Re: Space junk passes within 1 1/2 miles of CRISTA-SPAS

Tristan Cools (tcools@nic.INbe.net)
Thu, 14 Aug 1997 22:04:11 +0200 (MET DST)

>Using the elsets in Jeff Hunt's reply, the minimum separation is
>3.1 km on 8/12/1997  0:40:30.3 UTC with #14694
>
>If that is the time, both elsets are too recent.
>When CRISTA-SSPAS' is replaced with 
>CRISTA-SPAS
>1 24890U 97039B   97224.12583218  .00032248  43500-8  87154-4 0   130
>2 24890  56.9920  55.6842 0007772 290.4567  58.6074 15.93614600   726
>separation becomes 2.5 km, and with #14694 also replaced:
>PAM-D r/b    958 x 294 km Element set number = 3
>1 14694U 84011F   97224.00852238 +.00011498 -57815-5 +14500-3 0 07008
>2 14694 027.6647 106.8767 0474745 119.5451 245.3299 14.80972928722533
>Rob Matson's COLA gives:
>
>   Date    UTC Time  Norad        Name          Range(km) NdAng EphAge
> 8/12/1997 0:40:30.3 14694 PAM-D r/b  958 x 294 km  1.5    96.3  +0.02
>
>
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This is a part of the Crista Spas status report number 5:

Yesterday, there was some concern over space debris passing to close too
the CRISTA-SPAS.  The debris was the PAM-D solid motor upper stage used
to launch a Westar communications satellite from the Space Shuttle
Challenger on STS-11 in 1984.  At one point, the spent stage was
projected to pass 855 meters  from the CRISTA-SPAS.  However, it
actually passed about 2.5 kilometers from the spacecraft, and no action
on the part of SPAS controllers was necessary.    

Tristan Cools
tcools@nic.INbe.net
BWGS member(Belgian Working Group Satellites)

Damse Vaart:    3.2478E/51.2277N 3.75m
Rijckevelde:    3.2856E/51.2045N 6.25m
Brugge     :    3.2166E/51.2104N 5m