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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: 2010/11/05
  STAR: TYC 0637-00667-1
  ASTEROID: (769) Tatjana

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: Ottenschlag
	Latitude:  N 48 25 52.8 (WGS84)
	Longitude: E 15 12 49.0 (WGS84)
	Altitude:  899m         (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:    23:53:01

	E:    23:57:37     
	
5.TELESCOPE:
	Type: WO Megrez72 Doublet APO
	Focal length: 432mm
 	Aperture: 72 mm
	Magnification: video/primary focus/FOV 50.9'x38.2' (768x576, 3.98"x3.98" per pixel)
	Mount: Equatorial EQ6 SynScan
	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=320ms (3.125 Img/s), Video CCIR, Y800, uncompressed AVI
	Device of recording: TIS DFG/USB2-lt Videograbber USB2.0 (Y800), Notebook Harddisk
        Time insertion: KIWI-OSD 

7.OBSERVING CONDITIONS:
	Atmospheric transparency: good
	Wind: 5 - 10m/s
	Star image stability: fair
	Minor planet visible: No
	Temperature: 282 Kelvin (+09 deg Celsius)
	
8.ADDITIONAL COMMENTS:
        Target star TYC 0637-00667-1, +11.9mag, 50deg Elevation.
    
        Only Clear glass filter (Astronomik) for CCD protection was used.

        Video evaluation accomplished with VirtualDub 1.9.7 and Tangra v1.1.0.352

        Due to unsure cloud conditions for my home position I decided to change observation
        position in south direction. And at this new position, 39.1 km closer to the central line,
        the probability of a positive result was rised from 45% to 59%.

        In this night strong wind was a serious problem and made it impossible to use the long
        10" Newton telescope on my mount. So I had to use the small sized WO Megrez72 Doublet APO.
        My precalculations including aperture, f-stop and pixel size showed that an increase of the
        exposure time from 160ms to only 320ms should work. And it really did. The star was calm.
        No shakeing from the wind blowing with 10 m/s and some faster gusts was noticable. But I
        had to hold my table and notebook to prevent a turn over.
        
        Predicted event time was 23:55:16 UTC for my new observing position.
        Predicted maximum duration was 7.7 seconds with a 1.7mag drop.
        New position was 25km from predicted central line in N direction
        between central line and 1-sigma line with a probability of 59%.
        No occultation event detected (It=320ms).
        
        3-D Position and timing
	Garmin GPS18x LVC
        Receiving 08 satellites
        Horizontal Dilution of Precision 1.2
        Geoidal separation 44.5m (Altitude 854.0MSL + 44.5 = 898.5 m in WGS84 datum)

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