I was motivated to compile a list of Centaurs and a few other
eccentric-orbit objects I've seen, as of 2002/09/07 (partially
updated 2004/03/21).  Some flash periods are estimated ("~").  
"Asymm" means that secondary flashes were visible but were not 
on the half-period.  I've seen many of these without 
magnification and all in 10x50 binoculars.  USA 136 Rk is 
different -- in a Molniya-type orbit, like 90004 and 90006.  
(But the speculation is that the latter two are payloads.)  I 
may not have all of the re-entries.  "CZ" is for "Chang Zheng" 
("Long March").  Almost all of the dates are simply the most 
recent time I've seen that one -- that I was able to find in 
my recorded data.  The last two, 90004 and 90006, have pseudo-
designations assigned by amateur observers.  To my knowledge, 
they have not been identified with specific launches (yet). 

Design., NORAD, Common Name          Period    Date Obs Note(s)
-------- ------ -----------------    --------- -------- -----------------
71-006B, 04882, Intelsat 4-F2 Rk   =  5.9  sec 20040221
71-116B, 06779, Intelsat 4-F3 Rk   = 18.7  sec 20030813 asymm 10.3 8.4
72-003B, 05816, Intelsat 4-F4 Rk   =  1.57 sec 20030907
73-058B, 06797, Intelsat 4-F7 Rk   =  3.32 sec 20040218
76-042B, 08840, Comstar 1 Rk       ~  4.9  sec 20000110
76-073B, 09329, Comstar 2 Rk       = 21.1  sec 20000124
77-041B, 10025, Intelsat 4A-F4 Rk  =  5.55 sec 20031204 double maxima
78-016C, 12908, FleetSatCom 1 Rk   = 10.7  sec 20031222
78-035B, 10779, Intelsat 4A-F6 Rk  =  4.60 sec 20010930
80-087B, 12069, FleetSatCom 4 Rk   = 13.1  sec 20031003
80-098B, 12445, Intelsat 502 Rk    = 15.9  sec 20021216
81-018B, 12363, Comstar 1D Rk      =  3.0  sec 19990802 (and 200209)
81-050B, 12497, Intelsat 501 Rk    = 14.6  sec 20031124 asymm 8.3 6.3
81-119B, 13007, Intelsat 503 Rk    =  8.49 sec 20031231                     
84-035B, 14900, STTW-T2 CZ-3 Rk    = 26.9  sec 20000529 (CZ) all one-power
85-055B, 15874, Intelsat 5-F11 Rk  ~ 19?   sec 20020817 (or /2)
85-087B, 16102, Intelsat 512 Rk    ~  4.3  sec 20020905
92-013B, 21907, Galaxy 5 Rk        = 37.9  sec 20011223 asymm or /2
92-032B, 21990, Intelsat 101 Rk    =  4.60 sec 20020126 decayed 20020530
93-015B, 22564, UHF F1 Rk          ~ 24?   sec 19990715 decayed 20000106
93-056B, 22788, UHF F/O F2 Rk      ~  7.8  sec 20000604
94-035B, 23133, UHF F/O F3 Rk      ~ 17.9  sec 20000529 decayed 20010405
94-080B, 23416, DFH-3 Rk           ~  4.7  sec 19980810 (CZ)
97-021B, 24799, DFH3-2 Rk (CZ-3A)  ~  6.5  sec 20020901 (CZ)
97-068B, 25035, USA 136 Rk         ~  1    sec 20020818
98-014A, 25240, Intelsat 806 Rk    ~ 10    sec 20010728
98-016B, 25259, UHF F8 Rk          ~  7?   sec 20000524
98-058B, 25502, UHF F9 Rk          ~  8?   sec 20020814
99-023B, 25725, Milstar 3 Rk       ~  1.5  sec 20020602
99-750A, 90004, Unknown               5.0  sec 20020906
00-596A, 90006, Unknown              10.5  sec 20020120
-------- ------ -----------------    --------- -------- -----------------