ASTEROIDAL OCCULTATION - REPORT FORM +------------------------------+ +-------------------------------+ | EAON | | IOTA/ES | | | | INTERNATIONAL OCCULTATION | | EUROPEAN ASTEROIDAL | | TIMING ASSOCIATION | | OCCULTATION NETWORK | | EUROPEAN SECTION | +------------------------------+ +-------------------------------+ 1 DATE: 2019 July 09 21:38:41 (UTC) STAR: UCAC4: 447-103445 mv: 12.9 mag ASTEROID: (5434) Tomwhitney mv: 17.4 mag (diam. 21.6 km) combined magnitude: mv: 12.9 mag delta-magnitude: mv: 4.5 mag 2 OBSERVER: Name: Jonas SCHENKER / Abbr: Schenker 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 observation: yes (located 3 km south of the predicted center line) Probability: 17.0 % Single station: Jonas SCHENKER +----------------------------------+ 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 21 38 03 +/-0.020 s : Start observation (UTC) D 21 38 51.018 +/-0.020 s : Disappearance (UTC) R 21 38 52.338 +/-0.020 s : Reappearance (UTC) E 21 39 37 +/-0.020 s : End observation (UTC) Duration: 1.320 s +/-0.020 s : (predicted: max. 1.9 s) M 21 38 51.678 +/-0.020 s : Mid-event (UTC) P 21 38 41 +/-4.000 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: Hauppauge Analog Video Digitizer USB-Live 2 Time insertion: Video Time Inserter IOTA-VTI v3 with GPS Video frame time (Vt) 7 OBSERVING CONDITIONS: Atmospheric transp.: good Wind: 3.0 m/s from N Temperature: +13 °C Relative humidity: 66 % Atmospheric pressure: 1016 hPa Moonlight: yes (about half moon, 86° distant of occulted star) Star image stability: good (occulted star 35° above horizon) Minor planet visible: no (brightness only 17.4 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 v3.6.18 No evidence of any satellite was found in the range of -48/+45 seconds. 9 CREDITS: Sepp Kaeser for helpful assistance (and for the cold beer after successful observation :-)