Re: Irid 14A cover location

=?ISO8859-1?Q?Bj=F6rn_Gimle?= (b_gimle@algonet.se)
Mon, 14 Jun 1999 09:05:47 +0200 (CEST)

Den 14 Jun 1999 skrev finn@main.jetnet.ab.ca:

> Doing up the pass predictions for this evening, i'm getting conflicting info
> about Irid 14A S/D deb (cover) #25783. I get a pass at 07:15 14 Jun UTC at
> Az 80 deg El 18 deg which puts it 32 minutes ahead of the rest of the covers
> which will be passing at Az 270 deg. However cross checking i find that Irid
> 14A deb (cover) will be passing at 08:10 14 Jun UTC at Az 273 deg El 26
> which puts it 20 minutes behind the rest. Last night (13 Jun) all 4 were
> within 4 minutes and a degree or two of each other. ...

This elset has an extreme drag, causing >30 min early arrival after 24h,
growing quadratically. Earlier elsets showed lower values
(they usually do), but just looking at the MM changes below,
I believe .17000000 is a better ndot2 value, and 15000-1 for Bstar.
Depending on if your prediction program uses SGP or SGP4 you may
get different predictions.

CSLO2 DEB1 25783U 99032G   99164.01194808  .36830715 -59717-5  32221-1 0    44
2 25783  86.6889  93.3593 0440481 166.6584 195.0126 15.30210838   185CSLO2 DEB
1 25783U 99032G   99163.35662321  .07486283 -18714-5  74204-2 0    34
2 25783  86.7037  93.6301 0477347 168.8102 196.1569 15.20570180    93CSLO2 DEB
1 25783U 99032G   99162.96029079  .07109604 -18202-5  75812-2 0    23
2 25783  86.7042  93.8120 0500249 170.2757 190.8631 15.14615662    34CSLO2 DEB
1 25783U 99032G   99162.76103768  .00000375 -11773-5  00000+0 0    16
2 25783  86.7223  93.9334 0506459 170.9796 185.4287 15.11638831    06

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