home *** CD-ROM | disk | FTP | other *** search
- Newsgroups: sci.astro
- Path: sparky!uunet!mcsun!news.funet.fi!aton.abo.fi!usenet
- From: MLINDROOS@FINABO.ABO.FI (Marcus Lindroos INF)
- Subject: TAU Probe?(1000 Astronomical Units)
- In-Reply-To: MLINDROOS@FINABO.ABO.FI's message of Sat, 23 Jan 1993 08:26:09 GMT
- Message-ID: <1993Jan25.194852.28948@abo.fi>
- Sender: usenet@abo.fi (Usenet NEWS)
- Organization: Abo Akademi University, Finland
- References: <1993Jan23.082609.4201@abo.fi>
- Date: Mon, 25 Jan 1993 19:48:52 GMT
- X-News-Reader: VMS NEWS 1.24
- Lines: 35
-
-
- I recently saw a couple of pictures of the proposed Thousand Astronomical Units
- probe in a book by Nicholas Booth. The craft itself looks like an enlargened
- Cassini/Mariner mk.II, with a huge antenna dish [diameter of approx. 15
- meters], an optical laser system for communications, an 1.5-meter telescope
- for carrying out measurements of radial velocities for nearby stars(?) and the
- customary particle and fields experiments equipment.
- ---
- The second part, the ion engine, wasn't really dealt with in the text so I'd
- appreaciate it someone could fill in the details. It's basically a long
- cylinder with a small nuclear reactor in the rear end powering the engine. The
- ion drive will accelerate the propellant [metals like Mercury or Cesium?] to
- velocities of up to 70km/s and will fire continuously for ten years. After
- that, the two parts would separate and the engine section would act as a relay
- station between the probe itself and Earth. The spacecraft will reach a
- velocity of 100 km/s and a distance of 1000 AU (0.002 light-years)
- in only fifty years. In addition, a Pluto orbiter could be released as the
- probe leaves the solar system.
- ---
- How would the probe be launched? It appears to be far too big and heavy to fit
- inside a standard rocket booster. Will they use the shuttle for this, and will
- the ion engine be used for accelerating the probe out of Earth orbit as well?
- ---
- Jet Propulsion Laboratory came up with the mission plan. Perhaps Ron Baalke can
- shed some light on this?
-
- MARCU$
-
- --------------------------------------------------------------------------
- > . . . Fififinlandssvensk
- >
- > Marcus Lindroos Internet: mlindroos@abo.fi
- > Computer Science
- > Abo Akademi University
- > Finland
-