+--------------------------------+ +--------------------------------+ ASTERIODAL OCCULTATION - REPORT FORM +--------------------------------+ +--------------------------------+ EAON & IOTA-ES EUROPEAN ASTEROIDAL OCCULTATION NETWORK INTERNATIONAL OCCULTATION TIMING ASSOCIATION EUROPEAN SECTION +--------------------------------+ +--------------------------------+ 1.DATE: 2020/03/28 STAR: UCAC4-525-016205 ASTEROID: (97) Klotho 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: 594m (WGS84) 550m (MSL) 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: 19:58:28 D: 19:59:13.179 (+/-0.04s) R: 19:59:15.699 (+/-0.04s) Duration 2.520 (+/-0.08s) Mid time 19:59:14.439 (+/-0.08s) E: 20:01:21 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=80ms (12.5 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: good Wind: no Star image stability: fair Minor planet visible: separated until few minutes before occultation Temperature: 280 Kelvin (+07 deg Celsius) 8.ADDITIONAL COMMENTS: Target star UCAC4-525-016205, +11.9mag, 35deg Elevation. Asteroid (97) Klotho, +12.1mag. Star and Asteroid combined +11.2mag. Only Clear glass filter (Astronomik) for CCD protection was used. Video evaluation accomplished with VirtualDub 1.10.0 and Tangra 3.6.23 Because of the use of a WAT-910BD System TACOS, CCIR in Mode 4x (It=80ms), a correction of -60ms was performed at the times inserted in the video by the VTI. http://www.dangl.at/ausruest/vid_tim/vid_tim1.htm#wat910hxccir 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 in UTC. Event data details according to the predictions from Occult Watcher Feed IOTA (Steve Preston). Predicted event time was 19:59:16 UTC (+/- 1s) for my observing position. Predicted maximum duration was 3.3 seconds with a 0.9mag drop. Position was -2.6km from predicted central line in NE direction between central line and path edge with a probability of 100%. Occultation event detected with duration 2.52s +/-0.08s (It=80ms). 3-D Position and timing Garmin GPS18x LVC (Update of Almanac data before recording start) Receiving 07 satellites Horizontal Dilution of Precision 1.1 Geoidal separation 44.5m (Altitude 549.9MSL + 44.5 = 594.4 m in WGS84 datum) Gerhard Dangl gerhard@dangl.at www.dangl.at/ +--------------------------------------------------------------------+