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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: 2011/02/27
  STAR:  3UC220-097228
  ASTEROID: (2829) Bobhope

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 08.3 (WGS84)
	Altitude:  599m         (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:    18:57:58

	D:    18:59:58.960 (+/- 0.08s)
        R:    19:00:00.080 (+/- 0.08s)    Duration 1.12s (+/- 0.16s)
                                          Mid time 18:59:59.520 (+/- 0.16s)

	E:    19:02:11     
	
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=160ms (6.25 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: 1 - 3m/s (some stronger gusts)
	Star image stability: fair
	Minor planet visible: No
	Temperature: 271 Kelvin (-02 deg Celsius)
	
8.ADDITIONAL COMMENTS:
        Target star  3UC220-097228, +12.3mag, 49deg Elevation.
        Due to some stronger gusts the telescope was shaked several times
        during recording. 
    
        Only Clear glass filter (Astronomik) for CCD protection was used.

        Video evaluation accomplished with VirtualDub 1.9.7 and Tangra v1.2.0.373

        Because of the use of a WAT-120N in integration mode frame4 (It=160ms)
        a correction of -110ms was made to the video inserted times according to
        http://www.dangl.at/ausruest/vid_tim/vid_tim1.htm#wat_120n

        Predicted event time was 19:00:11 UTC for my observing position.
        Predicted maximum duration was 2.8 seconds with a 3.6mag drop.
        Position was 698km from predicted central line in SSE direction
        between 1-sigma line and 2-sigma line with a probability of 1.5%.
        Occultation event with a duration of 1.12s detected (It=160ms).
        
        3-D Position and timing
	Garmin GPS18x LVC
        Receiving 08 satellites
        Horizontal Dilution of Precision 1.2
        Geoidal separation 44.5m (Altitude 554.0MSL + 44.5 = 598.5 m in WGS84 datum)

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