ASTEROIDAL OCCULTATION - REPORT FORM +--------------------------------+ +----------------------------------------+ | EAON | | IOTA/ES | | | | INTERNATIONAL OCCULTATION | | EUROPEAN ASTEROIDAL | | TIMING ASSOCIATION | | OCCULTATION NETWORK | | EUROPEAN SECTION | +--------------------------------+ +----------------------------------------+ 1 DATE: 27 January 2021 STAR: GDR2 3389850943219784320 ASTEROID: Sara No: 533 2 OBSERVER : Name : Anna Marciniak Abrr: Address : Astronomical Observatory Institute, A. Mickiewicz University, Sloneczna 36, Poznan, Poland 3 OBSERVING STATION: Nearest city : Poznan Station : Borowiec IAU obs code: 187 Latitude : 52 16 36.8 N Longitude : 17 04 30.8 E Altitude : 123 MSL Datum (WGS84 preferred): WGS84 Single, OR Double or Multiple station (Specify observer's name): single 4 TIMING OF EVENTS: +----------------------------------------------+ | OCCULTATION RECORDED: NEGATIVE | +----------------------------------------------+ Type of event: "S"tart observation "I"nterrupt-start "D"isappearance "B"link "F"lash "E"nd observation "J"nterrupt-end "R"eappearance "O"ther (specify) Event Time (UT) P.E. Acc. Code HH MM SS.ss S.ss S.ss S - 19:00:00.0 - - 1.0 D - - - - - R - - - - - E - 19:05:00.0 - - 1.0 Was your reaction time applied to the above timings? - not relevant, CCD imaging. 5 TELESCOPE: Type : Newton f/4.5 Aperture : 400 mm Focal length: 1800 mm FOV : 12.0'x 8.0' Mount : paralactic Motor drive: yes 6 TIMING & RECORDING: Time source : ntp server vega.cbk.poznan.pl Sensor : SBIG ST7 CCD camera with KODAK KAF400 sensor Mode of recording: Resolution: Medium, Image size: Quarter Shutter (SENS-UP): Mechanical Recording : Personal Computer Recording : CCDOps software Time insertion : none 7 OBSERVING CONDITIONS: Atmospheric transparency : variable, clouds passing during the event Wind (km/h) : 10 Temperature (deg C / humid.) : -2 deg C / humidity 99 % Star image stability : good Minor planet visible : yes Local conditions (degree) : star height: 51, Sun height: -32, Local moon conditions (degree) : Moon height: 43, Moon distance: 35 8 ADDITIONAL COMMENTS: Star magnitude : 13.9 Minor planet magnitude : 14.7 Feed : UKOCL from 2020-12-25 Distance (km) : 21 km, just outside the shadow Faintest star on CCD (mag) : 14.7 Exposure time : 0.5 s Readout time : 1.16 s Predicted max. duration (secs) : 5.3 Predicted max. drop (mag) : 1.2 Predicted mid-event (UT) : 19:02:50 Predicted error in time (secs) : 11 Probability : 18 % Clouds moving in the FOV during the event, but the lowest drop in the lightcurve is 0.6 mag vs expected 1.2 mag.