ASTEROIDAL OCCULTATION - REPORT FORM +------------------------------+ +-------------------------------+ | EAON | | IOTA/ES | | | | INTERNATIONAL OCCULTATION | | EUROPEAN ASTEROIDAL | | TIMING ASSOCIATION | | OCCULTATION NETWORK | | EUROPEAN SECTION | +------------------------------+ +-------------------------------+ 1 DATE: 2022 Jul 21, 20:49 (UTC) STAR: TYC 5166-00602-1 mv: 11.6 mag ASTEROID: (409) Aspasia mv: 11.0 mag (diam. 176.0 km) combined magnitude: mv: 10.5 mag delta-magnitude: mv: 0.5 mag 2 OBSERVER: Name: Peter Englmaier E-mail: peter@englmaier.ch Address: Furttalstrasse 97, 8046 Zurich, Switzerland 3 OBSERVING STATION: Nearest city: Zurich Station: Private Observatory Latitude: N47 25' 21.144" (WGS84) Longitude: E08 29' 42.932" (WGS84) Altitude: 467 m (MSL) (WGS84) Predicted observation: yes (Distance 71.6 km from C.L.) Probability: 95.2 percent Single station: yes +----------------------------------+ 4 TIMING OF EVENT: | | | OCCULTATION RECORDED: POSTIIVE | | | +----------------------------------+ 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 20 48 35.086 +/- 0.001 s : Start observation (UTC) D 20 49 19.108 +/- 0.400 s : Disappearance (UTC) R 20 49 28.213 +/- 0.400 s : Reappearance (UTC) E 20 50 05.831 +/- 0.001 s : End observation (UTC) Duration: 9.1050 +/- 0.4615 s : (predicted: max. 17.0 s) P 20 49 20.457 +/- 2.949 s : Predicted time (UTC) D time: [20:49:19.1080] D: 0.6800 containment intervals: {+/- 0.0428} seconds D: 0.9500 containment intervals: {+/- 0.1488} seconds D: 0.9973 containment intervals: {+/- 0.4000} seconds R time: [20:49:28.2130] R: 0.6800 containment intervals: {+/- 0.0428} seconds R: 0.9500 containment intervals: {+/- 0.1488} seconds R: 0.9973 containment intervals: {+/- 0.4000} seconds Duration (R - D): 9.1050 seconds Duration: 0.6800 containment intervals: {+/- 0.0688} seconds Duration: 0.9500 containment intervals: {+/- 0.2020} seconds Duration: 0.9973 containment intervals: {+/- 0.4615} seconds 5 TELESCOPE: Type: RC Aperture: 405 mm Focal length: 3240 mm Magnification: f/8 Mount: 10 Micron GM 3000 HPS 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 Prototype V3, serial #25) Image Sensor Sony IMX174LLJ-C (1/1.2" 1920x1200 5.86um CIS) Website of the project: https://groups.io/g/d-vti-cam/ Settings: 480x300, Exposure time 100 ms, Gain +24 dB, Binning 4x4, Format ADV 16-bit, dark substracted Time insertion: Digital GNSS timestamp into image sensor data stream 7 OBSERVING CONDITIONS: Atmospheric transp.: fair Moon: below horizon Wind: no wind Star image stability: unstable (possibly due to short cool down of dome & scope) Altitude of star: 26 deg Azimut of star: 127 deg in Aquila 8 ADDITIONAL COMMENTS: Feed: IOTA Updates Video recording software: DVTI Cam Control v5.0.1-0 Light measurement tool: pymovie 3.4.4 & pyote 4.8.4 Remarks: magDrop: 0.440 +/- 0.033 (0.95 ci) snr: 2.34 no other event (satellite, etc.) visible Published by e-mail to planoccult@ls.vvs.be (Planoccult mailing list)