ASTEROIDAL OCCULTATION - REPORT FORM +------------------------------+ +-------------------------------+ | EAON | | IOTA/ES | | | | INTERNATIONAL OCCULTATION | | EUROPEAN ASTEROIDAL | | TIMING ASSOCIATION | | OCCULTATION NETWORK | | EUROPEAN SECTION | +------------------------------+ +-------------------------------+ 1 DATE: 2019 Jul 15, 22:01 (UTC) STAR: UCAC4 325-108230 mv: 14.5 mag ASTEROID: (177) Irma mv: 13.9 mag (diam. 69 km) delta-magnitude: mv: 0.5 mag 2 OBSERVER: Name: Stefan MEISTER and Andreas SCHWEIZER 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 INSIDE of predicted shadow path, 15 km N to C.L.) Single station: Stefan MEISTER and Andreas SCHWEIZER +----------------------------------+ 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 22 01 01.120 +/- 0.01 s : Start observation (UTC) D 22 01 13.740 +/- 0.63 s : Disappearance (UTC) R 22 01 20.490 +/- 1.62 s : Reappearance (UTC) E 22 01 51.604 +/- 0.01 s : End observation (UTC) Duration: 6.750 s : (predicted: max. 7.5s) M 22 01 17.115 +/- 1.12 s : Mid-event (UTC) P 22 01 17 +/- 5.00 s : Predicted time (UTC) 5 TELESCOPE: Type: Newton Reflector f/5 Aperture: 500 mm Focal length: 2500 mm Magnification: focal (resulting field of view: 6.6' in x-axis) Mount: equatorial Motor drive: yes 6 TIMING & RECORDING: Time source: GPS Quality of signal: Accurancy 2m Camera/Sensor: Digital Camera with integrated GPS-VTI (Prototype v1) AR0130CSSM, Pixel size 3.75my, QE 77% Website of the project: https://groups.io/g/d-vti-cam/ Settings: 640x480, 2x Binning, Exposure time 500ms (2 fps), Gain 10, Output format SER Dark Frame substracted Time insertion: within Camera, only digital and no visual timestamp due to incorrect dark substraction of the timestamp 7 OBSERVING CONDITIONS: Atmospheric transp.: fair Moon: yes, distance 20° Wind: no Star image stability: fair Altitude of star: 17 degrees, 190° Az 8 ADDITIONAL COMMENTS: Feed: Peter Delincak Video recording software: DvtiCamControl v4.3.2 (16 Bit) Light measurement tool: Tangra v3.6.18 and AOTA v4.6.11 Remarks: Revised on 21.7.19 after recalculations by Eric Frappa Published by e-mail to planoccult@ls.vvs.be (Planoccult mailing list)