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| Huygens 4th Probe Checkout |
| The fourth check-out of ESA's Huygens Probe began on 14 September 1999 at 23:02 UTC and was completed on 15 September at 02:49 UTC. Everything went according to plan - both the Probe subsystems and the six payload instruments performed very well. |
| Date: 15 Sep 1999 |
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| Huygens 3rd Probe Checkout |
| The third inflight checkout of the Huygens Probe was successfully completed over the Christmas period. All systems and experiments performed as expected. Huygens can now sleep on for the next 8.5 months, until its next wake up call in mid-September 1999. Checking of the Cassini's spacecraft continues throughout the month of January. |
| Date: 12 Jan 1999 |
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| Huygens AGC test extended report |
| The Huygens Probe's Automatic Gain Control (AGC) signal level measured during the two in-orbit checkouts (F1 and F2) was observed to be depressed compared to the pre-flight values and also to be strongly modulated with the variation of the HGA pointing at the Sun. It was suspected that the AGC drop was caused by solar radio noise. |
| Date: 16 Jul 1998 |
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