Re: New (Old?) Flasher?

Tristan Cools (tcools@nic.INbe.net)
Thu, 4 Sep 1997 21:17:04 +0200 (MET DST)

>
>I must report that I had the wrong time by 2 minutes, and that using=20
>the correct time, the UNID flasher was identified; it was DMSP 5DS-14=20
>(24753/97-12A).
>
>Lesson:  Before spending hours identifying an UNID, be certain that
>the data are correct!
>
>Ed Cannon
>Austin, Texas, USA
>30.3086N, 97.7279W, 165m
>


Any idea were those flashes are comming from ? =20

I have checked the PPAS database and found two other DMSP Block 5D--2
satellites with the same flash period of 1.9s:

87-53A/18123
------------

87- 53 A 90-11-30 01:44      MM   13.4 0.2   7  1.9
87- 53 A 91-01-20 01:56      MM   38.2 0.1  20  1.91  rotation, not tumble
87- 53 A 91-08-29 19:53:42   PW   95.6 0.2  50  1.91  ssm, rather sharp=
 flashes
87- 53 A 91-12-14 04:18:25   LB   38.1 0.2  20  1.90  FF, mag +4 -> 6
87- 53 A 91-12-14 04:18:37   LB   37.6 0.2  20  1.880 FF, mag +4 -> 6
87- 53 A 91-12-14 05:58      BD                       S, mag +7.0
87- 53 A 91-12-14 06:00      LB                       S, mag +5
87- 53 A 91-12-14 18:13      BD                       S, mag +7.3
87- 53 A 91-12-14 18:15      TC                       S, mag +6.5
87- 53 A 91-12-15 04:03:23   BD   38.0 0.3  10  3.80  F, mag +5.0->inv,=
 first S.
87- 53 A 91-12-26 18:46      TC                       S or I, mag +6
87- 53 A 92-01-10 04:38:00.8 PEW  95.2 0.3  50  1.9

90-105A/20978
-------------

90-105 A 95-04-02 21:50      TC  114.0 0.1  60  1.900 FF; very nice flashes=
 !
90-105 A 95-04-20 20:37:17.4 RE                 5
90-105 A 95-04-22 21:14      TC   57.0 0.2  30  1.90  only FF 35=F8in NW and=
 lower
90-105 A 95-05-04 21:33:12   PW                       steady
90-105 A 95-05-04 21:34      WV   56.6 0.3  30  1.89  NE
90-105 A 95-05-04 21:34:44   LB   38.0 0.1  20  1.90  FF, mag 5->inv


Looking at a picture of a 5D2 satellite I cannot see any rotating or other
device which is causing those flashes.  There is a chance that other DMSP
5D2 satellites are showing similar flashes.  Maybe we should check 81-82A,
94-57A and 95-15A as well.  I think you have a chance of seeing those
flashes at low elevations but not near culmination.

Greetings,
Tristan Cools
tcools@nic.INbe.net
BWGS member(Belgian Working Group Satellites)

Damse Vaart:    3.2478E/51.2277N 3.75m
Rijckevelde:    3.2856E/51.2045N 6.25m
Brugge     :    3.2166E/51.2104N 5m