SpecobjID

来自Shiyin's note
Shen讨论 | 贡献2015年6月25日 (四) 04:23的版本
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  • DR7 and before
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)

SpecobjID和plate,mjd,fiberID的互转参考[sdssidl]中的程序[1]