SkyServer: GLossary
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tileA 1.49 deg radius circle on the sky determined by tiling and which contains the locations of up to 592 tilable targets and other science targets. This circle will become the plates into which fibers are plugged to observe spectra. For each tile one or more plates will be created. Only the part of the Tile that is within the union of the TilingBoundaries for the TileRun and outside the union of the TilingMasks for the TileRun and the global TilingMasks may actually have targets. If less than the maximum of 592 tilable targets can be assigned to that tile, the spare fibers are assigned to other spectroscopic targets. The 48 remaining fibers will be assigned to calibration targets.