+--------------------------------+ +--------------------------------+ ASTERIODAL OCCULTATION - REPORT FORM +--------------------------------+ +--------------------------------+ EAON & IOTA-ES EUROPEAN ASTEROIDAL OCCULTATION NETWORK INTERNATIONAL OCCULTATION TIMING ASSOCIATION EUROPEAN SECTION +--------------------------------+ +--------------------------------+ 1.DATE: 2013/08/30 STAR: TYC 1788-01050-1 ASTEROID: (583) Klotilde 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 13.6 (WGS84) Longitude: E 15 14 08.2 (WGS84) Altitude: 595m (WGS84) Single/Multiple: Single +--------------------------------------------------------------------+ 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: 23:19:28 E: 23:22:31 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-120N, CCIR, 1/2" Sony CCD-Sensor ICX419ALL Mode of recording: It=160ms to 2.56s (6.25 to 0.39 Img/s), Video CCIR, Y800, uncompressed AVI Device of recording: TIS DFG/USB2-lt Videograbber USB2.0 (Y800), Notebook Harddisk Time insertion: IOTA-VTI 7.OBSERVING CONDITIONS: Atmospheric transparency: very bad (moving clouds) Wind: no Star image stability: fair Minor planet visible: no Temperature: 285 Kelvin (+12 deg Celsius) 8.ADDITIONAL COMMENTS: Target star TYC 1788-01050-1, +11.5mag, 34deg Elevation. Only Clear glass filter (Astronomik) for CCD protection was used. Due to moving clouds the It of the camera had to be changed permanently. So the target star or reference stars did never disappeare for more than one It sequence. Video evaluation accomplished with VirtualDub 1.10.0, Tangra v1.4.0.497 Event data details according to the predictions from Steve Preston. Predicted event time was 23:20:53 UTC (+/- 8s) for my observing position. Predicted maximum duration was 11.7 seconds with a 3.4mag drop. Position was 138km from predicted central line in NW direction between path edge and 1-sigma limit with a probability of 21.3%. No occultation event detected (It=0.16s - 2.56s). 3-D Position and timing GlobalSat EM-406A GPS Board Receiving 07 satellites Horizontal Dilution of Precision 1.4 Geoidal separation 44.6m (Altitude 550.5MSL + 44.6 = 595.1 m in WGS84 datum) Gerhard Dangl gerhard@dangl.at www.dangl.at/ +--------------------------------------------------------------------+