ASTEROIDAL OCCULTATION - REPORT FORM +------------------------------+ +-------------------------------+ | EAON | | IOTA/ES | | | | INTERNATIONAL OCCULTATION | | EUROPEAN ASTEROIDAL | | TIMING ASSOCIATION | | OCCULTATION NETWORK | | EUROPEAN SECTION | +------------------------------+ +-------------------------------+ 1 DATE: 2022 Dec 25, 21:09 (UTC) STAR: UCAC4 544-023481 mv: 14.2 mag ASTEROID: (418) Alemannia mv: 13.0 mag (diam. 40.0 km) combined magnitude: mv: 12.7 mag delta-magnitude: mv: 0.3 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 8.8 km from C.L.) Probability: 82.9 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 21 09 14.562 +/- 0.001 s : Start observation (UTC) D 21 09 42.930 +/- 0.080 s : Disappearance (UTC) R 21 09 45.300 +/- 0.300 s : Reappearance (UTC) E 21 10 14.555 +/- 0.001 s : End observation (UTC) Duration: 2.370 +/- 0.380 s : (predicted: max. 3.5 s) M 21 09 44.115 +/- 0.190 s : Mid-event (UTC) P 21 09 44.314 +/- 2.202 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 3 m Camera/Sensor: Digital Camera with integrated GPS-VTI (DVTI+CAM, serial #13) Image Sensor Sony IMX430LLJ-C (1.1" 1624x1240 4.5um CIS) Website of the project: https://groups.io/g/d-vti-cam/ Settings: 812x620, Exposure time 100 ms, Gain +25 dB D, Binning 2x2, Format ADV 16-bit without Dark Frame but correction algorithm "Fixed pattern noise red." applied Time insertion: Digital GNSS timestamp into image sensor data stream 7 OBSERVING CONDITIONS: Atmospheric transp.: fair, instable due to upcoming fog Moon: below horizon Wind: no Star image stability: fair Altitude of star: 50 deg Azimut of star: 124 deg in Orion 8 ADDITIONAL COMMENTS: Feed: IBEROC Events Video recording software: DVTI Cam Control v5.5.1-4 Light measurement tool: PyMovie v3.6.6, PyOTE v4.9.2, AOTA v4.2022.12.24 Remarks: Published by e-mail to planoccult@ls.vvs.be (Planoccult mailing list)