[X] My Assistant

[pioneer]

I realize the real-time transmission of the probe data is not possible since the high-gain antenna will be pointed toward Titan to receive the data, but couldn't the low-gain antenna on the side of Cassini send a message to Earth indicating whether or not Huygens survived its descent throught Titan's atmosphere?

[djellison]

Seing as you're going to know that 4 hours later by virtue of the HGA downlink - there would be no quantitative benefit - and the only qualitative beneift is to satisfy an impatient mind. It costs you r/f interference that may damage relay ops, and involves using spacecraft systems that dont have to be used. When you're doing everything possible to avoid a safing incident - thats not wise anyway.

Furthermore - it's hoped that a signal ( but no telemetry ) may well be seen from earth, of Huygens - and using multiple antennae a trajectory can be calculated from the doppler shift measured.

In conclusion - the only benefit in LGA ops during relay ops would be to satify understandable impatients. The drawbacks include increased chance of orbtier safing ( very bad), possible R/F interference ( bad ) and it's duplicating what's hoped to be done on earth anyway.


Doug

[pioneer]

Thanks Doug.

it's hoped that a signal ( but no telemetry ) may well be seen from earth, of Huygens - and using multiple antennae a trajectory can be calculated from the doppler shift measured.

Wow I didn't realize that was possible from such a large distance and a weak signal from Huygens.