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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: 10 Dec 2022
   STAR: UCAC4 531-004984
   ASTEROID: Titania (III)

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: POSITIVE
   Type of event:
   "S"tart observation;
   "I"nterrupt-start;
   "D"isappearance;
   "B"link;
   "F"lash;
   "E"nd observation;
   "I"nterrupt-end;
   "R"eappearance;
   "O"ther (specify)

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

S - 21:46:20
D - 21:51:39.2 ± 2.7 s
R - 21:52:52.2 ± 2.7 s
E - 21:58:20

   Duration: 73.0 ± 3.4 s
  
5. TELESCOPE
   -Type: Schmidt-Cassegrain, Celestron 11-inch
   -Aperture: 280 mm
   -Focal length: 930 mm (with focal reducer)
   -Magnification: FOV 23x18 arcmin
   -Mount: Equatorial
   -Motor drive: Yes

6. TIMING & RECORDING
   -Sensor/Camera: Videocamera WAT-910HX-RC, CCIR, 1/2", ICX429ALL sensor
   -Videocamera settings: Shutter = x16; Gain = 41/41; Gamma = 1.00
   -Device of recording: Personal computer, Hauppauge WinTV885 PCI, composite input, Virtualdub acquiring software, saved on Harddisk as compressed Lagarith file
   -Timekeeping: GPS 1PPS (US Global Sat EM-406A)
   -Time insertion device: IOTA-VTI, v.1.1.42
   -Integration time: 0.320 s

7. OBSERVING CONDITIONS
   -Atmospheric transparency: good
   -Wind: fair/strong
   -Star image stability: fair/bad
   -Minor Planet Visible: yes

8. ADDITIONAL COMMENTS
   Prediction:
   -Occultwatcher, WWPlanetsMoons
   -Rank: 100
   -Probability: 99.7 %
   -Combined magnitude: 13.6 mag
   -Star magnitude: 15.2 mag
   -Asteroid magnitude: 13.9 mag
   -Lightdrop: 0.3 mag
   -Max duration: 72.8 s
   -Event time: 21:51:36 UT
   -Error in time: 13 s
   -Moon distance: 64 deg
   -Moon illumination: 93 %
   -https://cloud.occultwatcher.net/event/708-P7M03-40845-649018-U004984

   Other comments:
   -Target sky position: elevation = 58 deg, azimut = 202 deg
   -Pymovie was used to generate the lightcurve and PyOTE to analyzed it
   -Time insertion delay correction of -0.34 s for WAT-910HX applied
   -Containment intervals: 0.9500
   -Measured lightdrop:  0.277 ± 0.035 (0.95 ci) 
   -Many thanks to Eric Frappa who checked and refined the analysis
   -The lightcurve can be seen here:
https://sposetti.ch/wp-content/uploads/2022/12/2022_12_10_Titania_Gnosca.png