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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: 2009/08/05
  STAR:  2UCAC 22814920
  ASTEROID: (302) Clarissa

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 13.0 (WGS84)
	Longitude: E 15 14 08.5 (WGS84)
	Altitude:  602m         (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:    22:31:47

	E:    22:36:42     
	
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 Garmin 18x LVC + KIWI-OSD
        Sensor/Camera: WAT-120N, CCIR, 1/2" Sony CCD-Sensor ICX419ALL
	Mode of recording: It=640ms (1.5625 Img/s), Video CCIR, AVI, YUY2, Huffyuv,
	Device of recording: TIS DFG/USB2-lt Videograbber USB2.0, Notebook Harddisk
        Time insertion: KIWI-OSD 

7.OBSERVING CONDITIONS:
	Atmospheric transparency: bad
	Wind: No
	Star image stability: fair
	Minor planet visible: No
	Temperature: 288 Kelvin (+15 deg Celsius)
	
8.ADDITIONAL COMMENTS:
        Because of haze on the target sky and the full moon in only 6.5 deg distance, the star signal
        was very near to the background noise. To get a star signal with useful contrast the integration
        time was increased to multiple times of the normal essential value. Additional the gain was reduced.
        In this way the star was visible in the bright background.

        Target star 2UCAC 22814920, +12.9mag, 18deg Elevation.
        Faintest object visible on live video fields (It=640ms) was target star.

        Only Clear glass filter (Astronomik) for CCD protection was used.
        
        Video evaluation accomplished with VirtualDub1.8.6, AviSynth2.5 and Limovie0.9.29b

        No occultation detected (It=640ms)
        
        3-D Position and timing
	Garmin GPS18x LVC
        Receiving 09 satellites
        Horizontal Dilution of Precision 1.0
        Geoidal separation 44.5m (Altitude 557.2MSL + 44.5 = 601.7 m in WGS84 datum)

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