ASTEROIDAL OCCULTATION - REPORT FORM +------------------------------+ +-------------------------------+ | EAON | | IOTA/ES | | | | INTERNATIONAL OCCULTATION | | EUROPEAN ASTEROIDAL | | TIMING ASSOCIATION | | OCCULTATION NETWORK | | EUROPEAN SECTION | +------------------------------+ +-------------------------------+ 1 DATE: 2020 September 13 23:25:49 (UTC) STAR: UCAC4 645-013859 mv: 12.3 mag ASTEROID: (116040) 2003 WQ100 mv: 19.0 mag (diam. 10.0 km) combined magnitude: mv: 12.3 mag delta-magnitude: mv: 6.7 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 occultation: yes (located 5 km East of the predicted center line) Width of path: 13 km Probability: 3.8 % Single station: Joseph KAESER +----------------------------------+ 4 TIMING OF EVENT: | | | OCCULTATION RECORDED: NEGATIVE | | | +----------------------------------+ 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 23 30 +/-0.020 s : Start observation (UTC) D -- -- --.--- +/-0.020 s : Disappearance (UTC) R -- -- --.--- +/-0.020 s : Reappearance (UTC) E 23 27 59 +/-0.020 s : End observation (UTC) Duration: -.--- s +/-0.020 s : (predicted: max. 1.6 s) M -- -- --.--- +/-0.020 s : Mid-event (UTC) P 23:25:49 +/-17.00 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.: good Wind: 0.0 m/s Temperature: +19 °C Relative humidity: 72 % Atmospheric pressure: 1024 hPa Moonlight: no (below horizon) Star image stability: good (occulted star 25° above horizon) Minor planet visible: no (brightness 19.0 mag) 8 ADDITIONAL COMMENTS: Shutter mode: 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 v3.6.17 No evidence of any satellite was found in the range of -139/+130 seconds. 9 CREDITS: Jonas Schenker for helpful assistance.