[amsat-bb] Re: A reminder - Say "Hi" to Juno
Edward R Cole
kl7uw at acsalaska.net
Tue Oct 8 18:44:16 PDT 2013
It is my understanding the first use of gravitational assist going
from one planet onto another was on the MVM-73 (MA-10) Mission to
Venus and Mercury.
I was involved in part of the MA-10 mission during Venus encounter
when atmospheric density was measured by transmitting two different
signals, one on 2-GHz and the other on 8-GHz. Comparison of
difference in LOS times as the spacecraft passed behind Venus as
viewed from earth measured the differential in bending of the signal
thru the atmosphere. It was again measured by AOS times when the
spacecraft re-emerged minutes later. Tracking stations in Australia
As one of the two Rx operators at DSS-14 at Goldstone during Venus
encounter, it was quite an experience to be directly involved in the
experiment. That was spring of 1974 (which is 39-years ago). MA-10
went on to Mercury to obtain the first close observation of that (up
to that time mysterious) planet.
I do not argue who was the discoverer of the effect.
72, Ed - KL7UW
At 05:00 PM 10/8/2013, i8cvs wrote:
>Hi Glenn, AA5PK and All on the List
>Just to remind that the effect flyby was discovered more than
>20 year ago by Prof. Giuseppe Colombo (SK) astrophisic at
>the University of Padova in Italy and NASA consulting scientist.
>Look please for him on Google
>----- Original Message -----
>From: "Glenn AA5PK" <aa5pk at suddenlink.net>
>To: "SAARC List" <W5QX-Talk at lists.rimbachvets.org>; "Star-Com BB"
><starcom-BB at star-com.net>; "AMSAT BB" <amsat-bb at amsat.org>
>Sent: Tuesday, October 08, 2013 8:12 PM
>Subject: [amsat-bb] A reminder - Say "Hi" to Juno
> > Say "Hi" to Juno
> > NASA's Juno spacecraft will fly past Earth on October 9, 2013 to receive a
>gravity assist from our planet, putting it on
> > course for Jupiter. To celebrate this event, the Juno mission is inviting
>amateur radio operators around the world to say
> > "HI" to Juno in a coordinated Morse Code message. Juno's radio & plasma
>wave experiment, called Waves, should be able to
> > detect the message if enough people participate. So please join in, and
>help spread the word to fellow amateur radio
> > enthusiasts!
> > <http://www.jpl.nasa.gov/hijuno/>
> > _______________________________________________
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73, Ed - KL7UW
dubususa at gmail.com
"Kits made by KL7UW"
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