ASTEROIDAL OCCULTATION - REPORT FORM +------------------------------+ +------------------------------+ | EAON | | IOTA/ES | | | | INTERNATIONAL OCCULTATION | | EUROPEAN ASTEROIDAL | | TIMING ASSOCIATION | | OCCULTATION NETWORK | | EUROPEAN SECTION | +------------------------------+ +------------------------------+ 1 DATE (YYYY/MM/DD): 2021/11/25 STAR: UCAC4 550-016949 ASTEROID: 2001 KM55 N°: 72897 2 OBSERVER: Name: Peter DELINCAK EAON Abbr: PDL E-mail: pdlink@astronomy.sk Address: SLOVAKIA, Hviezdoslavova 1971, 022 01 Cadca Phone: +421 915 710 121 Web: www.astronomy.sk 3 OBSERVING STATION: Nearest city: Cadca Station: PDlink Observatory Longitude (DD MM SS.s): E 18 42 09.47 (WGS84) Latitude (DD MM SS.s): N 49 24 15.20 (WGS84) Altitude (m): 680.231m (WGS84) Single|Multiple station: Single +----------------------------+ 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) Personal Equation Substracted: No Comments Event Time (UT) P.E. Acc. Code HH:MM:SS.ss S.ss S.ss S - 01:11:00.000 0.333s : - - - : D - : R - : - - - : E - 01:13:00.000 0.333s : Duration : Mid-event : 5 TELESCOPE: Type: Mirror optics Aperture: 400mm Magnification: prime focus (f/5) Mount: EQUATORIAL Motor drive: YES 6 TIMING & RECORDING: Time source: GPS 1PPS Integral GPS Receiver Sensor: QHY 5 III 290 Recording: It=0.333s (3.0 Img/s), uncompressed AVI Recording device: W7 32b Computer HDD Time insertion (specify): Precision GPS Time Video Overlay Unit => GPS++ 7 OBSERVING CONDITIONS: Atmospheric transparency: GOOD Wind: NO Temperature: -4C Star image stability: AVERAGE Minor planet visible: NO 8 ADDITIONAL COMMENTS: Event data details according to the predictions from UKOCL. Predicted event time was 01:11:53 UTC (+/- 5s) for my observing position. Predicted maximum duration was 0.9 seconds with a 4.5 mag drop. Position was 6km from predicted central line in N direction inside the shadow with a probability of 9.4%. Analyzed by Tangra. Receiving 08 satellites Horizontal Dilution of Precision 1.2 Analyzed by Tangra. Synchronization of Windows system time was by TimeMemo software and during observation was recorded a special video record with both PC Windows system timestamps and timestamps produced from GPS 1PPS Integral GPS Receiver Blackbox (recorded by own software). Difference between real GPS time and system timestamps of disappearance/reappearance in recorded occultation video was aplied.