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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: 11 Dec 2022
   STAR: UCAC4 676-037147
   ASTEROID: (624) Hektor

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

3. OBSERVING STATION
   Nearest city: CH-6760 Faido
   Longitude:   8.80456 E
   Latitude:  46.47334 N
   Altitude: 688 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  - 18:38:00
D  - 18 52 42.0 ± 0.3 s
R  - 18 52 45.5 ± 0.3 s
E  - 19:07:30

   Duration : 3.5 ± 0.5 sec
  
5. TELESCOPE

   Type: Schmidt-Cassegrain, Celestron 8-inch
   Aperture: 200 mm
   Focal length: ~ 800 mm (with focal reducer)
   Magnification: -
   Mount: Equatorial
   Motor drive: Yes

6. TIMING & RECORDING

   -Camera/Sensor: Videocamera WAT-910HX-RC, CCIR, 1/2", ICX429ALL sensor
   -Videocamera settings: Shutter = x32; Gain = 41/41; Gamma = 1.00
   -Device of recording: Personal computer
   -Videograbber: Logilink USB Grabber VG0001, composite input
   -Software: Virtualdub v. 1.10.4, saved on Harddisk as Lagarith compressed file
   -Time insertion device: IOTA-VTI, v.1.1.42
   -Timekeeping: GPS 1PPS (US Global Sat EM-406A)
   -Integration time: 0.640 s

7. OBSERVING CONDITIONS
   
   -Atmospheric transparency: good
   -Wind: light wind at the observing place 
   -Star image stability: fair
   -Asteroid visible during the occultation: barely

8. ADDITIONAL COMMENTS
   Prediction:
   -Occultwatcher, Luckystar
   -Rank: 100
   -Probability: 100.0 %
   -Combined magnitude: 13.9 magV, 13.5 magR
   -Star magnitude: 14.1 mag
   -Asteroid magnitude: 14.6 mag
   -Lightdrop: 1.1 mag
   -Max duration: 13.1 s
   -Event time: 18:52:41 UT
   -Error in time: 4 s
   -Moon distance: 38 deg
   -Moon illumination: 88 %
   -https://cloud.occultwatcher.net/event/709-624-77615-650838-U037147

   Other comments:
   -Mobile station
   -Target sky position: elevation = 43 deg, azimut = 64 deg
   -Tangra v. 3.7.4 was used to generate the lightcurve (aperture photometry, average background). Time reference: Start Frame 
   -The so-called "Dangl correction" with a correction of -0.660 s  was applied
   -AOTA v4.2022.11.10 was used to calculate D and R times and uncertainties
   -No other luminosity drops longer than 2 integration frames outside the main occultation were detected
   -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_11_Hektor_Faido.png