TYC 4836-00860-1 (mag10.6) by (485)Genua  on 2005 Dec. 27

3 observers(Aikawa, Hamanowa, Uehara) reports complicated behavior.
It may be an unknown double star or diffraction phenomena.

**** Successful observation:
Observer:    Reijin Aikawa    (JOIN:8476,8484)
Place:       Sakado, Saitama, Japan
Long.: 139o 27' 02" E, Lat.: 35o 56' 45" N, Height: 21m (Tokyo Datum)
Long.: 139o 26' 50" E, Lat.: 35o 56' 56" N, Height: 21m (JGD2000=WGS84)
Method:      Visual, 20.3cm F10 Schmidt Cass, x133, Tape recorder
Time signal: TEL, Cellular phone, Stop watch
Result:      D 12h 23m 04.1s +/-0.5s  momentarily
             R 12h 23m 09.3s +0.5/-1s
            (P.E. delay 0.7sec corrected)
    Reappearance seemed one or two times blink.
    It wasn't dark completely during occultation. (maybe brightness of Asteroid)

Observer:    Hiromi Hamanowa, Hiroko Hamanowa  (JOIN:8479,8491,8492)
Place:       Takahagi, Ibaraki, Japan
Long.: 140o 36' 01" E, Lat.: 36o 44' 33" N, Height: 385m (JGD2000=WGS84)
Method:      Visual, 25cm F10 Shmidt Cass, 17mm eyepiece, Voice recorded by VCR
Time signal: GHS, TIVi
Note:        Certainty 2.5/3(sure of event)
Result:      D 12h 22m 47.9s +/-0.3s
             R 12h 22m 51.0s +/-0.3s
            (P.E. 0.5s corrected)
    One more decline may have occurred just after 22m 51.0s.

Observer:  Hiroyuki Tomioka  (JOIN:8485)
Place:       Hitachi, Ibaraki, Japan
Long.: 140o 41' 08" E, Lat.: 36o 38' 32" N, Height: 33m (JGD2000=WGS84)
Method:      Visual, 30cm Reflector, x200, Stop watch
Time signal: GPS
Result:      D 12h 22m 43.0s
             R 12h 22m 50.6s
    It wasn't dark completely during occultation. (maybe brightness of Asteroid)
Note:  Reported by Tsutomu Hayamizu.

Observer:    Sadaharu Uehara    (JOIN:8496)
Place:       Tsukuba, Ibaraki, Japan
Long.: 140o 07' 04.2" E, Lat.: 36o 05' 11.2" N, Height: 30m (JGD2000=WGS84)
Method:      Visual, 20cm Reflector, x107, audio recorder
Time signal: TEL, Stop watch
Note:        Certainty 2/3(possibly spurious)
Result:      D 12h 22m 53.5s +/-1.5s
             R 12h 22m 04.1s +/-0.2s
    Disappearance seemed gradual or the shape of stairs decline.
    It wasn't dark completely during occultation. (maybe brightness of Asteroid)

Note:  Reported by Tsutomu Hayamizu.


** Negative observations:
Observer:    Isao Ootsuki   (JOIN:8471)
Place:       Marumori town, Miyagi, Japan
Long.: 140o 40'47" E, Lat: 37o54'01" N, Height: 190m  (JGD2000=WGS84)
Method:      Visual, 31cm F6 Newtonian, x100, Tape-recorder
Time signal: GHS, TEL
Note:        Certainty 2/3(=possibly spurious)

Observer:    Norio Sasanuma (JOIN:8472)
Place:       Toshima, Tokyo, Japan
Long.: 139o 44' 35.8" E, Lat.: 35o 44' 14.4" N, Height:  31m (JGD2000=WGS84)
Method:      VCR, 30cm F12 Cass, 60mm Eyepiece, WAT-100N
Time signal: Internal time counter of VCR

Observer:    Hideo Takashima  (JOIN:8477)
Place:       Kashiwa, Chiba, Japan
Long.: 139o 57' 22" E, Lat.: 35o 50' 37" N, Height: 39m (Tokyo Datum)
Long.: 139o 57' 10.3" E, Lat.: 35o 50' 48.6" N, Height: 39m (JGD2000=WGS84)
Method:      VCR, 20cm F2 Schmidt, WAT-100N
Time signal: GHS, TIVi


** Other observation:
Observer:    Akie Hashimoto (JOIN:8474)
Place:       Chichibu, Saitama, Japan
Long.: 139o 01' 59.6" E, Lat.: 35o 58' 04.5" N, Height: 355m (JGD2000=WGS84)
Method:      Visual, 18cm Newtonian x144.
Time signal: GHS, Stop watch
Note:  12h21m    to 12h23m15s  -- interfered by cloud
       12h23m15s to 12h23m20s  -- cloud is clearing
       12h23m20s to 12h25m     -- Clear sky but no event occurred