RE: Ofeq orbit-raising manoeuvre

From: Ted Molczan via Seesat-l <seesat-l_at_satobs.org>
Date: Sun, 13 Apr 2014 11:35:07 -0400
Phillip Clark wrote:

> As a guide, starting with Ofeq 3, all of these satellites have performed a
> perigee-raising manoeuvre at their first pass through apogee.

It appears that the mission did begin with the usual insertion into an orbit of mean motion ~15.4 rev/d with perigee
~250 km, followed by perigee-raising at first apogee, resulting in mean motion ~15.3 rev/d. By the time Brad Young
observed it, about 2.3 d after launch, it had further raised it perigee, resulting in mean motion ~15.2 rev/d. 

The mean motion has yet to be precisely determined. The value in the elset I posted overnight, 15.22366 rev/d, puts the
second perigee-raising on Apr 10 at either the apogee passage near 13:07 UTC or the next one, near 14:41 UTC. The
estimated point of intersection between the previous and present orbit is very sensitive to mean motion, so the
estimated apogee of the manoeuvre may change considerably if/when we obtain more precise current elements.

Ted Molczan


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Received on Sun Apr 13 2014 - 10:36:05 UTC

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