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ASTEROIDAL 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: 25 Apr 2020
   STAR: UCAC4 496-064872
   ASTEROID: (471325) 2011 KT19

2. OBSERVER
   Name: Stefano SPOSETTI
   Address: 6525 GNOSCA - Switzerland
   Email: stefanosposetti@ticino.com

3. OBSERVING STATION
   Nearest city: CH-6525 Gnosca
   Longitude: 9d 1m 26.5s (E)
   Latitude: 46d 13m 53.2s (N)
   Altitude: 260 m
   (WGS84)

4. TIMING OF EVENTS
   Occultation recorded: NEGATIVE
   Type of event:
   "S"tart observation;
   "E"nd observation;

   Personal Equation Substracted: -
   Event Time (UTC) Accuracy + Comments
   code: HH:MM:SS.ss S.sss

-S : 20:40:36
-E : 20:50:34

5. TELESCOPE
   -Type: Newton
   -Aperture: 420 mm
   -Focal length: 1640 mm
   -Mount: Equatorial
   -Motor drive: Yes

6. TIMING & RECORDING
   -Camera/Sensor: Videocamera  QHY174M-GPS, SONY IMX174 CMOS sensor
   -Device of recording: Personal computer, USB3 input, SharpCap v. 3.2 software, saved on SSD Harddisk as SER file
   -binning 2x2, uncooled, camera bit depth = 16
   -Timekeeping: GPS UTC clock
   -Integration time: 0.600 s (details in point #8)

7. OBSERVING CONDITIONS
   -Atmospheric transparency: variable, good to bad
   -Wind: -
   -Star image stability: fair
   -Minor Planet Visible: -

8. ADDITIONAL COMMENTS
   -Start and End times of the observation window were determined by clouds.
   -The integration time was 0.200 s during most of the recording. When the sky transparency changed, the integration time was incremented sometimes to 0.600 s. Therefore the upper limit of 0.600 s was given at point #6.
   -TNO object
   -Occultwatcher, LuckyStar prediction, 3.7 % probability