Ir glints, bright tumblers, Ir 71

Walter Nissen (dk058@cleveland.freenet.edu)
Sat, 25 Jul 1998 18:38:36 -0400 (EDT)

OBS: 
 
Ir 69 mag 0?       glint        19980724  34408.27   unseen w/o glints 
      mag 0?       glint        19980724  34418.65 
      disappeared               19980724  34432.43 
 
Ir 22 mag 2?       glint        19980724  35258.49 
      mag 4? for the largest, later part of the interval between the timings 
      finally dipped to mag 5?  19980724  35340.67 
 
Flat maxima, PPAS code: M, are quite difficult to judge. 
 
 
A couple of interesting tumblers: 
PPAS(beginning): 
98- 43 G 98-07-24  4:01:52.8 WN   43.9  .8   3   14.64 __', Resurs 1-4 r, 
                        25400, initially S near Arcturus, then began to dim 
                        briefly, sub-periods 6.75s + 7.89s = 14.64s 
                        minima measured as much more precise than M maxima 
97- 82 B 98-07-25  2:13: 7.5 WN   73.5  .8  11    6.68 FF', Iridium 24/46 = 
                        25105, most flashes mag 2?, one mag 0?, mostly 
                        mag 5 or 6 when not flashing 
 
(Kurt, I intend to respond to your next "call for OBS" by summarizing the 
OBS I've been reporting in bits and pieces like this to SeeSat-L, 
correcting the G piece designation for 25400, and, unless I hear from you, 
including the proposals I sent you in response to your analyses of 
93- 61 A and 97- 34 C.) 
 
Can anyone confirm the sub-periods for the bright 98- 43 G?  Can anyone 
recall an object presenting a similar appearance?  Steady in the South, 
displays brief dips in the North.  I can't recall such an object.  Here's 
a recent elset: 
Resurs 1-4 r 
1 25400U 98043G   98204.17547267 -.00000045 +00000-0 +00000-0 0 00235 
2 25400 098.7943 274.2078 0009774 318.0590 041.9850 14.24198594001832 
 
 
Clouds played hide-and-seek with me during passes of Ir 71 both last night 
and the night before, allowing me at most a momentary glimpse just prior 
to a predicted glint.  Here is a recent elset: 
IRIDIUM 71 
1 25320U 98026B   98205.30726926  .00000126  00000-0  37845-4 0   661 
2 25320  86.3983 259.7943 0001160  33.5561 326.5706 14.34219623 11939 
 
 
Cheers. 
 
Walter Nissen                   dk058@cleveland.freenet.edu 
-81.8637, 41.3735, 256m elevation 
 
--- 
 
Whoever will understand America will first understand baseball. 
 
--- 
 
Details: 
Latitude:  41.37350  Longitude:  -81.86370  Altitude:  256.0 m 
Time Zone: UTC  +0.0 h 
                      Iridium Coordinates  Range   Sat   Solar                Peak  Std    Maximum Flare 
Ir   Date      Time    Azm El   RA   Decl  (km)  N Ill Azm  Elev M FlrAng Mag  Mag  Mag Latitude Longitude 
69 98- 7-24  3:43:53.0 243 22 14h40  -4.0 1646.2 A Lit 332 -23.0 F  2.64  2.9 -6.9  1.5  40.8495  -81.2143 
69 98- 7-24  3:44:08.9 247 23 14h33  -0.6 1590.9 A Lit 332 -23.1 F  0.57 -1.4 -6.9 -2.7  41.5057  -81.3981 
69 98- 7-24  3:44:24.0 251 25 14h27   2.7 1543.8 A Lit 332 -23.1 F  2.69  2.9 -6.9  1.6  42.1427  -81.5439 
 
22 98- 7-24  3:52:48.0 245 18 14h30  -5.8 1855.3 A Lit 334 -23.8 F  2.37  2.9 -6.6  1.3  40.3544  -83.3602 
22 98- 7-24  3:53:00.0 248 18 14h26  -3.6 1812.6 A Lit 334 -23.8 F  1.70  2.1 -6.6  0.4  40.8384  -83.5222 
22 98- 7-24  3:53:12.0 250 19 14h22  -1.4 1772.7 A Lit 334 -23.8 F  2.40  2.9 -6.6  1.3  41.3321  -83.6645 
 
reformatted to conform to my oneline QuickSat output: 
       H  M  S  TIM AL AZI C   U  MAG SHD  RNG  R A   DEC 
       3 43 53   ?  22 243     A  2.9     1646 1440  -4.0  Iridium 69 -23 
25319  3 44 08   ?  23 247     A -1.4     1590 1433  -0.6  Iridium 69 -23 !! 
       3 44 24   ?  25 251     A  2.9     1543 1427   2.7  Iridium 69 -23 
       3 52 48   ?  18 245     A  2.9     1855 1430  -5.8  Iridium 22 -23 
24907  3 53 00   ?  18 248     A  2.1     1812 1426  -3.6  Iridium 22 -23  r 
       3 53 12   ?  19 250     A  2.9     1772 1422  -1.4  Iridium 22 -23 
 
For reconstructed predictions, from OIG: 
IRIDIUM 22 
1 24907U 97043E   98205.15505859 +.00000077 +00000-0 +20353-4 0 01923 
2 24907 086.3978 259.8522 0002315 056.4159 303.7242 14.34217916048415 
IRIDIUM 69 
1 25319U 98026A   98205.14872754 -.00000217 +00000-0 -84468-4 0 00826 
2 25319 086.3976 259.8926 0002397 022.8142 337.3155 14.34212288011882 
 
Later elset for recent OBS, from OIG: 
IRIDIUM 23 
1 24906U 97043D   98202.16135868 +.00000043 +00000-0 +81510-5 0 02285
2 24906 086.3974 261.1387 0003069 062.9422 297.2079 14.34217059047981