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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: 2012/02/25
  STAR: 2UCAC 34430498
  ASTEROID: (266) Aline

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 13.2 (WGS84)
	Longitude: E 15 14 08.3 (WGS84)
	Altitude:  610m         (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:    18:47:59

        I-s:  18:49:17.084      clouds
        I-e:  18:49:22.284

        I-s:  18:49:32.524      clouds
        I-e:  18:49:35.084

	E:    18:50:00     
	
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=2.56s (0.390625 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: very bad
	Wind: 1-5m/s
	Star image stability: bad
	Minor planet visible: No
	Temperature: 278 Kelvin (+05 deg Celsius)
	
8.ADDITIONAL COMMENTS:
        Target star 2UCAC 34430498, +12.3mag, 48deg Elevation.

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

        Video evaluation accomplished with VirtualDub 1.10.0, Tangra v1.3.1.434

        Event data details according to the predictions from Steve Preston.
        Predicted event time was 18:49:00 UTC (+/- 17.9s) for my observing position.
        Predicted maximum duration was 28.8 seconds with a 1.5mag drop.
        Position was 130km from predicted central line in W direction
        between 1-sigma and 2-sigma limit with a probability of 14.5%.

        Due to moving clouds the transparency was extrem bad. So I had to use a very long
        integration time of 2.56s to make the target star visible on video frames. But several
        times the stars were covered total for few seconds by the moving clouds.
        No occultation event detected with a duration > 7.5s (It=2.56s).
        
        3-D Position and timing
	Garmin GPS18x LVC
        Receiving 04 satellites
        Horizontal Dilution of Precision
        Geoidal separation 44.6m (Altitude 565.2MSL + 44.6 = 609.8 m in WGS84 datum)

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