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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: 2012/04/18
  STAR: 3UC140-175145
  ASTEROID: (1957) Angara

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 13.4 (WGS84)
	Longitude: E 15 14 08.2 (WGS84)
	Altitude:  607m         (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:    00:03:47

	E:    00:07:03     
	
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, GlobalSat EM-406A GPS Board + IOTA-VTI (Demo3) V1.1.43
        Sensor/Camera: WAT-120N, CCIR, 1/2" Sony CCD-Sensor ICX419ALL
	Mode of recording: It=0.08s (12.5 Img/s), Video CCIR, Y800, uncompressed AVI
	Device of recording: TIS DFG/USB2-lt Videograbber USB2.0 (Y800), Notebook Harddisk
        Time insertion: IOTA-VTI

7.OBSERVING CONDITIONS:
	Atmospheric transparency: fair
	Wind: No
	Star image stability: fair
	Minor planet visible: No
	Temperature: 270 Kelvin (-03 deg Celsius)
	
8.ADDITIONAL COMMENTS:
        Target star 3UC140-175145, +11.9mag, 19deg Elevation.

        Only Clear glass filter (Astronomik) for CCD protection was used.

        Video evaluation accomplished with VirtualDub 1.10.0, Tangra v1.4.0.435

        Event data details according to the predictions from EAN.
        Predicted event time was 00:05:23 UTC (+/- 21s) for my observing position.
        Predicted maximum duration was 2.8 seconds with a 3.9mag drop.
        Position was 108km from predicted central line in NW direction
        between path edge and 1-sigma line with a probability of 5.1%.
        No occultation event detected (It=0.08s).
        
        3-D Position and timing
	Garmin GPS18x LVC
        Receiving 07 satellites
        Horizontal Dilution of Precision 1.4
        Geoidal separation 44.6m (Altitude 562.0MSL + 44.6 = 606.6 m in WGS84 datum)

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