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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: 2016/01/14
  STAR: TYC 1368-01896-1
  ASTEROID: (88) Thisbe

2.OBSERVER:
  	Name: Gerhard Dangl
	Phone: ++43-(0)2842-53908
	Address: AUSTRIA, A-3830, Nonndorf 12
	E-mail: gerhard@dangl.at

3.OBSERVING STATION:
	Nearest city: Waidhofen an der Thaya
	Latitude:  N 48 47 13.5 (WGS84)
	Longitude: E 15 14 08.2 (WGS84)
	Altitude:  589m         (WGS84)
	Single/Multiple: Single

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4.TIMING OF EVENTS:
	Occultation recorded: POSITIVE
	Type of event:
	"S"tart observation; "I"nterrupt-"s"tart; "D"isappearance;
	"B"link; "F"lash; "E"nd observation; "I"nterrupt-"e"nd;
	"R"eappearance; "O"ther (specify)
	
	Personal Equation Substracted: No
	Event Time (UT)		P.E. Accuracy + Comments
	code: HH:MM:SS.ss       S.ss  S.ss
	
	S:    19:10:19

	D:    19:13:11.643 (+/-0.09s)
        R:    19:13:26.203 (+/-0.09s)    Duration       14.560 (+/-0.18s)
                                         Mid time 19:13:18.923 (+/-0.09s)

	E:    19:14:45   
	
5.TELESCOPE:
	Type: Newton
	Focal length: 1200mm
 	Aperture: 254 mm
	Magnification: video/primary focus/FOV 18.3'x13.7' (768x576, 1.43"x1.43" per pixel)
	Mount: Equatorial, EQ8
	Motor drive: Yes

6.TIMING & RECORDING:
	Timekeeping: GPS Sensor Garmin GPS18xLVC
        Sensor/Camera: WAT-120N, CCIR, 1/2" Sony CCD-Sensor ICX419ALL
	Mode of recording: It=160ms (6.25 Img/s), Video CCIR, Y800, uncompressed AVI
	Device of recording: TIS DFG/USB2-lt Videograbber USB2.0 (Y800), Notebook with SSD and OS W7/64P
        Time insertion: KIWI-OSD VTI

7.OBSERVING CONDITIONS:
	Atmospheric transparency: bad (moving clouds)
	Wind: no
	Star image stability: fair
	Minor planet visible: yes, separated until few minutes before occultation
	Temperature: 270 Kelvin (-03 deg Celsius)
	
8.ADDITIONAL COMMENTS:
        Target star TYC 1368-01896-1, +10.9mag, 36deg Elevation.
        Only Clear glass filter (Astronomik) for CCD protection was used.

        Because of a cloud layer I decided the usage of the WAT-120N with integration feature.
        About 10 seconds before occultation start the moving clouds densitiy was rising again.
        So I had to increase the integration time very fast to 160ms with cable controll.
        Otherwise this occultation event would have got lost at my location.

        Video evaluation accomplished with VirtualDub 1.10.0 and Tangra 3.5.3

        Because of the use of a WAT-120N CCIR in integration mode Frame4 (It=160ms),
        a correction of -110ms was performed at the times inserted in the video by the VTI.
        The correction value is according to measurements results with EXposure Time Analyzer - EXTA.
        http://www.dangl.at/exta/exta_e.htm
        So all event times in this report are corrected times representing the real event times in UTC.

        Event data details according to the predictions from IOTA (Steve Preston).
        Predicted event time was 19:13:14 UTC (+/- 1s) for my observing position.
        Predicted maximum duration was 14.6 seconds with a 1.0mag drop.
        Position was 45km from predicted central line in NNW direction
        between center line and path edge with a probability of 100%.
        Occultation event detected with duration 14.56s +/-0.18s (It=0.160s).
        
        3-D Position and timing
	Garmin GPS18x LVC
        Receiving 09 satellites
        Horizontal Dilution of Precision 0.9
        Geoidal separation 44.5m (Altitude 544.5MSL + 44.5 = 589.0 m in WGS84 datum)

        Gerhard Dangl
        gerhard@dangl.at
        www.dangl.at/
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