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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: 2010/04/20
  STAR: 3UC223-027733
  ASTEROID: (11397) 1998 XX93

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 13.1 (WGS84)
	Longitude: E 15 14 07.3 (WGS84)
	Altitude:  600m         (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:    20:20:57

	E:    20:24:21     
	
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: very bad, horizon clouds and half moon nearby
	Wind: 1 - 5 m/s
	Star image stability: fair
	Minor planet visible: No
	Temperature: 281 Kelvin (+8 deg Celsius)
	
8.ADDITIONAL COMMENTS:
        Target star 3UC223-027733, +12.9mag, 14deg Elevation.
        Due to very bad atmospheric transparency a very long integration time had to be used.
    
        Only Clear glass filter (Astronomik) for CCD protection was used.

        Very low S/N ratio. Video evaluation accomplished with VirtualDub1.9.7 frame by frame.

        Predicted event time was 20:22:21 UTC for my observing position.
        Predicted maximum duration was 1.0 seconds with 4.9mag drop.
        Position was 918km from central line in NE azimut direction
        between path and 1-sigma line with a probability of 1.0%.
        No occultation event detected (It=1.28s).
        
        3-D Position and timing
	Garmin GPS18x LVC
        Receiving 09 satellites
        Horizontal Dilution of Precision 1.0
        Geoidal separation 44.5m (Altitude 555.3MSL + 44.5 = 599.8 m in WGS84 datum)

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