Yes Björn, you are right, we have seen a flash period acceleration for this Zenit rocket, matching clearly with the sudden jump in Mean Motion you show on your graph. See the PPAS extract below, it was steady during 1995 and discovered flashing again by Wim Holwerda in March 1996. But this was anyhow a "special" Zenit, as it was NOT flashing after launch, and seems only to have started flashing after 9 years. 87- 27 B 95-03-22 19:11 WV S, mag +2 87- 27 B 95-05-24 21:11 RO mag 3, S 87- 27 B 96-03-10 19:05:43.5 WH 61.5 1.2 5 12.3 mag +2.5 ->inv 87- 27 B 96-03-10 19:07 WH almost S, mag +2.5 87- 27 B 96-03-10 19:10:48.8 WH 163.2 1.8 13 12.6 87- 27 B 96-04-11 8:37 MPM 10 mag 0 to 2 87- 27 B 96-04-14 02:52:40 LB 88.4 0.2 6 14.73 AA, mag 5->inv 87- 27 B 96-04-20 01:16 LB almost S, mag 4 87- 27 B 96-04-27 01:10:57 LB 124.7 0.5 8 15.6 AA, mag 4->inv 87- 27 B 96-04-28 00:54 KJ 63.1 0.8 4 15.8 mag +2.5->inv 87- 27 B 96-05-04 23:03:18.5 BD 132.0 0.3 8 16.50 2.3->inv 87- 27 B 96-05-05 22:47:15.2 RE 15 87- 27 B 96-05-08 22:02:12 LB 170.7 0.5 10 17.1 AA, mag 3->inv regards, Kurt Jonckheere -----Oorspronkelijk bericht----- Van: Björn Gimle [mailto:bg_26934@glocalnet.net] Verzonden: 29 January 2006 20:19 Aan: Mike McCants; SeeSat-L@satobs.org Onderwerp: Re: Rockets with changing mean motion #17590 is one of the rockets in high circular orbits near 14th resonance with the Earth's rotation. This causes the period to oscillate, and frequently pass into the negative "drag" region. But fuel leaks have also occurred, see http://www.algonet.se/~b_gimle/gif/17590.gif for 199503-199609, and http://www.algonet.se/~b_gimle/gif/17590z.gif for 1996 March-June http://www.algonet.se/~b_gimle/gif/22285.gif is another one, closer to resonance. /Björn ----- Original Message ----- From: "Mike McCants" <mmccants@io.com> To: <SeeSat-L@satobs.org> Sent: Sunday, January 29, 2006 6:41 PM Subject: Rockets with changing mean motion > Object 17590 (87-27B, Cosmos 1833 rocket) has a changing > mean motion with a small negative "drag" term over the > last week. The drag term for day 28 is -.000009. This > is an SL-16 (Zenit) rocket. > > Object 23412 (94-78B, GEO IK Rk) had a changed mean motion between > Jan. 10 and Jan. 18. The SSR says this is an SL-14 rocket. > > There is a chance that these objects are now tumbling. > > Mike McCants > > ---------------------------------------------------------------------- > --- > Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L > archive: > http://www.satobs.org/seesat/seesatindex.html > ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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