them without binoculars, somewhat 
    brighter than nearby iota Hydra (+3.9 according to HomePlanet), 
    at 5:50:12.0 and 5:52:27.8 Feb 20 UTC.  It was interesting 
    also because for a while (5:29:50.72 to 5:43:24.75) I could 
    see half-period secondary flashes, but in the middle of that 
    time I was not able to see it between 5:36:37.7 and 5:41:09.4!  
    Also, between 5:56:99.06 and 6:04:54.69 there seemed to be a 
    phase shift, as that time amounts to 3.5 cycles.  I saw three 
    more cycles after the phase shift but was then interrupted by 
    a passerby and his rowdy dog.  PPAS report up to phase shift:
    
    91- 60 A 02-02-20 05:56:59.0 EC 2849.8 0.3  21 135.70 mag +3.5->inv
    
    Location was E. Ney Museum grounds:  30.307N, 97.727W, 150m.
    
    Earlier, on my way home from work -- without my long-distance 
    glasses (i.e., with workplace glasses made for near vision 
    only, because I managed to go to work without any distance 
    vision glasses [uh, well, except for my prescription 
    sunglasses]) -- I saw several very bright flashes from 
    Iridium 24 (25105, 97-082B).  This was another occasion when 
    it was very irregular.  However, a few days ago I did get a 
    nice flash period for it as it was going away low in the 
    north, 14 consecutive flashes all mag. zero or brighter:
    
    97- 82 B 02-02-15 01:19:14.55EC  131.0 0.2  14  9.36  mag -2.0->inv
    
    With the same near-vision glasses I was also able to see
    Lacrosse 3 Rk (25018, 97-064B), Cosmos 389 Rk (04814, 
    70-113B), and a flare from Iridium 3 (25431, 98-048A)!  
    (With those glasses my limiting magnitude seemed to be about 
    +2.5.)  
    
    From several nights ago, here are a few flash timings of 
    99-503A (90003), a very interesting unknown drifting near-
    geosynch observed with Mike McCants' telescope:
    
    99-503 A 02-02-12 04:00:31   EC   84.7 0.3   4 21.2   asymm 2ndaries
    
    Here are four flash cycles which show the asymmetry:
    
    13.39, 7.71, 
    3.89, 9.56, 7.70
    13.49, 7.69, 
    13.47, 7.79
    
    I'm hoping to see some one-power ETS-6 (23230, 94-056A) 
    flashes later today (local time).
    
    I'm also planning to jump onto the flaring geosat 
    bandwagon soon!  As Kevin Fetter has said, we're in 
    flaring geosat or geosynch season, when operational 
    geosats can flare from five to possibly ten magnitudes 
    brighter than normal.  It should be going strong here 
    after the full Moon.  Some time ago I attempted to 
    construct a "schedule" for the February-April season, 
    based on Rainer Kresken's schedule for the 
    September-October season:
    
     http://www.satobs.org/seesat/Mar-2000/0107.html
    
    Ed Cannon - ecannon@mail.utexas.edu - Austin, Texas, USA
    
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