ASTEROIDAL OCCULTATION - REPORT FORM +------------------------------+ +-------------------------------+ | EAON | | IOTA/ES | | | | INTERNATIONAL OCCULTATION | | EUROPEAN ASTEROIDAL | | TIMING ASSOCIATION | | OCCULTATION NETWORK | | EUROPEAN SECTION | +------------------------------+ +-------------------------------+ 1 DATE: 2021 February 21 19:30:22 (UTC) STAR: UCAC4 487-022645 mv: 13.9 mag ASTEROID: (130) Elektra mv: 12.2 mag (diam. 180.7 km) combined magnitude: mv: 12.0 mag delta-magnitude: mv: 0.2 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 (MPC Observatory Code: B77) http://www.sternwarte-schafmatt.ch Latitude: N 47° 25' 12.88" (WGS84) Longitude: E 07° 57' 02.95" (WGS84) Altitude: 820 m (MSL) (WGS84) Predicted observation: yes (located 28 km East of the predicted center line) With of path: 180 km Probability: 84.8 % 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 19 28 00 +/-0.02 s : Start observation (UTC) D 19 30 13.84 +/-0.15 s : Disappearance (UTC) R 19 30 26.85 +/-0.06 s : Reappearance (UTC) E 19 32 40 +/-0.02 s : End observation (UTC) Duration: 13.01 s +/-0.16 s : (predicted: max. 15.7 s) M 19 30 20.35 +/-0.08 s : Mid-event (UTC) P 19 30 22 +/-5.00 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: 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: 2.8 m/s SE Temperature: +9 °C Relative humidity: 64 % Atmospheric pressure: 1018 hPa Moonlight: yes (20° distant from star, 66° above horizon) Star image stability: good (occulted star 50° above horizon) Minor planet visible: yes (brightness 12.2 mag) 8 ADDITIONAL COMMENTS: Shutter mode: x2 (1/25s) Integration time (It) = 0.040 s Correction time (Ct) = -0.040 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 No evidence of any satellite was found in the range of -134/+133 seconds. 9 CREDITS: Many thanks to Eric Frappa for the analyze with AOTA software.