pro Con_specObjID, specObjID,plate,mjd,fiber
; convert SDSS specObjID to plate,mjd and fiberID (after DR8)

	ul2=ULONG64(2)

;plate	
	Uplate=(ul2)^14-1
	Uplate=ISHFT(Uplate,50)
	Plate=ISHFT(specobjID and Uplate,-50)
	
;mjd
	uMjd=(ul2)^14-1
	umjd=ISHFT(uMjd,24)
	mjd=ISHFT(specobjID and uMjd,-24)+50000

;fiber
	Ufiber=(ul2)^12-1
	Ufiber=ISHFT(Ufiber,38)
	fiber=ISHFT(specObjID and Ufiber,-38)
end