Statement
about NHK Topics Item released on August 2 (JST)
(in Japanese)
Norio Kaifu
Director General
National Astronomical Observatory of Japan
Hiroyasu Ando
Director of Subaru Telescope
Subaru Telescope, National Astronomical Observatory of Japan
Topics reported by NHK (Nippon Hoso Kyokai;
Japan Broadcasting Corporation) on August 2 (JST) in Japan
contains information that may prove misleading to the public.
Specifically, the report claims that Subaru Telescope has
experienced a new problem. In fact, Subaru Telescope is operating
normally and being used for scientific research as scheduled.
There are no new problems with the telescope. Beginning in
August and running till the middle of October, Subaru Telescope
is scheduled to undergo various maintenance tasks, which are
explained here. We request that Topics agencies refer to this
document if necessary.
On March 19, 2000, a device called a "fixed point"
became detached from the reverse side of Subaru Telescope's
primary mirror (Release
of May 12, 2000). As this is not the surface of the mirror
that's used to gather and focus starlight, there has been
no effect on the performance of the telescope. Repairs were
carried out and the telescope continues to perform well. (Please
see the
first release after the repair work).
Starting on August 8, we will be recoating Subaru's primary
mirror. This is routine work that happens roughly once per
year. During this process, the mirror is removed from telescope
and lifted off the mirror cell. This gives us the opportunity
to do further work on the three fixed points, replacing them
with units of a more serviceable design. The plan to exchange
the fixed points was worked out more than a year ago.
Further regarding the Topics item broadcast
by NHK on August 2nd (and currently available as a RealMedia
clip on their website), please note:
-
- there are 261 acutuators which support
Subaru's primary mirror, not 291, as reported;
- only one of the fixed points detached, not two; and
- the telescope shown in the second half of the Topics
clip is NOT Subaru Telescope ... it's one of the Keck
telescopes.
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