Reports from Geisei Observatory <October 20, 2001>

• Observatioin Data: P/2001 T3(NEAT), P/2001 R6(LINEAR-Skiff),
C/2001 Q4(NEAT)

P/2001 T3
2001 U.T            R.A           Decl.     m1
Oct. 18.65104   1 42 01.41   - 8 16 20.3   17.0   372
     18.67188   1 42 00.46   - 8 16 14.5          372

P/2001 R6
Oct. 18.61944   0 59 43.57   -21 57 58.8   17.1   372
     18.63264   0 59 43.05   -21 57 52.7          372

C/2001 Q4
Sept.16.75799   2 40 12.69   -26 58 13.6   18.5   372
     21.73507   2 38 45.68   -27 23 15.8          372
     28.76146   2 36 25.71   -27 57 29.1          372

These are all faint objects. The discovery magnitude of P/2001 T3(NEAT) was 18 but in IAUC7734 issued immediately after its discovery reported it to be magnitude 15. How do you reconcile this discrepancy? My observation at Geisei recorded it as a 17th-magnitude object.
C/2000 WM1(LINEAR) is clearly visible in the 20cm-refractor.