NOSS 3-8 A&B closing in

From: Leo Barhorst via Seesat-l <>
Date: Mon, 13 Mar 2017 14:39:13 +0100
In the last few days the NOSS 3-8 A&B pair (42058 & 42065) are closing in
on eachother.
On Mar 10 the leading object B was late on predictions and the trailing
object A was early.
Last night 3 passes were imaged. The leader B was on time but a bit off
track in the 3rd pass.
The traling object A was still early wrt newer TLE's and on track.

To get a time difference between the two objects images were measured with
both objects in it.
Sattools puts 250 frames in one inmage at 25 fps; so the track of the
object is over 10 sec.
The length of the track was measured in mm from a zoomed in image and also
the lengt in mm
from the end of the track of 42065 to the end of the track of 42058.

The time difference is then: (length end to end / tracklength) x 10 sec.

This gives the following results:
2017-03-10 02:02:06 UT  25.83 sec
2017-03-12 23:49:14 UT  17.36 sec
2017-03-13 01:38:41 UT  16.55 sec
2017-03-13 03:31:03 UT  16.29 sec

It looks like the closing in rate is slowing down.

Hope the weather will co-operate in yhe next days (or rather nights).

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Received on Mon Mar 13 2017 - 08:40:02 UTC

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