ASTEROIDAL OCCULTATION - REPORT FORM +------------------------------+ +-------------------------------+ | EAON | | IOTA/ES | | | | INTERNATIONAL OCCULTATION | | EUROPEAN ASTEROIDAL | | TIMING ASSOCIATION | | OCCULTATION NETWORK | | EUROPEAN SECTION | +------------------------------+ +-------------------------------+ 1 DATE: 2020 Sep 11, 03:12 (UTC) STAR: UCAC4 550-025513 mv: 14.1 mag ASTEROID: (168) Sibylla mv: 14.2 mag (diam. 146.0 km) combined magnitude: mv: 13.4 mag delta-magnitude: mv: 0.8 mag 2 OBSERVER: Name: Stefan Meister E-mail: meister@dolphins.ch Address: Sandgruebstr. 9, CH-8193 Eglisau, Switzerland 3 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 19.9 km from C.L.) Probability: 63.4 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 03 12 11.888 +/- 0.200 s : Start observation (UTC) D 03 12 24.782 +/- 0.480 s : Disappearance (UTC) R 03 12 31.441 +/- 0.230 s : Reappearance (UTC) E 03 12 46.997 +/- 0.200 s : End observation (UTC) Duration: 6.659 +/- 0.710 s : (predicted: max. 6.1 s) M 03 12 28.112 +/- 0.355 s : Mid-event (UTC) P 03 12 28.188 +/- 3.278 s : Predicted time (UTC) 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 3m (after GPS fix received) Camera/Sensor: Digital Camera with integrated GPS-VTI (XXXXXXXX, serial #0) IMX174LLJ, Pixel size 5.86my, QE ~77% @ 530nm Website of the project: https://groups.io/g/d-vti-cam/ Settings: 960x600, Exposure time 100 ms, Gain +24 dB, Binning 2x2, Digital Video format ADV, 16 Bit, no Dark Frame substracted no ROIs, correction algorithm "Fixed pattern noise reduction" applied Time insertion: Digital GNSS timestamp into image sensor data stream GPS fix received about 2-3 mins. after event, since preparation time was too short Time adjusted backward from recorded NTP time as per attached correction table 7 OBSERVING CONDITIONS: Atmospheric transp.: good Moon: 43 percent lit, distance 8 deg Wind: no Star image stability: fair Altitude of star: 42 deg Azimut of star: 108 deg in Orion 8 ADDITIONAL COMMENTS: Feed: IBEROC Events Video recording software: DVTI Cam Control v4.10.2 Light measurement tool: Tangra v3.7.3 and AOTA Remarks: see comment above under "Time insertion" Published by e-mail to planoccult@ls.vvs.be (Planoccult mailing list)