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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: 2016/09/23
  STAR: 2UCAC 40482441
  ASTEROID: (1071) Brita

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:  594m         (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:    23:36:29

	D1:    23:38:16.291 (+/-0.09s)
        R1:    23:38:17.891 (+/-0.09s)    Duration       1.600 (+/-0.18s)
 
                                          Duration       0.480 (+/-0.18s) 

	D2:    23:38:18.371 (+/-0.09s)
        R2:    23:38:19.971 (+/-0.09s)    Duration       1.600 (+/-0.18s)


	E:    23:39:49   
	
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: fair
	Wind: no
	Star image stability: fair
	Minor planet visible: no
	Temperature: 280 Kelvin (+07 deg Celsius)
	
8.ADDITIONAL COMMENTS:
        Target star 2UCAC 40482441, +12.3mag, 27deg Elevation.
        Only Clear glass filter (Astronomik) for CCD protection was used.

        Video evaluation accomplished with VirtualDub 1.10.0 and Tangra 3.5.9

        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 23:38:13 UTC (+/- 2s) for my observing position.
        Predicted maximum duration was 3.8 seconds with a 3.1mag drop.
        Position was 22km from predicted central line in WNW direction
        between center line and path edge with a probability of 77.9%.
        Two occultation events with short star reappearance between detected.
        Occultation Duration1: 1.600 (+/-0.18s)
	Star reappeared:       0.480 (+/-0.18s)
        Occultation Duration2: 1.600 (+/-0.18s)
        
        3-D Position and timing
	Garmin GPS18x LVC
        Receiving 08 satellites
        Horizontal Dilution of Precision 1.0
        Geoidal separation 44.5m (Altitude 549.0MSL + 44.5 = 593.5 m in WGS84 datum)

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