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OCCULTATION OF UCAC4 441-046472 BY 683 Lanzia
2017 January 25


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                           

 

       

Lanzia occultation__ 2017 January 25

Discussion:

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.

Lanzia  occultation__ 2017 January 25

The figure below shows the Tangra light curve of the occultation as observed by Jonathan Bradshaw.

Lanzia  occultation__ 2017 January 25

Observational Data:

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:     


        

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