long triple Iridial glint

Walter Nissen (dk058@cleveland.freenet.edu)
Tue, 21 Jul 1998 19:49:28 -0400 (EDT)

OBS: 
 
Ir 23 mag 1?       glint  19980721  40149.15   unseen before glint 
      mag 1?       glint  19980721  40158.56 
      mag 1?       glint  19980721  40220.65 
      sudden drop to      19980721  40229.71   later mag 5? 
       mag 4 or 5 
 
Flat maxima, PPAS code: M, are quite difficult to judge, but these were 
more difficult than usual.  The drops between the first 3 events were only 
maybe 1/2 magnitude.  The general impression, with my expectation fueled 
by previous experiences of briefer glints, was that it just went on and on 
for a very long time. 
 
Even when objects are quite bright and I am using binoculars, I have 
developed the habit of using averted vision to locate the flat M maxima. 
I place the object on the most sensitive, rod-rich area of my retina just 
above the relatively light-insensitive fovea.  This places the object just 
below the very slightly whitish, central, foveal spot in my field of 
vision.  One reason this is the most sensitive area may be that the eye is 
accustomed to a bright field above (sky) and darker field below (ground). 
I feel this technique gives me a more accurate idea of the time of the 
maximum.  Even using this sensitive technique, I had some difficulty 
discerning the 3 maxima.  Though, I would nevertheless say they were quite 
definite. 
 
Another OBS, for a tumbler: 
84-123 A 98-07-21  3:37: 2.8 WN   27.2  .8   4    6.81 AA', NOAA 9, mag 3 or 4 
 
I think I am using the most recent version of IRIDFLAR available for 
pre-386 hardware 
IRIDFLAR EXE   123571   19971201 1928 
Occasionally, the 3 lines of its output are not in chronological order, as 
seen below.  If I pay little attention to this nit, I see great glints. 
 
Cheers. 
 
Walter Nissen                   dk058@cleveland.freenet.edu 
-81.8637, 41.3735, 256m elevation 
 
--- 
 
"If you want to build a ship, don't drum up people together to collect wood 
and don't assign them tasks and work, but rather teach them to long for the 
endless immensity of the sea."  -- Antoine de Saint Exupery 
 
--- 
 
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 
23 98- 7-21  4:01:59.5 243 21 14h44  -4.9 1688.7 A Lit 336 -24.0 F  2.27  2.6 -6.8  1.2  40.8168  -83.6239 
23 98- 7-21  4:01:57.0 242 21 14h45  -5.4 1697.9 A Lit 336 -24.0 F  2.23  2.6 -6.8  1.1  40.7151  -83.6004 
23 98- 7-21  4:02:06.0 244 22 14h42  -3.6 1664.8 A Lit 336 -24.0 F  2.61  2.9 -6.9  1.5  41.0878  -83.6832 
 
reformatted to conform to my oneline QuickSat output: 
       H  M  S  TIM AL AZI C   U  MAG SHD  RNG  R A   DEC 
       4 01 59   ?  21 243     A  2.6     1688 1444  -4.9  Iridium 23 -24 
24906  4 01 57   ?  21 242     A  2.6     1697 1445  -5.4  Iridium 23 -24  r 
       4 02 06   ?  22 244     A  2.9     1664 1442  -3.6  Iridium 23 -24 
 
For predictions, from OIG: 
IRIDIUM 23 
1 24906U 97043D   98201.18459896 +.00000056 +00000-0 +12883-4 0 02208 
2 24906 086.3974 261.5466 0003051 065.4938 294.6570 14.34217138047844 
 
Later elsets from OIG, some for recent OBS: 
IRIDIUM 75 
1 25346U 98032E   98201.11201406 +.00000284 +00000-0 +54863-4 0 00598 
2 25346 086.5475 229.8882 0003977 062.8529 297.3080 14.59809177009238 
IRIDIUM 71 
1 25320U 98026B   98201.19093201 +.00000748 +00000-0 +26012-3 0 00783 
2 25320 086.3983 261.5144 0001512 029.2263 330.9010 14.34219868011348 
IRIDIUM 66 
1 25289U 98021E   98201.15582136 -.00000070 +00000-0 -32223-4 0 01253 
2 25289 086.3978 229.9632 0009366 078.9165 281.3083 14.34215494015022 
IRIDIUM 65 
1 25288U 98021D   98201.14946007 -.00000142 +00000-0 -57610-4 0 00764 
2 25288 086.4011 229.9790 0002462 044.2118 315.9273 14.34217051015025 
IRIDIUM 45 
1 25104U 97082A   98201.13385387 +.00000000 +00000-0 -68870-5 0 01443 
2 25104 086.4003 261.5548 0002517 011.3901 348.7350 14.34217239030375 
IRIDIUM 24 
1 24905U 97043C   98201.14020146 +.00000053 +00000-0 +11911-4 0 01965 
2 24905 086.3996 261.5393 0002449 056.1774 303.9666 14.34216990047835 
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