ObjID
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DR7之前和DR8之后的定义方式似乎不太一样
- DR8
The bits are assigned in objid as follows:
- 63: 0, unassigned
- 59-62: skyVersion resolved sky version (for DR8 onlyuse 2; 0-15 available)
- 48-58: rerun, number of pipeline rerun
- 32-47: run, run number
- 29-31: camcol, camera column (1-6)
- 28: 0, unassigned
- 16-27: field, field number within run
- 0-15: id, object number within field