+--------------------------------+ +--------------------------------+ ASTERIODAL OCCULTATION - REPORT FORM +--------------------------------+ +--------------------------------+ EAON & IOTA-ES EUROPEAN ASTEROIDAL OCCULTATION NETWORK INTERNATIONAL OCCULTATION TIMING ASSOCIATION EUROPEAN SECTION +--------------------------------+ +--------------------------------+ 1.DATE: 2014/04/18 STAR: 2UCAC 38779497 ASTEROID: (241) Germania 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 13.5 (WGS84) Longitude: E 15 14 08.1 (WGS84) Altitude: 598m (WGS84) Single/Multiple: Single +--------------------------------------------------------------------+ 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: 20:57:55 D: 21:00:00.321 (+/- 0.33s) R: 21:00:08.642 (+/- 0.33s) Duration 8.321 (+/- 0.66s) Mid time 21:00:04.482 (+/- 0.66s) E: 21:01:20 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 Motor drive: Yes 6.TIMING & RECORDING: Timekeeping: GPS Sensor Garmin GPS18xLVC 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 VTI 7.OBSERVING CONDITIONS: Atmospheric transparency: bad (cloudy) Wind: no Star image stability: bad Minor planet visible: no Temperature: 277 Kelvin (+04 deg Celsius) 8.ADDITIONAL COMMENTS: Target star 2UCAC 38779497, +12.5mag, 28deg Elevation. Only Clear glass filter (Astronomik) for CCD protection was used. Video evaluation accomplished only visual with VirtualDub 1.10.0 and Fitswork 4.44 Due to moving clouds a camera integration time of 320ms (=8 frames) had to be used. But few seconds before the occultation all the star signals were much more dimished. So I had to use additional software image stacking later to evaluate the event times. Because of the use of a WAT-120N CCIR in integration mode Frame8 (It=320ms), and an additional software stacking up to 16 frames or 0.64s later, a correction of -350ms was performed at the times inserted in the video by the VTI. The correction value is according to measurements results with EXposure Time Analyzer - EXTA. http://www.dangl.at/exta/exta_e.htm So all event times in this report are corrected times representing the real event times. Event data details according to the predictions from IOTA (Steve Preston). Predicted event time was 21:00:14 UTC (+/- 4s) for my observing position. Predicted maximum duration was 8.5 seconds with a 1.5mag drop. Position was -78km from predicted central line in NE direction between central line and path edge with a probability of 65.0%. Occultation event detected with duration 8.321s +/-0.66s (It=0.64s). 3-D Position and timing Garmin GPS18x LVC Receiving 08 satellites Horizontal Dilution of Precision 0.9 Geoidal separation 44.5m (Altitude 553.6MSL + 44.5 = 598.1 m in WGS84 datum) Gerhard Dangl gerhard@dangl.at www.dangl.at/ +--------------------------------------------------------------------+