ASTEROIDAL OCCULTATION - REPORT FORM +------------------------------+ +-------------------------------+ | EAON | | IOTA/ES | | | | INTERNATIONAL OCCULTATION | | EUROPEAN ASTEROIDAL | | TIMING ASSOCIATION | | OCCULTATION NETWORK | | EUROPEAN SECTION | +------------------------------+ +-------------------------------+ 1 DATE: 2020 Aug 09, 01:01 (UTC) STAR: UCAC4 348-000181 mv: 13.3 mag ASTEROID: (22) Kalliope and Linus mv: 11.1 mag (diam. 169 / 28 km) delta-magnitude: mv: 0.13 mag for Linus 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) Probability: ?% Single station: Stefan MEISTER +----------------------------------+ 4 TIMING OF EVENT: | | | OCCULTATION RECORDED: NEGATIVE | | | +----------------------------------+ 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 1st recording: S 01 00 16.395 +/- 0.001 s : Start observation (UTC) D - +/- - s : Disappearance (UTC) R - +/- - s : Reappearance (UTC) E 01 03 19.335 +/- 0.001 s : End observation (UTC) 2nd recording: S 01 03 22.836 +/- 0.001 s : Start observation (UTC) D - +/- - s : Disappearance (UTC) R - +/- - s : Reappearance (UTC) E 01 05 04.758 +/- 0.001 s : End observation (UTC) Duration: - +/- - s : (predicted: max. 3.8 s for Linus) P 01 01 25 +/- ? s : Predicted time (UTC) 5 TELESCOPE: Type: Newton Reflector f/5 Aperture: 500 mm, 4.4% obstruction 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: Accurancy 4-6m 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 100ms (10 fps), Gain +24dB, Digital Video format ADV, 16 Bit, no Dark Frame substracted, no ROIs, correction algorithm "Fixed pattern noise reduction" applied Time insertion: - within Camera, visual and digital GPS timestamp (highly accurate) - Backup with NTP synced PC timestamp (not accurate, just used for comparison purposes) 7 OBSERVING CONDITIONS: Atmospheric transp.: good Moon: yes, 74%, 28 deg distance Wind: no Star image stability: very good Altitude of star: 20° Azimut of star: 159° in Cetus 8 ADDITIONAL COMMENTS: Feed: LuckyStar Website Video recording software: DvtiCamControl v4.9.10 Light measurement tool: Tangra v3.7.3 Remarks: - Published by e-mail to planoccult@ls.vvs.be (Planoccult mailing list)