Re:DSP 23 in trouble

From: Greg Roberts (
Date: Wed Nov 26 2008 - 06:50:14 UTC

  • Next message: Greg Roberts: "Re: DSP-23 in trouble?"

    Good morning
    Ive just read the press release on the failure of DSP 23. 
    Maybe I am too much of a stikler for accuracy but, to 
    the best of my knowledge, there are one or two 
    inaccuracies in the report as follows:
    "several amateur astronomers had reported that 
    DSP 23, the last of the U.S. missile-warning satellites 
    built by Northrop, and launched in November 2007, had 
    stopped transmitting in mid-September."
    " some amateur astronomers, who use optical and 
    radio telescopes to track objects in space, suggested 
    the DSP satellite may have been adrift in 
    geosynchronous orbit, which could pose a danger to 
    other satellites operating in that orbit."
    As far as I am aware I was the first and only one to 
    identify that DSP F23 was not transmitting - see 
    SeeSat report "Optical-some-15 November 2008" 
    where I stated that I had received no signals a few 
    days earlier - the date of the radio observation was 
    actually 06 November 2008, so I would dearly like 
    to know who the "several amateur astronomers had
    reported that DSP 23 had stopped transmitting in 
    mid-September" are so that I can make contact with
    them so that the amateur radio network that tracks 
    classified satellites can be expanded.  As far as I
    know I am the only amateur observer that has optical
    AND radio capability for tracking geostationary 
    DSP F23 cannot be seen or heard from CONUS 
    so any observations would have had to come from 
    further east - ie Africa, Europe, UK etc and it 
    cannot be seen or heard from Australasia etc. To 
    the best of my knowledge there are only TWO 
    amateur optical observers in this region - Peter 
    Wakelin in the UK and myself in South Africa that 
    observe geostationary objects and Peter does not 
    have the radio equipment for the frequencies 
    required. All the amateur observations of this 
    object were made by Peter and myself, and as 
    pointed out in my previous posting the orbital 
    elements for this satellite showed that it started 
    drifting in mid-September 2008. 
    If I am incorrect in any of what I have written above
    I would WELCOME correction as I TRULY would 
    like to make CONTACT with the "several" and "some" 
    amateurs that had reported no signals from DSP F23. 
    Now back to measuring last nights observations :-))
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