ASTEROIDAL OCCULTATION - REPORT FORM +------------------------------+ +------------------------------+ | EAON | | IOTA/ES | | | | INTERNATIONAL OCCULTATION | | EUROPEAN ASTEROIDAL | | TIMING ASSOCIATION | | OCCULTATION NETWORK | | EUROPEAN SECTION | +------------------------------+ +------------------------------+ 1 DATE: 2021/09/03 STAR: HIP 100805 ASTEROID: (11950) Morellet 2 OBSERVER: Name: Daniel BLAZEWICZ Address: 32-015 Klaj, POLAND 3 OBSERVING STATION: Klaj Nearest city: Niepolomice (Poland) Longitude: E 20 19 04.2 (WGS84) Latitude: N 49 59 33.2 (WGS84) Altitude: 211 m (MSL) Single station +----------------------------+ 4 TIMING OF EVENTS: | | | EVENT REPORTED: NEGATIVE | | | +----------------------------+ Event code S: observation Start I: Interruption start D: Disappearance J: Interruption end R: Reappearance B: Blink F: Flash E: observation End O: Other (specify) Abbreviations P.E.: Personal Equation = reaction time (for visual obs) Acc.: Accuracy (overall accuracy of the given time) Comments Event Time (UT) P.E. Acc. Code HH:MM:SS.ss S.ss S.ss S - 20:20:59 - - : E - 20:26:59 - - : 5 TELESCOPE: Type: NEWTON Aperture: 350 mm Magnification: prime focus f/4.8 Mount: EQUATORIAL with polar wedge Motor drive: YES 6 TIMING & RECORDING: Time source: NTP Stratum 1, Linux Ubuntu Sensor: ZWO ASI174MM-C Recording: ZWO ASICAP V2.3 Exposure: 0.006 s, but due to stability problems with recording we can firmly say that the potential occultation was shorter than 3 frames: 0.018 s 7 OBSERVING CONDITIONS: Atmospheric transparency: fair Wind: no Temperature: 14 deg C Star image stability: fair Minor planet visible: no 8 ADDITIONAL COMMENTS: Analyzed using PyMovie 3.1.4 and a spreadsheet. Faintest star on recording: 10.2 m IBEROC feed (2021/08/26): Event time: 20:22:40 UT Error in time: 6 s Max duration: 1.2 s Star magnitude: 7.4 m Asteroid magnitude: 19.2 m Combined magnitude: 7.4 m Magnitude drop: 11.8 m Position: 91 km outside the 1-sigma zone Probability: 0.9 %