Opportunity for Classical Observing at Gemini in 2009A

Verne V. Smith, Todd Boroson, David Silva

The two Gemini telescopes provide several unique and powerful capabilities to US observers, such as full-sky coverage, excellent IR sensitivity, and the ability to support large numbers of queue-scheduled programs (including targets of opportunity or synoptic observations). Gemini can also be used in classical observing mode. Although Gemini is now capable of supporting 100% queue observing, early operations models for Gemini envisioned a smaller fraction of time (closer to 50%) devoted to queue observing. Historically, about 10-20% of the US time on Gemini has been classically scheduled.

While the heavy emphasis on queue-scheduled observing at Gemini offers convenience and scientific advantages, it also has some drawbacks. It has led to only a small number of observers who have actually traveled to the telescopes and observed with them directly. Similarly, few observers have interacted with Gemini staff astronomers. Direct usage of the telescopes and instruments, as well as close interactions between the users and the Gemini staff, is of mutual benefit to both the observing community and the Gemini staff.

In comparison, classical observing offers scientific advantages for certain programs. Classical observers can modify their programs in real time and specify the sequence of the observations. This additional flexibility may result in increased efficiency and scientific productivity. With classical observing the observer can confirm and refine the accuracy of telescope pointing, and otherwise be completely certain as to how the observations were carried out.

For the above reasons, we encourage US observers to consider applying for classical observing with Gemini, if it is appropriate for their proposed programs. We note that the only restriction on requesting classical observing is that the program request an integer number of nights with a minimum of one night. As an incentive, NOAO will cover the travel expenses for up to 2 observers of all classically scheduled programs in the 2009A semester.

Visits by classical observers to the Gemini telescopes and offices would be of benefit to both US observers and the Gemini staff, and will help all of us in planning for the long-range scientific and operational goals for Gemini.

Comments or questions about this opportunity can be addressed to us via e-mail vsmith@noao.edu or telephone (520-318-8453).