# Re:acceleration of 91-19 B = 21153 and 93- 36 B = 22676 ?

Kurt Jonckheere (kjonckheere@unicall.be)
Thu, 30 Oct 1997 21:54:10 GMT

```hello,

91- 19 B = 21153 = SL-8/C1 rocket
This evening I had a nice pass of 91- 19 B.  The measured period
was about 18 seconds again (with some inaccuracies because of
synodic effect).  So we defenitely need more observations to see
if the acceleration has halted or not.
>ALL OBSERVATIONS OF THIS OBJECT ARE VERY MUCH APPRECIATED !!

yesterday I wrote :

>93- 36 B = 22676 = SL-8/C1 rocket
>Maybe the period is about 18 seconds ?  (3 x 18 = 54 sec), which
>would also mean an acceleration.
This evening I had a high pass and could determine a period of 36s with
some secundary maxima (sm), so yesterday I probably so such a secundary
maxima between the clouds.  It is also not clear if this one is
still accelerating or not.  TO BE OBSERVED !
Jan Vansteelandt observed it at about 37 seconds this evening.
period
91- 19 B 97-10-18 19:08:35   LB   72.3 0.5   1 72.3   AA, mag 3->inv
91- 19 B 97-10-20 18:20:22   LB   62.9 0.5   1 62.9   AA, mag 4->inv
91- 19 B 97-10-27 17:57:12   LB   89.9 0.5   4 22.5   AA, mag 4->inv
91- 19 B 97-10-27 17:58      KJ  319.1 0.5  14 22.8   mag 4.5->inv
91- 19 B 97-10-28 18:25:24   LB  113.9 0.5   6 19.0   AA, mag 3->inv
91- 19 B 97-10-29 18:53      KJ  142.4 0.8   8 17.8   mag +4.5->inv
91- 19 B 97-10-29 18:55      KJ  148.6 0.8   8 18.6   synodic effect
91- 19 B 97-10-30 17:36:00.4 KJ  179.8 0.5  10 18.0   FF, syn eff
91- 19 B 97-10-30 17:38:50.9 KJ  182.2 1.0  10 18.2   AA, syn eff.

93- 36 B 97-10-30 18:35      KJ  217.5 1.5   6 36.3   sm, first FF, later MM
93- 36 B 97-10-30 18:35      JVS 111.3 1.5   3 37.1

happy observing,

Kurt Jonckheere
```