Change page style: 

Partner Shares

Current Partner Time Allocation

The expected time allocation to each partner for the current and next semesters is listed in the relevant Call for Proposals.

2013 Partner Time Distribution

A certain percentage of the semester is used for Observatory engineering (maintenance, instrument commissioning, etc.), and this time is taken off the top of the time available. This percentage is approved by the Gemini Board ahead of each Call for Proposals. Also taken off the top is any time required for instrument Guaranteed Time (GT), campaigns and Science Verification (SV); campaigns may only be charged to a subset of the partners. Of the remainder, 10% is allocated to the Observatory host (University of Hawaii or Chile). After the deduction of host time, the remaining time is distributed amongst the partner countries according to the partner shares set by the Gemini Board. This partner time is reduced by a 7% allocation of Director's Discretionary Time, in agreement with Gemini Board resolution 2011.A.9. Currently the Director makes 5% available for staff use via the Call for Proposals, while 2% will be available to all astronomers through the Director's Discretionary Time proposal process throughout the semester. The staff time, host time and partner time are all open for joint proposals. Partners may also purchase time from each other, or trade time between Gemini North and South. To maintain overall balance amongst the partnership, the allocations to each partner each semester are adjusted from the nominal partner shares as a result of actual time charged up to the preceding semester.

Effective January 2013, the UK is no longer a Gemini partner. The diagram and Table below illustrates the partner shares as of 2013. The nominal partner fraction is set by the partnership each year. The time distribution for 2012, prior to the UK pullout, is also available.

A schematic of the 2013 time distribution is given below, right.

The Table below illustrates two example cases of semester time allocation. In Example 1, 10% of the total available time goes to engineering, and 55 hours goes to GT, campaign and SV time. In Example 2, 14% of the total available time goes to engineering, and 180 hours goes to GT, campaign and SV time. For computational convenience it is assumed that there are 10 hours available per night on average.

Partner Shares Schematic
Partner Nominal Fraction Example 1 Allocation (hours) Example 2 Allocation (hours) Effective Fraction
US 56.79% 831 727 52.81%
CA 17.55% 257 225 16.32%
AU 6.66% 97 85 6.19%
BR 5.67% 83 73 5.27%
AR 3.33% 49 43 3.10%
Host (Hawaii/Chile) 10.00% 157 138 10.0%
DDT 7% 99 87 6.3%
GT, campaigns, SV 55 180
Engineering 181 253
Total 1810 1810