An 11 second occultation was recorded by Dave Herald, using an SCT Telescope and Watec 910BD camera.

An 11 second occultation was recorded by Ivan Curtis, using an SCT Telescope and CDD camera.

An occultation was recorded by Paul Montague, but the time of disappearance was not captured.

View the IOTA update.

Observers:
  1    D Herald, Murrumbateman, New South Wales, Australia     
  2    P Montague, Adelaide, South Australia, Australia          
  3    I Curtis, Adelaide, South Australia, Australia            
  4(P) Prediction                           

       

Discussion:

The circle above is plotted at the expected diameter of Polyxo. As the chords are so close together, it is not possible to tell if the observers were north or south of the centre line of the event. The model has been plotted centred on the observed chords.

The figures below show the Tangra light curve of the occultation.

Curtis:

Herald:

Observational Data:

Observation details for MP ( 308 ) Polyxo
By Star              TYC 0805-00397-1 
On 2018-01-08  at 12:42:56.0

_______________________________

Observer   Dave Herald
Location   Murrumbateman, NSW, Australia
Longitude  +148:59
Latitude   -34:57
Altitude   594 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   40 cm
Seeing     Strong flickering Thick cloud > 2 
Camera Type  Watec 910BD    PAL/CCIR      
Camera Delay 
Timing     GPS - time inserted Video with frame analysis
Disappearance  12:42:48.39
Reappearance   12:42:59.67
Comments: Through fairly thick cloud - 8 frame integration Lightcurve from 12:42:15 to 12:43:21 by
Tangra v3.6.15 using AperturePhotometry/AverageBackground. Analysis by AOTA v4.5.3.3.
Report prepopulated by IOTA Reporting Add-in for OW ver.1.9

_______________________________

Observer   Paul Montague
Location   Adelaide, SA, AU
Longitude  +138:42
Latitude   -34:46
Altitude   158 m
Datum      WGS84
Telescope other - specify below
Aperture   20 cm
Seeing     Strong flickering Clear 
Camera Type  Other - List in Comments     CCD Drift     
Camera Delay 
Timing     other Video, photo or photoelectric
Disappearance  00:00:00.00
Reappearance   12:43:58.59
Comments: Used a ZWO ASI1600MM-C camera at -20 Celsius with 20ms exposures and a ROI around the
target star of 800x606.
Had incorrect info for expected occultation time (4 mins early) and gave up recording just before
the star disappeared! Quickly restarted and captured the reappearance.
Start time is for that video. Report prepopulated by IOTA Reporting Add-in for OW ver.1.9

_______________________________

Observer   Ivan A. Curtis
Location   Adelaide, SA, AU
Longitude  +138:37
Latitude   -34:53
Altitude   44 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   24 cm
Seeing     Slight flickering Clear 
Camera Type  CCD            ADVS          
Camera Delay 
Timing     other Video with frame analysis
Disappearance  12:43:46.00
Reappearance   12:43:57.00
Comments: