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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: 2010/12/19
  STAR: 2UCAC 41688164
  ASTEROID: (257) Silesia

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 13.6 (WGS84)
	Longitude: E 15 14 08.3 (WGS84)
	Altitude:  599m         (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:    00:40:56

	E:    00:44:37     
	
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=320ms (3.125 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: good
	Wind: No
	Star image stability: fair
	Minor planet visible: Yes
	Temperature: 256 Kelvin (-17 deg Celsius)
	
8.ADDITIONAL COMMENTS:
        Target star 2UCAC 41688164, +13.2mag, 65deg Elevation.
    
        Only Clear glass filter (Astronomik) for CCD protection was used.

        Video evaluation accomplished with VirtualDub 1.9.7 and Tangra v1.1.0.360

        Predicted event time was 00:42:29 UTC for my observing position.
        Predicted maximum duration was 6.3 seconds with a 0.8mag drop.
        Position was 22km from predicted central line in NNE direction
        between path edge and center line with a probability of 46.7%.
        For sure 0.8mag drop detection the target star signal was recorded unsaturated.
        No occultation event detected (It=320ms).
        
        3-D Position and timing
	Garmin GPS18x LVC
        Receiving 09 satellites
        Horizontal Dilution of Precision 1.2
        Geoidal separation 44.5m (Altitude 554.2MSL + 44.5 = 598.7 m in WGS84 datum)

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