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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: 2012/05/23
  STAR: TYC 1397-00691-1
  ASTEROID: (240) Vanadis

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 13.4 (WGS84)
	Longitude: E 15 14 08.4 (WGS84)
	Altitude:  593m         (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:    20:37:30

	D:    20:38:20.329 (+/- 0.01s)
        R:    20:38:22.949 (+/- 0.01s)    Duration        2.620 (+/- 0.02s)
                                          Mid time 20:38:21.639 (+/- 0.02s)

	E:    21:39:32     
	
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-902H2 Ultimate, CCIR, 1/2" Sony CCD-Sensor ICX429ALL
	Mode of recording: It=20ms (50 Img/s), Video CCIR, Y800, uncompressed AVI
	Device of recording: TIS DFG/USB2-lt Videograbber USB2.0 (Y800), XP32 Notebook Harddisk
        Time insertion: IOTA-VTI

7.OBSERVING CONDITIONS:
	Atmospheric transparency: good
	Wind: No
	Star image stability: good
	Minor planet visible: No
	Temperature: 290 Kelvin (+17 deg Celsius)
	
8.ADDITIONAL COMMENTS:
        Target star TYC 1397-00691-1, +10.1mag, 27deg Elevation.
    
        Only Clear glass filter (Astronomik) for CCD protection was used.

        Video evaluation accomplished with VirtualDub 1.10.0 and Tangra v1.4.0.439.

        Prediction data used from Steve Preston.
        Predicted event time was 20:38:23 UTC (+/- 2s) for my observing position.
        Predicted maximum duration was 3.8 seconds with a 4.3mag drop.
        Position was 6km from predicted central line in S direction
        between central line and path edge with a probability of 47.3%.
        Occultation event with a duration of 2.62s detected (It=20ms).
        
        3-D Position and timing
	Garmin GPS18x LVC
        Receiving 09 satellites
        Horizontal Dilution of Precision 0.8
        Geoidal separation 44.5m (Altitude 548.6MSL + 44.6 = 593.2 m in WGS84 datum)

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