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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: 21 Apr 2018
   STAR: TYC 0408-00029-1
   ASTEROID: (130) Elektra

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

3. OBSERVING STATION
    
   Nearest city: CH-Bellinzona
   Station: LiBe
   Longitude (DD MM SS.s): 09 00 51.0 E
   Latitude (DD MM SS.s):  46 11 50.0 N
   Altitude: 240m
   (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 : 00:30:40
-D : 00:31:34.78 ± 0.080 s
-R : 00:31:50.99 ± 0.080 s
-E : 00:32:20

   Duration: 16.21 s ± 0.160 s

5. TELESCOPE
   
   -Type: Schmidt-Cassegrain, Celestron 8-inch
   -Aperture: 200 mm
   -Focal length: about 700 mm (with 2 focal reducers)
   -Magnification: -
   -Mount: Equatorial
   -Motor drive: No

6. TIMING & RECORDING
   
   -Camera/Sensor: Videocamera WAT-910HX-RC, CCIR, 1/2"
   -Videocamera settings: Shutter = x8, Gain = 41/41, Gamma = 1.00, other settings = OFF or NULL
   -Device of recording: personal computer
   -Videograbber: Logilink USB Grabber VG0001, composite input
   -Software: Virtualdub v. 1.8, saved on Harddisk as Huffyuv compressed file
   
   -Timekeeping: GPS 1PPS (US Global Sat EM-406A)
   -Time insertion device: IOTA-VTI v. 1.1.42
   -Integration time: 0.160 s

7. OBSERVING CONDITIONS
   
   -Atmospheric transparency: good
   -Wind: fair 
   -Star image stability: fair
   -Minor Planet visible during the occultation: barely

8. ADDITIONAL COMMENTS
   
   Prediction:
   -Occultwatcher, IOTA feed
   -Rank: 100
   -Probability: about 85 %
   -Combined magnitude: 11.3 mag
   -Star magnitude: 11.4 mag
   -Asteroid magnitude: 12.9 mag
   -Lightdrop: 1.6 - 2.0 mag
   -Max duration: 20.5 s
   -Event time: 00:31:37 UT
   -Error in time: 3 s
   -Moon distance: below horizon
   -Moon illumination: -

   Other comments:
   -Automatic observation, pre-pointing method
   -Sky position of the target: elevation = 40 deg, azimut = 133 deg
   -Tangra v. 3.6.15 was used to generate the lightcurve (aperture photometry, average background)
   -S/N of the target (before D and after R) about 10
   -A correction of - 0.100 s was applied because of the use of an integration camera (so called "Dangl-correction")
   -A lightcurve can be seen here:
http://sposetti.ch/wp-content/uploads/2018/04/2018_04_21_Elektra_Bellinzona_Sposetti.png