TYC 0021-00180-1(mag 12.0) by (107)Camilla on 2011 Oct. 23

**** Successful observations:
Observer:    Taksun Poon, Kenneith Hui   (JOIN:13084)
Place:       Hokoon Science Centre, Kowloon, Hong Kong, China
Long.: 114o 06' 28.4" E, 22o 23' 01.7" N, Height: 160m (WGS84, MSL)
Method:      Video with frame analysis; RC-type reflector 50.0cm F8.0
Time signal: GPS-time inserted
Result:      D 17h 40m 56.183s +/-0.25s
             R 17h 41m 12.733s +/-0.25s
Note: Observation was made from 16h 30m to 17h 49m.
 Star and asteroid merged at 17h 36m 30s, separated at 17h 44m 50s.
 Conditions: clear, lights; stability: slight flickering.
 As asteroid & star are of similar brightness, they never disappered.
 They just became distinctly dimmed and then brightened.
 As the brightness of the star and asteroid differs only by about 0.9 mag,
 I was not able to dimm them enough for a null occultation.  Instead,
 it was the sudden dimming of the combination that was used to determine
 the occultation.

** Negative observations
Observer:    Hayato Watanabe  (JOIN:13081)
Place:       Inabe, Mie, Japan
Long.: 136o 33' 33.9" E, Lat.: 35o 07' 10.2" N, Height: 92m (JGD2000=WGS84)
Method:      VCR, 13cm F7.7 Refractor, WAT-120N(Slow shutter 8Fr),Limovie
Time signal: GHS, TIVi