Re: Gorizont 14 - Bright geoflasher accelerating?

Kurt Jonckheere (kjon@mail.dma.be)
Tue, 21 Sep 99 23:30:27 PDT

hello Jason,  Tony and others,

the most recent updates to the PPAS 8 volume, have NOT
(yet) been added to the online PPAS because I've some problems
with uploading them.  Maybe Mike McCants already has a zip-file
available containing all of them at his site ?

You can get the most recent updates by :
Send a message with Subject: archive get ppas8/ppas8-02.obs
  to SeeSat-L-request@lists.satellite.eu.org for the last update to PPAS 8, containing all
  new PPAS-observations.
Send a message with Subject: archive get ppas8/ppas8-01.obs
  to the same address for the First update to PPAS 8

The complete list of all obs of Gorizont 14 = 87- 40 A = 17969 :
(so Tony, your obs is surely in!, see also the program.ro on :
http://www2.satellite.eu.org/sat/program.ro )

I hadn't looked at this data in detail before, but it is clear that
there are indeed some (small) increases and decreases of the
period during one year of observations, as has been noticed
with other Gorizont before.
(see Gorizont 23 : http:// bewoner.dma.be/kjon)

To be followed closely !

87- 40 A 98-03-27 12:05      AB                85.0   peak flashes to mag +3
87- 40 A 98-03-27 12:05      AB                85.0   peak mag +3
87- 40 A 98-03-28 12:00      AB                84.92
87- 40 A 98-09-20 05:55      MM             57 87.33  T=4977.8, mag4for80min
87- 40 A 98-09-24 05:49:48.8 RM        .15  45 87.320 T=3929.4, mag +5->inv
87- 40 A 99-01-12 06:00:55.2 RM        0.2  31 85.155 T=2639.8,mag+5.5->inv
87- 40 A 99-01-14 06:11:16.4 RM        0.2  54 85.116 T=4596.25,mag+5.5->inv
87- 40 A 99-02-16 03:20      DD             11 84.8   mag +5
87- 40 A 99-02-17 03:11      GC                84.6   date? mag max +4, sm
87- 40 A 99-02-20 04:52:11.6 RM        0.2  51 84.792 T=4324.4,mag+5->inv
87- 40 A 99-02-21 05:40      RIK       1.0  26 84.77  T=2204,mag 5-> 12-14
87- 40 A 99-02-23 06:08:38.0 RM        .15  64 84.780 T=5425.95,mag+4.5->inv
87- 40 A 99-02-24 05:25:18.6 RM        0.2  60 84.785 T=5087.12,mag+4.5->inv
87- 40 A 99-04-08 11:41      AB        0.2  12 85.12  T=1021.4


Jason wrote :
> 		Yesterday I observed the near geosynchronous satellite Gorizont
> 14 (#,
> 87-040A) which was flashing brightly at magnitude +5. Flash period was
> 43.85s counted over 30 periods ending at 19:42UT, 20th September 1999.
> Flashes had smooth maxima which lasted approximately 1s. The flash period
> is approximately half the period reported in the PPAS database, which
> indicates either that the period has accelerated or that only alternate
> flashes were visible in previously reported observations of this satellite.
>
> 87- 40 A 98-03-27 12:05      AB                85.0   peak flashes to mag +3
> 87- 40 A 98-03-27 12:05      AB                85.0   peak mag +3
> 87- 40 A 98-03-28 12:00      AB                84.92
> 87- 40 A 98-09-20 05:55      MM             57 87.33  T=4977.8, mag4for80min
> 87- 40 A 98-09-24 05:49:48.8 RM        .15  45 87.320 T=3929.4, mag +5->inv
>
> It would be interesting to identify the cause of the change in flash
> period. I remember trying to observe Gorizont 14 without success sometime
> in the spring of 1998, so it is quite likely that the visibility of flashes
> varies throughout the year & with the observers location (eg. perhaps only
> visible at certain latitudes). Hence, observations from different locations
> would be useful to determine if the flash pattern / visibility varies with
> observers latitude.
>
> Gorizont 14 will be visible over Europe & Africa during the next week &
> will be visible from the eastern United States by the end of the month. It
> takes approximately 37 days for the satellite to make one circuit of the
> earth (as seen from the earths surface, the orbital period is 1474.4
> minutes). Here is a recent orbital element for Gorizont 14:
>
> Gorizont 14
> 1 17969U 87040A   99256.81129258 -.00000126  00000-0  10000-3 0  7305
> 2 17969  10.3120  40.6742 0026990 314.5196  45.3339  0.97657373 24414
>
> Further information on the Gorizont, Ekran & Raduga satellites can be found
> on my web page:
> http://www.geocities.com/CapeCanaveral/Hangar/1668/gorizont.htm
>
> There is also a new page on high altitude satellite orbits (with graphical
> representations of orbits) that some of you may find interesting:
> http://www.geocities.com/CapeCanaveral/Hangar/1668/orbits.htm
>
>
> Best wishes & Clear skies,
>
>
> Jason
>
> Jason P Hatton
> 06200 Nice
> France
>
> 43.692N, 7.246E,30M
> (43d41'29"N,7d14'47"E,30m)
>
> http://www.geocities.com/CapeCanaveral/Hangar/1668/high-alt.htm
>