查看“SpecobjID”的源代码

*DR7 
Bits Length  (# of bits) Mask Assignment Description
:0-15  16 0xFFFF000000000000  plate number of spectroscopic plate 
:16-31 16 0x0000FFFF00000000 MJD MJD (date) plate was observed 
:32-41 10 0x00000000FFC00000  fiberID number of spectroscopic fiber on plate (1-640) 
:42-47 6  0x00000000003F0000  type type of targeted object 
:48-63 16 0x000000000000FFFF  line/redshift/index 0 for SpecObj, else number of spectroscopic line (SpecLine) or index (SpecLineIndex) or redshift (ELRedhsift or XCRedshift)


*DR8 and after
:50-63 plate id number (14 bits)
:38-49 fiber id number  (12 bits)
:24-37 MJD (date) plate was observed minus 50000 (14 bits)
:10-23 rerun (14 bits)
:0-9   line/redshift/index: 0 for SpecObj, else number of spectroscopic line (SpecLine) or index (SpecLineIndex) (10 bits)