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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: 2012/03/22
  STAR: TYC 0866-01137-1
  ASTEROID: (8) Flora

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 13.1 (WGS84)
	Longitude: E 15 14 06.8 (WGS84)
	Altitude:  609m         (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:    04:18:26

	E:    04:22:46     
	
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=0.64s (1.5625 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: Yes, separated until some minutes before event time
	Temperature: 276 Kelvin (+03 deg Celsius)
	
8.ADDITIONAL COMMENTS:
        Target star TYC 0866-01137-1, +10.6mag, 16deg Elevation.

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

        Although the sun was only -07deg below the east horizon, the recording was an easier
        task as expected. But the advantage was the big 170.5 deg elongation of (8) Flora.
        The rise of camera integration time and the reduction of gain gave a good star image
        with useful contrast on the relative bright western sky. The brightness situation was
        permanent changing. But due to the small mag drop of only 0.4mag an unchanged setting
        had to be chosen. And this setting had to work unchanged for all the recording duration.

        Video evaluation accomplished with VirtualDub 1.10.0, Tangra v1.4.0.435

        Event data details according to the predictions from Steve Preston.
        Predicted event time was 04:20:37 UTC (+/- 2.3s) for my observing position.
        Predicted maximum duration was 15.2 seconds with a 0.4mag drop.
        Position was 233km from predicted central line in SW direction
        between central line and path edge with a probability of 68.7%.
        No occultation event detected (It=0.64s).
        
        3-D Position and timing
	Garmin GPS18x LVC
        Receiving 07 satellites
        Horizontal Dilution of Precision 2.9
        Geoidal separation 44.6m (Altitude 564.2MSL + 44.6 = 608.8 m in WGS84 datum)

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