Special Call for Proposals to Observe Comet Tempel 1 Deep Impact Event

March 18, 2005

Keck Observatory, Gemini Observatory & Subaru Telescope

This is an open call to the world astronomical communities to observe the Deep Impact event on Comet Tempel 1 in July 2005, using the most powerful telescopes and instruments currently available.

In support of the Deep Impact mission to intercept Comet Tempel 1, windows of Director’s Discretionary time have been reserved on the Keck I & II, the Gemini North & South and the Subaru Telescopes. These windows (corresponding to times before, during and after the impact) are:

For Keck, I & II, the night of July 3rd;
For Subaru, the night of July 3rd;
For Gemini North, the nights of July 2nd, 3rd, and 4th
For Gemini South, the nights of July 3rd, 4th and 5th

[The encounter time is currently scheduled for 06:10 4 July 2005 UT, which is 20:10 July 3rd in Hawaii. These times could move slightly later. This timing means that the comet will have set as seen from Chile, and the impact itself will not be observable there.]

Keck has reserved only the night of impact itself for the high resolution spectrograph, HIRES on Keck I, and the near infra-red spectrograph, NIRSPEC on Keck II. All capabilities currently available on Gemini (except GNIRS and GMOS-South) and Subaru are offered. Selection of the instruments will be based on the proposal’s scientific merit and coordination between the observatories.

The three observatories are inviting joint or individual proposals to all three facilities. Proposers should be aware that the observatory Directors will coordinate the efforts to provide the most complete coverage of the event and to exploit their respective observational strengths. Data from all observatories will be made public immediately after completion of quality assessment.

All proposals can be submitted directly to all (but at least one) of the observatory sites:

For the Keck programs, send your proposal(s) to Randy Campbell at

For the Gemini programs, send your proposal(s) to Phil Puxley at for Gemini South proposals, and to Jean-Rene Roy at for Gemini North proposals.

For Subaru programs, send your proposal(s) to Masa Hayashi at


Deadlines for proposals are April 30th, 2005. The observatory directors will then meet to choose the programs. Selected PIs will then be contacted to prepare the appropriate phase II material.

Observatory, telescope and instrument information can be found at the three observatory web sites:
Keck Observatory is at
Gemini Observatory is at
Subaru Telescope is at



Proposal Submission to Subaru Telescope

Send following information to < > via e-mail with the key word "DEEP IMPACT" in the Subject line. The information should be in either English or Japanese.

  1. Program Title:
  2. Name (Principal Investigator):
  3. Institute:
  4. Phone:
  5. Instrument:
  6. Science Justification: (Please give observing method and technical details in addition to the detailed scientific merit of your program. Also be sure that the comet 9P/Tempel 1 is observable from Mauna Kea between 7 pm to 11:30 pm on July 3.)

Please feel free to ask <> if you have any questions.


March 18, 2005 : Release
April 6, 2005 : Update



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