ASTEROIDAL OCCULTATION - REPORT FORM +------------------------------+ +-------------------------------+ | EAON | | IOTA/ES | | | | INTERNATIONAL OCCULTATION | | EUROPEAN ASTEROIDAL | | TIMING ASSOCIATION | | OCCULTATION NETWORK | | EUROPEAN SECTION | +------------------------------+ +-------------------------------+ 1 DATE: 2021 Feb 21, 19:30 (UTC) STAR: UCAC4 487-022645 mv: 13.9 mag ASTEROID: (130) Elektra mv: 12.2 mag (diam. 180.0 km) combined magnitude: mv: 12.0 mag delta-magnitude: mv: 0.2 mag 2 OBSERVING STATION: Nearest city: Buelach, Switzerland Station: Observatory Buelach (MPC Observatory Code: 167) http://www.sternwartebuelach.ch/ Latitude: N47 31' 10.402" (WGS84) Longitude: E08 34' 14.300" (WGS84) Altitude: 550 m (MSL) (WGS84) Single station: yes Predicted observation: yes (Distance 75.7 km from C.L.) Probability: 60.0 percent +----------------------------------+ 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) Acc. Comments Code HH MM SS.sss S.sss S 19 29 38.388 +/- 0.001 s : Start observation (UTC) D 19 30 17.493 +/- * s : Disappearance (UTC) R 19 30 24.553 +/- * s : Reappearance (UTC) E 19 31 08.665 +/- 0.001 s : End observation (UTC) Duration: 7.060 +/- * s : (predicted: max. 15.7 s) M 19 30 21.023 +/- * s : Mid-event (UTC) P 19 30 23.285 +/- 4.863 s : Predicted time (UTC) * Accurancy with confidence intervals from PyOTE: nominal magDrop: 0.40 snr: 1.77 D time: [19:30:17.4930] D: 0.6800 confidence intervals: {+/- 0.0555} seconds D: 0.9500 confidence intervals: {+/- 0.3287} seconds D: 0.9973 confidence intervals: {+/- 0.9586} seconds R time: [19:30:24.5530] R: 0.6800 confidence intervals: {+/- 0.0555} seconds R: 0.9500 confidence intervals: {+/- 0.3287} seconds R: 0.9973 confidence intervals: {+/- 0.9586} seconds Duration (R - D): 7.0600 seconds Duration: 0.6800 confidence intervals: {+/- 0.1142} seconds Duration: 0.9500 confidence intervals: {+/- 0.4792} seconds Duration: 0.9973 confidence intervals: {+/- 1.1281} seconds 5 TELESCOPE: Type: Newton Reflector f/5 Aperture: 500 mm Focal length: 2500 mm Magnification: focal (resulting field of view: 15.5' in x-axis) Mount: equatorial Motor drive: yes 6 TIMING & RECORDING: Time source: GPS Quality of signal: Accuracy 2m Camera/Sensor: Digital Camera with integrated GPS-VTI (DVTI CAM Prototype V3, serial #13) Image Sensor Sony IMX174LLJ-C (1/1.2" 1920x1200 5.86um CIS) Website of the project: https://groups.io/g/d-vti-cam/ Settings: 640x400, Exposure time 50 ms, Gain +18 dB, Binning 3x3, Format ADV 16-bit no Dark Frame and no ROIs, but correction algorithm "Fixed pattern noise red." Time insertion: Digital GNSS timestamp into image sensor data stream 7 OBSERVING CONDITIONS: Atmospheric transp.: fair Moon: 69 percent lit, distance 20 deg Wind: no Star image stability: good Altitude of star: 50 deg Azimut of star: 173 deg in Monoceros 8 ADDITIONAL COMMENTS: Feed: IBEROC Video recording software: DVTI Cam Control v4.11.1 Light measurement tool: PyMovie v2.9.3 and PyOTE v3.7.4 Remarks: Published by e-mail to planoccult@ls.vvs.be (Planoccult mailing list)