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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: 2008/06/06
  STAR: TYC 0291-00146-1
  ASTEROID: (5) Astraea

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 13.5 (WGS84)
	Longitude: E 15 14 06.5 (WGS84)
	Altitude:  594m         (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:    20:57:24

        D:    21:01:01.474     0.00  (+/- 0.01)
        R:    21:01:13.095     0.00  (+/- 0.01)
                               Duration 11.621s (+/-20ms)
                               Event mid time 21:01:07.285

	E:    21:04:18         
	
5.TELESCOPE:
	Type: Newton
	Focal length: 1200mm
 	Aperture: 254 mm
	Magnification: video/primary focus/FOV 15.8'x13.7' (640x576, 1.48"x1.43" per pixel)
	Mount: Equatorial
	Motor drive: Yes

6.TIMING & RECORDING:
	Timekeeping: GPS 1PPS Garmin 18 LVC + KIWI-OSD
        Sensor/Camera: WAT-120N, CCIR, 1/2" Sony CCD-Sensor ICX419ALL, 768x576
	Mode of recording: It=20ms (50 Img/s), Video CCIR, AVI, YUY2, Huffyuv,
	Device of recording: Xpert V-Stream Videograbber USB2.0, Notebook Harddisk
        Time insertion: KIWI-OSD 

7.OBSERVING CONDITIONS:
	Atmospheric transparency: fair
	Wind: No
	Star image stability: fair
	Minor planet visible: Yes (see comments)
	Temperature: 286 Kelvin (+13 deg Celsius)
	
8.ADDITIONAL COMMENTS:
        Video evaluation accomblished with VirtualDub1.7.8 and Limovie0.9.28c
        Occultation with a duration of 11.621s (+/-20ms) detected, It= 20ms.
        Disappearance was gradual within 8 video fields = 160ms.
        Reappearance was nearly linear within 6 video fields = 120ms.
        Real D/R times determined from recorded video with the use of the
        correction table at http://www.dangl.at/ausruest/vid_tim/vid_tim1.htm#wat_120n

        Path width was 195 kilometers.
        The 1 sigma uncertainty interval was +/- 0.23 path widths.
        My position was -46.9 kilometers (East) from predicted path central line.
        The predicted occultation probability on my position was 86.8%
        The estimated maximum duration was 16.8 seconds.

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

        Using an integration time of 160ms the asteroid Astraea was visible bright and
        separated clearly until some minutes before and again few minutes after the
        event time. During occultation Astraea was visible faint in some video frames.

        Target star TYC 0291-00146-1, +8.9mag, 35deg Elevation.
        Faintest object visible on live video fields was asteroid Astraea.

        3-D Position and timing
	Garmin GPS18 LVC
        Receiving 09 satellites
        Horizontal Dilution of Precision 1.1
        Geoidal separation 44.4m (Altitude 550.0MSL + 44.4 = 594.4m in WGS84 datum)

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