ASTEROIDAL OCCULTATION - REPORT FORM +------------------------------+ +------------------------------+ | EAON | | IOTA/ES | | | | INTERNATIONAL OCCULTATION | | EUROPEAN ASTEROIDAL | | TIMING ASSOCIATION | | OCCULTATION NETWORK | | EUROPEAN SECTION | +------------------------------+ +------------------------------+ 1 DATE: 2018 October 05 STAR: UCAC4 477-28075 ASTEROID: (25) Phocaea 2 OBSERVER: Name: Gérard VAUDESCAL Abbr:VDC E-mail: gg.vaudescal@free.fr Address: 65380 Azereix - France Name: Dinastro Team Abbr: E-mail: Address: ASS. DINASTRO chemin de biscarmiau 65200 Visker - France 3 OBSERVING STATION: Nearest city: VISKER(65200) Station: Observatoire de Biscarmiau Latitude: N 43 08 40.4 (WGS84) Longitude: E 00 03 31.8 (WGS84) Altitude: 488 m Single, OR Double or Multiple station (Specify observer's name): Single +----------------------------------+ 4 TIMING OF EVENTS: | | | OCCULTATION RECORDED: UNCERTAIN | | | +----------------------------------+ Type of event Start observation Interrupt-start Disappearance Blink Flash End observation Jnterrupt-end Reappearance Other (specify) Comments Event Time (UT) Acc. Code HH MM SS.ss S.ss S - 01:42:58:50 on frame n°8 D - 01:43:42.18 +/-0.16 n°145 (correction Gerhard Dangl) R - 01:43:48.43 +/-1.12 n°166 (correction Gerhard Dangl) E - 01:44:35.14 on frame n°310 Duration : 6.25sec +/-1.28 Mid-event : 01h43mn45.30sec (Forecast 01h43mn45s) Was your reaction time applied to the above timings? NO 5 TELESCOPE: Type: NEWTON Aperture:1188/305 mm (F/D= 3.9) Magnification: Optical focus Mount: Equatorial Motor drive: YES 6 TIMING & RECORDING: Time source: GPS 1PPS Sensor: CAMERA WATEC 910HX/RC CCIR - integrated Shutter Low x16 (0,32sec/f) - Gamma 1 - Gain 35dB Recording: OccuRec V 3.2.0 Beta and Grabber Lindy USB2 - mode AAV - Intégration rate x8 Time insertion (specify):IOTA VTI V3 (CCIR) Event insertion (specify): PC-Windows7 7 OBSERVING CONDITIONS: CLEAR SKY Wind: 1 to 2 ms (variable wind) Temperature: 15 °C Star image stability: seeing > 1.5 arcsec Minor planet visible: Yes 8 ADDITIONAL COMMENTS: Reduction under TANGRA 3.6.17 - intégration of G. Dangl corrections. Finalization of the reduction by AOTA - (Control of Eric Frappa). Uncertainty on the result following the small magnitude drop (0.25 mag) compared to the fluctuation of the signal. Duration of the occultation greater than the forecast?