ASTEROIDAL OCCULTATION - REPORT FORM +------------------------------+ +-------------------------------+ | EAON | | IOTA/ES | | | | INTERNATIONAL OCCULTATION | | EUROPEAN ASTEROIDAL | | TIMING ASSOCIATION | | OCCULTATION NETWORK | | EUROPEAN SECTION | +------------------------------+ +-------------------------------+ 1 DATE: 2020 Mar 22, 21:23 (UTC) STAR: UCAC4 570-011044 mv: 13.7 mag ASTEROID: (332) Siri mv: 15.4 mag (diam. 40.4 km) delta-magnitude: mv: 1.9 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: N 47 31 10.4 (WGS84) Longitude: E 08 34 14.3 (WGS84) Altitude: 550 m (MSL) (WGS84) Predicted observation: yes (located OUTSIDE of predicted shadow path, 41 km N to C.L.) Probability: 26% Single station: Stefan MEISTER +----------------------------------+ 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 23 00.847 +/- 0.1 s : Start observation (UTC) D 21 23 20.154 +/- 0.2 s : Disappearance (UTC) R 21 23 21.604 +/- 0.2 s : Reappearance (UTC) E 21 24 00.595 +/- 0.1 s : End observation (UTC) Duration: 1.450 +/- 0.13s : (predicted: max. 1.4s) M 21 23 20.879 +/- 0.13s : Mid-event (UTC) P 21 23 30 +/- 2.00s : Predicted time (UTC) 5 TELESCOPE: Type: Ritchey-Chrétien Reflector (Officina Stellare Pro RC 360) Aperture: 360 mm, f/8, 20% obstruction Focal length: 2880 mm, with reducer actually only 1700 mm Magnification: focal (resulting field of view: 13.5' in x-axis) xxxxx Mount: equatorial (10micron GM4000 QCI) Motor drive: yes, also guided with PHD2 on TEC 140 6 TIMING & RECORDING: Time source: GPS Quality of signal: Accurancy 2m Camera/Sensor: Digital Camera with integrated GPS-VTI (Prototype v2b, #8) IMX174LLJ, Pixel size 5.86my, QE ~77% @ 530nm Website of the project: https://groups.io/g/d-vti-cam/ Settings: 960x600, 2x Binning, Exposure time 250ms (4 fps), Gain +25dB, Format ADV 16 Bit no Dark Frame substracted, correction algorithm "Fixed pattern noise reduction" applied Time insertion: Reconstructed GPS timestamp based on NTP synced PC timestamp and time diff. to GPS, after full GPS fix received (unfortunately the anntenna cable was plugged in too late) 7 OBSERVING CONDITIONS: Atmospheric transp.: good Moon: below horizont (2% @ 83° distance) Wind: yes, quite strong Star image stability: fair Altitude of star: 23° Azimut of star: 281° in Taurus 8 ADDITIONAL COMMENTS: Feed: UKOCL Video recording software: DvtiCamControl v4.8.6 Light measurement tool: Tangra v3.6.23 Remarks: Observation together with Andreas Schweizer at the same location but with two different telescopes/cameras (see also seperate report from Andreas) Published by e-mail to planoccult@ls.vvs.be (Planoccult mailing list)