A 6.7 second occultation was recorded by Jonathan Bradshaw from Samford while John Broughton at Reedy Creek on the Gold Coast recorded a 6.4 second event. Both observations were recorded by video.
View a prediction here.
Observers: 1 J Bradshaw,Samford Valley, QLD, AU 2 J Broughton,Reedy Creek, QLD, AU 3(P) Prediction
A shape model is available for (683) Lanzia but even with adjustments to the rotation period to show different profiles, the fit to the two observed chords is relatively poor. It is relatively unusual for an event involving an asteroid of this size to produce similar length chords from locations this far apart. It would appear that the centreline is approximately halfway between the sites.
The figure below shows the Tangra light curve of the occultation as observed by John Broughton.
The figure below shows the Tangra light curve of the occultation as observed by Jonathan Bradshaw.
Observation details for MP ( 683 ) Lanzia By Star UCAC4 441-46472 On 2017-01-25 at 14:13:50.0 _______________________________ Observer Jonathan Bradshaw Location Samford Valley, Qld, Australia Longitude +152:50 Latitude -27:22 Altitude 80 m Datum WGS84 Telescope SCT including Cass and Mak Aperture 36 cm Seeing Steady Clear Camera Type Watec 910BD NTSC/EIA Camera Delay Timing GPS - time inserted Video with frame analysis Disappearance 14:14:06.76 Reappearance 14:14:12.17 Comments: 20s Late Report prepopulated by IOTA Reporting Add-in for OW ver.1.8 _______________________________ Observer John Broughton Location Reedy Creek, QLD, AU Longitude +153:23 Latitude -28:06 Altitude 66 m Datum WGS84 Telescope SCT including Cass and Mak Aperture 25 cm Seeing Slight flickering Broken cloud Camera Type Watec 120N+ PAL/CCIR Camera Delay Timing GPS - time inserted Video with frame analysis Disappearance 14:14:03.03 Reappearance 14:14:09.43 Comments: