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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: 2011/04/12
  STAR:  2UCAC 25860399
  ASTEROID: (511) Davida

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/Thaya
	Latitude:  N 48 47 13.5 (WGS84)
	Longitude: E 15 14 08.4 (WGS84)
	Altitude:  601m         (WGS84)
	Single/Multiple: Single

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4.TIMING OF EVENTS:
	Occultation recorded: NEGATIVE
	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:    01:12:54

	E:    01:16:03     
	
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
	Motor drive: Yes

6.TIMING & RECORDING:
	Timekeeping: GPS 1PPS Garmin 18x LVC + KIWI-OSD
        Sensor/Camera: WAT-120N, CCIR, 1/2" Sony CCD-Sensor ICX419ALL
	Mode of recording: It=1.28s (0.78125 Img/s), Video CCIR, Y800, uncompressed AVI
	Device of recording: TIS DFG/USB2-lt Videograbber USB2.0 (Y800), Notebook Harddisk
        Time insertion: KIWI-OSD 

7.OBSERVING CONDITIONS:
	Atmospheric transparency: bad
	Wind: No
	Star image stability: bad
	Minor planet visible: No
	Temperature: 280 Kelvin (+07 deg Celsius)
	
8.ADDITIONAL COMMENTS:
        Target star 2UCAC 25860399, +12.4mag, 12deg Elevation.

        Because of the relative low amplitude of 0.9mag a linear
        Gamma setting OFF = 1 was used on the WAT-120N camera.
        Thus an integration time of 1.28s (32 frames) was needed.
    
        Only Clear glass filter (Astronomik) for CCD protection was used.

        Video evaluation accomplished with VirtualDub 1.9.7 and Tangra v1.2.0.373

        Predicted event time was 01:14:24 UTC for my observing position.
        Predicted maximum duration was 41.4 seconds with a 0.9mag drop.
        Position was 390km from predicted central line in NE direction
        between path edge and 1-sigma line with a probability of 21.3%.
        No occultation event detected (It=1.28s).
        
        3-D Position and timing
	Garmin GPS18x LVC
        Receiving 08 satellites
        Horizontal Dilution of Precision 1.3
        Geoidal separation 44.5m (Altitude 556.3MSL + 44.5 = 600.8 m in WGS84 datum)

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