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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: 2013/04/14
  STAR: 2UCAC 39647755
  ASTEROID: (925) Alphonsina

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 13.6 (WGS84)
	Longitude: E 15 14 08.2 (WGS84)
	Altitude:  598m         (WGS84)
	Single/Multiple: Single

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4.TIMING OF EVENTS:
	Occultation recorded: POSITIVE
	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:    20:01:48

	D:    20:02:33.591 (+/- 0.04s)
        R:    20:02:35.671 (+/- 0.04s)    Duration        2.080 (+/- 0.08s)  
                                          Mid time 20:02:34.631 (+/- 0.08s)

	E:    20:04:03     
	
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-910HX/RC, CCIR, 1/2" Sony CCD-Sensor ICX249AL
	Mode of recording: It=80ms (12. 5 Img/s), gain=+38dB, 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: good
	Wind: no
	Star image stability: good
	Minor planet visible: yes, with longer It separated until few minutes before event
	Temperature: 280 Kelvin (+07 deg Celsius)
	
8.ADDITIONAL COMMENTS:
        Target star 2UCAC 39647755, +12.2mag, 38deg Elevation.
        Only Clear glass filter (Astronomik) for CCD protection was used.

        Video recording with VirtualDub 1.10.0 running on HP notebook with W7/64Bit system
        Video evaluation accomplished with VirtualDub 1.10.0 and Tangra v1.4.0.496

        This may be the first recording of a positive asteroidal star occultation,
        captured with the new integrating video camera WAT-910HX.

        Because of the use of a WAT-910HX/RC in integration mode X4 (It=80ms),
        a correction of -50ms was performed at the times inserted in the video by the VTI
        The correction value is according to measurements results with EXposure Time Analyzer - EXTA.
        http://www.dangl.at/exta/exta_e.htm
        So all event times in this report are corrected times representing the real event times.

        Event data details according to the predictions from Steve Preston.
        Predicted event time was 20:02:40 UTC (+/- 4s) for my observing position.
        Predicted maximum duration was 3.2 seconds with a 1.3mag drop.
        Position was 69km from predicted central line in NE direction
        between path edge and 1-sigma limit with a probability of 30.0%.
        Occultation event with a duration of 2.08s detected (It=80ms).
 
        3-D Position and timing
	GlobalSat EM-406A GPS Board
        Receiving 07 satellites
        Horizontal Dilution of Precision 1.8
        Geoidal separation 44.6m (Altitude 553.1MSL + 44.6 = 597.7 m in WGS84 datum)

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