1 DATE : 13/MAR/2003
  STAR : TYC 0156-00065-1
  ASTEROID : (258)Tyche
 OBSERVER:
 Name: Stefano SPOSETTI
 Address: CH-6525 Gnosca, Switzerland
 E-mail: spo@bluewin.ch

3.OBSERVING STATION:
 Nearest city: CH-6500 Bellinzona
 Station: Gnosca Observatory
 Latitude: 46deg 13min 54sec (N)
 Longitude: 9deg 1min 30sec (E)
 Altitude: 260 m
 Single/Multiple: single

4.TIMING OF EVENTS:
 Occultation recorded: NO

5.TELESCOPE:
 Type: Newtonian
 Aperture: 40cm
 Magnification: -
 Mount: equatorial
 Motor drive: no

6.TIMING & RECORDING:
 Timekeeping: telephone speaking clock
 Mode of recording: CCD scan
 Device of recording: CCD

7.OBSERVING CONDITIONS:
 Atmospheric transparency: good
 Wind: no
 Star image stability: very poor !
 Temperature: 11 deg C

8.ADDITIONAL COMMENTS:
Due to CCD "drift scan" mode I observed no occultation in seven 70-seconds
intervals.
U.T. intervals :
from 19:30:34  to 19:31:44
from 19:31:55  to 19:33:05
from 19:33:15  to 19:34:25
from 19:34:35  to 19:35:45
from 19:35:55  to 19:37:05
from 19:37:15  to 19:38:25
from 19:38:35  to 19:39:45
Precision of time measurement: +-1sec.

Despite the very good transparency of the sky, the image stability (seeing) was very poor.
My CCD images show  not linear trails but ondulations and somewhere also points where
the light accumulated and points where the light was somewhat absent (thus simulating short
occultations) . In conclusion I can say that "no occultation of more than about 4 seconds
occured", because I cannot definitely rule out a short occultation.