1. Discussion: Summary & Questions

2. Specification of 2m space station UV/Op telescope D : Aperture 2m f / D 12 focal lenth 24m Field view ： 1.5 degree Final image quality 0”.15 (for 1.5 degree field) CCD parameter Pixel size: 9 micron Pixel scale: 0”.075 / pixel 10k x 10k Using 7x7 CCDs to cover 1D x 1D

3. 滚动侧视角为 φ=20.1 度时的可观测天 区，在低银纬存在空隙，此区域为固定的 区域； 而在高银纬以上却能无空隙覆盖，在 (180-i-b- φ)55.3 度以上的区域没有银经度 上的空隙。

4. 给定的低银纬区域

5. Survey Sciences 1.Galactic astronomy Q1. science – driven parameters? metallicity ? kinematic : proper motion ? radial velocity ? others ???? Q2. accuracy for the parameters ? Q3. sky coverage ? galactic center? Disc? Bulge ? Halo ? Specific targets? Q4. survey depth (limiting mag) ? Q5. approach tech: multi-color photometry ? ( λ ? width? number ?) slitless sp ? (prism/grism? Sp resolution ? emission / cont.

6. Survey Sciences 2. Extra-galactic astronomy Q1. science – driven parameters? morphology? photo-z emission lines? others ???? Q2. accuracy for the parameters ? Q3. sky coverage : area? specific targets? Q4. depth: ( limiting mag) ? Q5. approach tech: multi-color ? (central wavelength? band width? Number ?) slitless sp ? (prism/grism? Sp resolution ? emission / cont.

7. Survey Sciences 3. Relation with other survey: competition and collaboration survey: independent ? or + LSST, EUCLID survey ? 4. Compromise between galactic and extra-galactic astronomy: filter, Slitless, sky coverage, depth, time-domain…… 5. Observation strategy color first; sky coverage first compromise ? how ?