[meteorite-list] Hayabusa 2 Approved By Japanese Panel

From: Ron Baalke <baalke_at_meteoritecentral.com>
Date: Thu, 12 Aug 2010 12:04:28 -0700 (PDT)
Message-ID: <201008121904.o7CJ4SQl016779_at_zagami.jpl.nasa.gov>

http://www.spaceflightnow.com/news/n1008/11japan/

Asteroid probe, rocket get nod from Japanese panel
BY STEPHEN CLARK
SPACEFLIGHT NOW
August 11, 2010

The board governing Japan's space program last week formally approved a
successor to the Hayabusa asteroid explorer and the Epsilon small
satellite launch vehicle to continue development.

The Space Activities Commission decision gives the Japanese government
authority to request funding for the programs in its budget for the next
fiscal year, which begins in April.

The government space panel, which has oversight of the Japan Aerospace
Exploration Agency, only gave the go-ahead for preliminary design work
on Hayabusa 2, a mission projected to cost nearly $200 million.

The commission recommended proceeding with full development of the
Epsilon rocket, a new Japanese launcher to send small satellites into
orbit beginning in 2013.

The Hayabusa 2 mission would blast off as soon as 2014 and reach a
carbon-rich asteroid in 2018 for a touch-and-go approach to collect
samples. After spending a few months in the vicinity of the asteroid,
the probe would return to Earth in 2020.

The spacecraft's mission would replicate the feat accomplished by
Hayabusa, the mission that completed the first round-trip journey to an
asteroid in June. During its seven-year journey to and from asteroid
Itokawa, Hayabusa suffered major glitches in its sample collection
device, propulsion system and reaction wheels.

But the probe released an entry capsule that landed in Australia,
possibly with the first microscopic dust grains from the surface of an
asteroid.

Hayabusa 2 would incorporate improvements to the faulty systems that
plagued its predecessor, but the craft would rely on the same
fundamental design to slash costs.

Junichiro Kawaguchi, Hayabusa's project manager, said a "good indication
was shown by the government" in negotiations and hearings over the past
few weeks.

"Precisely speaking, still we need some more time to make it actually
appropriated. But most opinions say the mission shall be performed,"
Kawaguchi wrote in an e-mail to Spaceflight Now.

Kawaguchi is managing the Hayabusa 2 proposal team, but he will
relinquish leadership once the mission enters full development.

Hayabusa 2 would target an asteroid named 1999 JU3, a C-type body with a
diameter of about 1 kilometer, or 0.6 miles. Scientists say C-type
asteroids are the unspoiled relics of the early solar system, which was
dominated by small bodies as the planets coalesced.

Itokawa, the destination for Hayabusa, is a stony rubble pile asteroid
that formed from separate objects fusing together over time.

Japan is moving forward with Hayabusa 2 after the Marco Polo mission, a
joint asteroid probe with Europe, was not selected by an international
panel of scientific advisors earlier this year.

The budget decisions for JAXA are being considered as an economic
stimulus, according to Kawaguchi.

Yasuhiro Morita, the Epsilon rocket's project manager, said the new
launch vehicle will be ready for service beginning in 2013. It will
replace the M-5 rocket, a similar vehicle that flew seven times between
1997 and 2006.

"We've already spent three years on the preliminary design," Morita
said. "This is the actual start of the development. This is a good time
for us."

Now finished with preliminary development, engineers are focusing on a
critical design review planned about 18 months from now.

The Epsilon rocket will launch about once per year with small technology
demonstration and scientific missions, starting with a craft named
Sprint-A that will place a telescope into a 300-mile-high Earth orbit to
observe Venus, Mars and Jupiter.

The three-stage launcher is designed to lift more than 2,600 pounds to
low Earth orbit. The M-5 rocket could haul about 4,000 pounds to a
similar trajectory.

Morita, who is also the former manager of the M-5 rocket program, said
it will cost approximately $200 million to finish developing the Epsilon
rocket, but it's much less expensive than the M-5, which carried a $70
million price for each launch. He would not discuss the Epsilon's cost
per flight.

"For example, the M-5 first stage rocket motor was very expensive
because it uses a big chamber and is in two segments. We had to assemble
the two segments at the launch site," Morita said.

Engineers will also design the Epsilon with more autonomy, making the
rocket less labor-intensive and reducing the workforce required for
launches.

"The launching performance of the M-5 was the best in the world for a
solid rocket at the time, but operations took a lot of time and labor,"
Morita said in an interview with Spaceflight Now. "As far as the Epsilon
rocket, the sales point is its responsiveness. This is far beyond the
M-5's capacity, so we can extend the solid rocket technology in Japan,
not only in the launching capacity but also in operations."

JAXA's goal is to have an inexpensive rocket ready to answer the needs
of scientists and engineers building low-cost satellites.

Epsilon designers are reusing technology from the M-5 and H-2A rockets
to cut costs. The Epsilon's first stage is based on the H-2A's solid
rocket booster, while the second and third stages will use heritage
solid-fueled motors from the M-5's upper stages.

According to Morita, JAXA has still not decided where to launch the new
rocket.

It could be operated from the Uchinoura Space Center on the south shore
of Kyushu, the southernmost of Japan's main islands. The M-5 rocket's
launch pad at Uchinoura could be modified to support Epsilon launches,
Morita said.

Another option is Japan's main launching base at the Tanegashima Space
Center, the home of the much larger H-2A and H-2B rockets. One of two
active launch pads there could be outfitted for the Epsilon rocket, or a
vacant Tanegashima launch pad used by the N-1 and N-2 rockets more than
20 years ago could also host Epsilon missions, according to Morita.

"One of the most remarkable features of the Epsilon rocket is its
mobility, so the vehicle can be launched by Uchinoura as well as by
Tanegashima, and the government has not yet decided its launch site,"
Morita said.

Morita said high construction costs might limit the Epsilon to just one
launch site.

IHI Aerospace Co. is the Epsilon rocket's prime contractor. The company
builds the H-2A solid rocket boosters and previously held the lead
contract for the M-5 rocket.

"The small rocket will be required for small satellite missions," Morita
said. "The H-2A is too big to support small satellites. We need a small
launcher with the responsiveness to support small satellites."
Received on Thu 12 Aug 2010 03:04:28 PM PDT