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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: 2018/05/20
  STAR: 4UC371-069226
  ASTEROID: Himalia (J6)

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 13.0 (WGS84)
	Longitude: E 15 14 08.5 (WGS84)
	Altitude:  584m         (WGS84)
                   539m         (MSL)
	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:    22:16:37

	E:    22:20:20
	
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, EQ8
	Motor drive: Yes

6.TIMING & RECORDING:
	Timekeeping: GPS Sensor Garmin GPS18xLVC
        Sensor/Camera: WAT-910BD System TACOS, CCIR, 1/2" CCD-Sensor
	Mode of recording: It=20ms (50 Img/s), Interlaced Video CCIR, Y800, uncompressed AVI
	Device of recording: TIS DFG/USB2-lt Videograbber USB2.0 (Y800), Notebook with SSD and OS W7/64P
        Time insertion: GPS time with VTI KIWI-OSD

7.OBSERVING CONDITIONS:
	Atmospheric transparency: fair
	Wind: no
	Star image stability: fair
	Minor planet visible: not with integration time 20ms
	Temperature: 286 Kelvin (+13 deg Celsius)
	
8.ADDITIONAL COMMENTS:
        Target star 4UC371-069226, +10.4mag, 25deg Elevation.
        Only Clear glass filter (Astronomik) for CCD protection was used.

        Video evaluation accomplished with VirtualDub 1.10.0 and Tangra 3.6.16

        Event data details according to the predictions from Occult Watcher Feed RIO-TNO.
        Predicted event time was 22:18:11 UTC (+/- 3s) for my observing position.
        Predicted maximum duration was 8.8 seconds with a 4.6mag drop.
        Position was 553km from predicted central line in SW direction
        between 2-sigma line and 3-sigma line with a probability of 0.5%.
        No occultation event detected (It=20ms).
        
        3-D Position and timing
	Garmin GPS18x LVC
        Receiving 10 satellites
        Horizontal Dilution of Precision 1.0
        Geoidal separation 44.5m (Altitude 539.3MSL + 44.5 = 583.8 m in WGS84 datum)

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