Re: HST close approaches

Eberst (eberst@cableinet.co.uk)
Sun, 23 Mar 1997 10:04:28 GMT

At 18:27 97/03/21 -0800, you wrote:
>I used the latest element set for HST to see if it has any close approaches to
>other satellites over the next few days:
>
>HST
>1 20580U 90037B   97080.05727574 +.00000377 +00000-0 +25237-4 0 09658
>2 20580 028.4675 240.1986 0014574 358.9811 001.0726 14.86427821179933
>
>I came up with some interesting "near-hits".  Times and dates are
>Pacific Standard Time (UT - 8 hrs):

> 3/24/1997  4:41:59.2 15889 Cosmos 1666          2.9    +10.41

  --Rob

With the revs/day for Cosmos1666 being very similar to the figure for HST,
this indicates that if there is one close approach between the two objects
as calculated for 3/24/97 at 04:42, then there must be other close approaches
every half-orbit (that's about every 48 minutes). It would be interesting to 
see calculation of the 2 series of close approaches which occur at the two
orbinodes. (I just invented that word, for the point where two orbits cross)
 
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best wishes    Russell  Eberst        North:  55 degrees, 56 minutes, 55 seconds
              West:    3 degrees,  8 minutes, 18 seconds     43metres (150 feet)
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