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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: 2013/04/17
  STAR: TYC 1962-01062-1
  ASTEROID: (351) Yrsa

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 13.2 (WGS84)
	Longitude: E 15 14 08.4 (WGS84)
	Altitude:  593m         (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:    21:39:40

	E:    21:44:02     
	
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-910HX/RC, CCIR, 1/2" Sony CCD-Sensor ICX
	Mode of recording: It=20ms (50 Img/s), gain=+41dB, 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: bad (Cirrus)
	Wind: no
	Star image stability: good
	Minor planet visible: yes, with longer It separated until few minutes before event
	Temperature: 283 Kelvin (+10 deg Celsius)
	
8.ADDITIONAL COMMENTS:
        Target star TYC 1962-01062-1, +9.8mag, 50deg Elevation.
        Only Clear glass filter (Astronomik) for CCD protection was used.

        Video recording with VirtualDub 1.9.11 running on HP i5 notebook with W7P/64Bit system
        Video evaluation accomplished with VirtualDub 1.10.0 and Tangra v1.4.0.496

        Event data details according to the predictions from Steve Preston.
        Predicted event time was 21:42:37 UTC (+/- 23s) for my observing position.
        Predicted maximum duration was 5.1 seconds with a 3.5mag drop.
        Position was 155km from predicted central line in NE direction
        between path edge and 1-sigma limit with a probability of 8.9%.
        No occultation event detected (It=20ms).
        
        3-D Position and timing
	GlobalSat EM-406A GPS Board
        Receiving 06 satellites
        Horizontal Dilution of Precision 1.1
        Geoidal separation 44.6m (Altitude 548.4MSL + 44.6 = 593.0 m in WGS84 datum)

        2013/04/22
        Gerhard Dangl
        gerhard@dangl.at
        www.dangl.at/
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