ASTEROIDAL OCCULTATION - REPORT FORM +------------------------------+ +-------------------------------+ | EAON | | IOTA/ES | | | | INTERNATIONAL OCCULTATION | | EUROPEAN ASTEROIDAL | | TIMING ASSOCIATION | | OCCULTATION NETWORK | | EUROPEAN SECTION | +------------------------------+ +-------------------------------+ 1 DATE: 2019 August 25 00:59:42 (UTC) STAR: UCAC4: 370-183247 mv: 13.5 mag ASTEROID: (4006) Sandler mv: 16.2 mag (diam. 16.0 km) combined magnitude: mv: 13.4 mag delta-magnitude: mv: 2.8 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-East of the predicted center line) With of path: 23 km Probability: 25.0 % Single station: Jonas SCHENKER +----------------------------------+ 4 TIMING OF EVENT: | | | OCCULTATION RECORDED: NEGATIVE | | (MISSED) | +----------------------------------+ 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 57 32 +/-0.040 s : Start observation (UTC) D -- -- --.--- +/-0.040 s : Disappearance (UTC) R -- -- --.--- +/-0.040 s : Reappearance (UTC) E 01 02 04 +/-0.040 s : End observation (UTC) Duration: --.--- s +/-0.040 s : (predicted: max. 1.6 s) M -- -- --.--- +/-0.040 s : Mid-event (UTC) P 00 59 42 +/-3.000 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: 0.0 m/s from N Temperature: +17 °C Relative humidity: 81 % Atmospheric pressure: 1017 hPa Moonlight: yes (about quarter moon, 129° distant of occulted star) Star image stability: fair (occulted star 15° above horizon) Minor planet visible: no (brightness 16.2 mag) 8 ADDITIONAL COMMENTS: Shutter mode: x4 (integration x4) Integration time (It) = 0.080 s Correction time (Ct) = -0.060 s (evaluation in frames) Tolerance value = +/-0.040 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 -130/+142 seconds. 9 CREDITS: Sepp Kaeser for helpful assistance.