Open Use Observations Policy
Rules to follow at the summit
We ask observers to follow the policy below in order to make
observations safely at the Mauna Kea summit and to improve the
performance of the Subaru telescope.
- The Subaru telescope safety rules require that nobody should
stay at the summit for more than 14 hours. Telescope operators will
start the telescope shut down procedure at 6:30 am accordingly.
Please finish all observations by 7 am and leave the summit
- Telescope operators will decide to change the dome rotation
direction, to close the main shutter, or to evacuate observers from
the summit under strong wind or high humidity weather conditions.
Please follow the operators' decision.
- Focus checks will be carried out with the autoguider probe at the
beginning, middle, and end of observations to confirm the 2ry mirror
control system is working correctly and, more importantly, to acquire
data to improve seeing. It takes about 10 minutes for each focus check.
Policy for making observations not listed in the proposal
The following policy has been enacted for observers who wish to
perform observations not listed in the proposals.
Open use observing time must not be used for observations which
were not specified in the proposals, because the telescope time has
been allocated for the observing plans with specific targets and
observing modes properly evaluated and accepted. There will be cases,
however, when open use visitors cannot perform their proposed
observations because of unexpected operational or weather
requirements. As a result, they may want to use part of their
telescope time for observations not listed in the proposals. The
Director of the Subaru Telescope would like to respond flexibly in
such cases, provided that the modified observations do not conflict
with the clearly prohibited cases stated below. We wish the open use
observations to be as productive as possible and the telescope time
should be used efficiently.
- Case A: More than 1 hour of time is expected
- This case may be expected to arise when a support astronomer closely
works with visiting astronomers in the preparation of observations. If it
occurs, the support astronomer should prompt the visiting astronomers to
submit a plan for the extra observations (title and targets) to Michitoshi
Yoshida (Director) and Tae-Soo Pyo
(Science Operation Division Chief) [yoshida_at_naoj.org,
pyo_at_naoj.org]. The Director will give the final decision.
- Case B: Less than 1 hour of time is expected or is suddenly
available during observations
- If the time is expected in advance, visiting astronomers should follow
Case A. In most cases, however, time will often become available
unexpectedly during, or at the end of, observations. If it occurs, the
support astronomer should check if the extra observations do not
conflict with the clearly prohibited cases and should make the final
decision. The support astronomer should immediately report the case to
the Director (e-mail or verbal).
- Case C: When planned observations cannot be done due to bad
- Visiting astronomers should make observations based upon their
backup proposals. The support astronomer should check that the backup
observations do not conflict with the clearly prohibited cases,
because observing targets are not specified in many of the backup
Clearly Prohibited Cases
- Observing the targets listed in other accepted proposals with similar
- Observing the targets listed in guaranteed time observations (GTO)
with similar observing modes. GTO targets must be listed in the Call for Proposals.
When visiting astronomers make observations not listed in their
proposals, they must describe it in the Open Use Report Form. Subaru
telescope will summarize the use of time under such circumstances and
will report to the Subaru Advisory Commitee.