ASTEROIDAL OCCULTATION - REPORT FORM +------------------------------+ +-------------------------------+ | EAON | | IOTA/ES | | | | INTERNATIONAL OCCULTATION | | EUROPEAN ASTEROIDAL | | TIMING ASSOCIATION | | OCCULTATION NETWORK | | EUROPEAN SECTION | +------------------------------+ +-------------------------------+ 1 DATE: 2022 Mai 09 23:10:27 (UTC) STAR: UCAC4 505-056485 mv: 14.5 mag ASTEROID: (304) Olga mv: 14.0 mag (diam. 66.0 km) combined magnitude: mv: 13.5 mag delta-magnitude: mv: 0.53 mag 2 OBSERVER: Name: Jonas SCHENKER / Josef KAESER / Abbr: Kaeser J Observatory E-mail: jonas.schenker@sunrise.ch Address: Ruetiweg 6, CH-5036 Oberentfelden, Switzerland 3 OBSERVING STATION: Nearest city: 5000 Aarau, Switzerland Station: Sternwarte Schafmatt (IAU Observatory Code: B77) Latitude: N 47° 25' 12.88" (WGS84) Longitude: E 07° 57' 02.95" (WGS84) Altitude: 820 m (MSL) (WGS84) Predicted occultation: yes (located 9 km North-East of the predicted center line) With of path: 87 km Probability: 100 % Single station: Jonas SCHENKER / Josef KAESER +----------------------------------+ 4 TIMING OF EVENT: | | | OCCULTATION RECORDED: POSITIVE | | | +----------------------------------+ Type of event: S = Start observation I = Interrupt-start D = Disappearance B = Blink F = Flash E = End observation I = Interrupt-end R = Reappearance M = Mid-event P = Predicted time Event Time (UTC) Accuracy Comments Code HH MM SS.sss S.sss S 23 08 27 +/-0.04 s : Start observation (UTC) D 23 10 24.25 +/-0.04 s : Disappearance (UTC) R 23 10 28.54 +/-0.04 s : Reappearance (UTC) E 23 11 44 +/-0.04 s : End observation (UTC) Duration: 4.29 s +/-0.06 s : (predicted: max. 7.2 s) M 23 10 26.395 +/-0.04 s : Mid-event (UTC) P 23 10 27 +/-1.00 s : Predicted time (UTC) 5 TELESCOPE: Type: Cassegrain Astrograph (LOMO / P. Keller) Aperture: 450 mm Focal length: 1500 mm f/3.3 (primary focus) Magnification: focal (resulting field of view: 14.8' x 11.1') Mount: equatorial Motor drive: yes 6 TIMING & RECORDING: Time source: GPS unit: US Global Sat EM-406A (internal) Sensor: 1/2" Watec 910HX-RC (CCIR) (6.47 x 4.83 mm) 752 x 582 px (8.6 x 8.3 my) Frame grabber: LogiLink VG0005B USB2.0 Time insertion: Video Time Inserter IOTA-VTI v3 with GPS Video frame time (Vt) 7 OBSERVING CONDITIONS: Atmospheric transp.: good Wind: 0.0 m/s Temperature: +15 °C Relative humidity: 75 % Atmospheric pressure: 1022 hPa Moonlight: yes (Moon 59%, 27° above horizon, 46° distant to the occulted star) Star image stability: good (occulted star 50° above horizon) Minor planet visible: Yes (brightness 14.0 mag) 8 ADDITIONAL COMMENTS: Shutter mode: x4 Integration time (It) = 0.08 s Correction time (Ct) = -0.06 s (evaluation in frames) Tolerance value = +/-0.04 s (evaluation in frames) Video frame time = Vt Reported event time = Vt + Ct (correction time applied) Video editing software: VirtualDub v1.10.4 Light measurement tool: Tangra v3.7.3 No evidence of any satellite was found in the range of -119 / +78 seconds. 9 CREDITS: Many thanks to Josef Kaeser for the helpful assistance.