ASTEROIDAL OCCULTATION - REPORT FORM +------------------------------+ +-------------------------------+ | EAON | | IOTA/ES | | | | INTERNATIONAL OCCULTATION | | EUROPEAN ASTEROIDAL | | TIMING ASSOCIATION | | OCCULTATION NETWORK | | EUROPEAN SECTION | +------------------------------+ +-------------------------------+ 1 DATE: 2022 March 24 00:41:56 (UTC) STAR: UCAC4 604-031805 mv: 11.70 mag ASTEROID: (438) Zeuxo mv: 15.20 mag (diam. 61 km) combined magnitude: mv: 11.30 mag delta-magnitude: mv: 3.54 mag 2 OBSERVER: Name: Josef KAESER / Abbr: Kaeser J Observatory E-mail: j.kaeser@datacomm.ch Address: Muehlefeld 1, CH - 5015 Erlinsbach, 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 observation: yes (located 01 km South-west of the predicted center line) With of path: 108 km Probability: 99.8 % Feed: IOTA Single station: 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 00 39 39 : Start observation (UTC) D 00 41 53.81 +/- 0.02 s : Disappearance (UTC) R 00 41 57.75 +/- 0.04 s : Reappearance (UTC) E 00 44 11 : End observation (UTC) Duration: 3.94 s : (predicted: max. 4.15 s) M 00 41 55.78 s : Mid-event (UTC) P 00 41 56 +/- 2.00 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 11.8') 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.: fair Wind: 2.0 m/s NE Temperature: +8 °C Relative humidity: 49 % Atmospheric pressure: 1028 hPa Moonlight: no (Moon below horizon) Star image stability: bad (occulted star 14° above horizon) Minor planet visible: no (brightness 15.2 mag) 8 ADDITIONAL COMMENTS: Shutter mode: 1/50 s (integration x1) Integration time (It) = 0.020 s Correction time (Ct) = -0.020 s (evaluation in frames) Tolerance value = +/-0.020 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, AOTA (Eric Frappa) No evidence of any satellite was found in the range of -137/+135 seconds. 9 CREDITS: Many thanks to Jonas Schenker for the helpful support.