ISEE-3 Engines Successfully Fired For Spin-Up .

By Steven Keeler | Jul 04, 2014
Further confirmation of the ISEE-3 spin-up burn yesterday. Before the burn ( actually 11 pulses on the spacecraft's hydrazine thrusters ) the spin rate of ISEE-3 was 19.16 rpm. After spin-up burn it was 19.76 rpm. The original mission specifications for ISEE-3 called for a spin rate of 19.75 +/- 0.2 rpm. Bullseye.


By Keith Cowing on July 2, 2014 3:32 PM

Today we fired the A and B thrusters on ISEE-3 to perform a spin-up burn. Preliminary results confirm the burn and a change in rotation. Spin rate was originally 19.16 rpm. It is now at 19.76 rpm. The original mission specifications call for 19.75 +/- 0.2 rpm- so we are exactly where we wanted to be.

We are now collecting telemetry in advance of our next DSN pass and our ATP-3 review with NASA. The earliest we expect to make our Trajectory Correction Maneuver is next week.

All in all, a very good day.


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