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                ASTERIODAL OCCULTATION - REPORT FORM

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                      EAON & IOTA-ES

              EUROPEAN ASTEROIDAL OCCULTATION NETWORK

   INTERNATIONAL OCCULTATION TIMING ASSOCIATION EUROPEAN SECTION

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1 DATE : 20/12/2008
 STAR : TYC 2397-00753-1u
 ASTEROID : (312) Pierretta

2.OBSERVER:
Name: Stefano SPOSETTI
Address: CH-6525 Gnosca, Switzerland
E-mail: stefanosposetti@ticino.com

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

5.TELESCOPE:
Type: Newtonian
Aperture: 40cm
Magnification: -
Mount: equatorial
Motor drive: yes

6.TIMING & RECORDING:
        Occultation recorded:   NEGATIVE
        Personal Equation Substracted: No because of electronic timing
        Event Time in UT
        Code:           HH:MM:SS.ss  S.ss
        Code:           HH:MM:SS.ss  S.ss
        S        19:34:30
        D
        R
        E        19:39:30


Timekeeping: via Computer ( "Dimension4" software) .
Mode of recording: CCD drift-scan ("Winscan 207" software)
Device of recording:  CCD

7.OBSERVING CONDITIONS:
Atmospheric transparency: good
Wind: none at the observatory position
Star image stability: poor because of high altitude wind.
Driftscan speed at at 0,05s/pixel.
Sampling: 1 pixel = 1,2 arcsec.
FWHM of stars: 6 arcsec.

8. NOTES:
Because of poor seeing, I consider the time resolution of the drift-scan image no better than 0,3s. No occultation occured in a time interval higher than this resolution.