Gorizont 23 (Re: Gorizont 16 flashing)

From: Kurt Jonckheere (kjon@yucom.be)
Date: Mon Jun 04 2001 - 02:14:01 PDT

  • Next message: Bjoern Gimle: "Re: Gorizont 16, continued"

    hello Jason and others,
    
    Jason wrote
    > I did also look for Gorizont 23, which lay within a few degrees of
    Gorizont
    > 16 , but this was totally invisible with my instrument (limiting magnitude
    > under the conditions of perhaps mag+10). Does anyone have any observations
    of
    > this geoflasher during the summertime - I have the impression that it is
    > generally brightest during the winter / spring?
    
    Michel Jacquesson reported on 22 May :
    <    GORIZONT 23 (21533U 91046A) :
    <       - I saw it on 12 May with my C8, very faint :
    <         91- 46 A 01-05-12 23:15 MJ 714.9 0.2 23 26.42 F'aF'; mag 12-13,sp
    <     - last Friday, Saturday, Sunday and Monday, I did not see it, although
    the sky was very clear and no moon
    
    I also tried Gorizont 23 (21533 = 91- 46 A) several times during May in the
    evening
    (around 21 - 22 h UT) when it was over Europe, but never saw it with a
    limiting
    magnitude of between 9 and 11.
    
    Most of the time this Gorizont is an easy target flashing till mag +5 or so,
    but
    sometimes it becomes fainter.  The following is an overview of its
    brightness
    during the last years which may suggest that it is faint somewhere between
    May
    and July, but this needs to be verified in the coming weeks...
    
    I saw it flashing brightly with binoculars on 8 May 1997 and 22 Sep 1997.
    I didn't had my Dobsonian by that time and didn't note when I missed it.
    From Dec 1997 I have more details :
    
    16 Dec 1997 : 17h30m : +5.5
    16 Dec 1997 : 19h17m : +8.5
    
    17 Feb 1998 : 18h30m : +5
    
    4 May 1998 : 20h50m : +5
    
    23 July 1998 : 21h20m : +8.5
    
    28 Feb 1999 : 01h50m : +4.5
    03 Mar 1999 : 19h40m : +5.5
    06 Mar 1999 : 21h18m : +6.5
    
    2,3,4,6,8,12 May 1999 : 21h - 22h : +5 till +6
    15 May 1999 : 21h00m : fainter than +7 (nothing seen)
    
    16 July 1999 : 21h35m : fainter than +10
    18 July 1999 : 22h45m : fainter than +10.5
    24 July 1999 : 21h15m : fainter than +9.5
    
    10 Dec 1999 : 18h15m : +5
    
    26 Feb 2000 : 20h00m : +5.5
    28 Feb 2000 : 18h40m -> 19h 20m : +10 -> +12
     (Phase Shift around 19h13m)
    28 Feb 2000 : 21h03m -> 21h33m : +6
    4 Mar 2000 : 19h15m : +6
    
    23 Feb 2001 : 23h00m : +5.5
    3 Mar 2001 : 22h00m : +9
    
    10,11,12,16,23 May 2001 : 21h-22h : fainter than +10
    
    Kurt (observing from 51 North, 3 East)
    
    
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