Two Positive chords were recorded , using video OSD technique.

View the updated prediction.

Observers:
  1    J Milner,Glen Forrest, WA, AU
  2    S Kerr,Rockhampton,QLD,AU
  3(P) Prediction



        

Discussion:

The ellipse above is plotted at the best fit axis ratio as determined by Occult. This is close to the same area as a circle of the expected 82 km diameter of Thetis. With 2 chords we can be confident of the path of Thetis and that it was south of the predicted line.

The two ISAM 3D models have been overlaid on the measured ellipse and both show good fit making it difficult to determine which of the two 3D sdolutions is the better fit.

The figure below shows the Tangra light curve of Jacquie's occultation.

The figure below shows the Tangra light curve of Steve's occultation.

Observational Data:

Observation details for MP ( 17 ) Thetis
By Star              UCAC2 37660277
On 2013-08-23  at 19:04:10.0

_______________________________

Observer   Jacquie Milner
Location   Glen Forrest, WA, AU
Longitude  +116:05
Latitude   -31:54
Altitude   260 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   20 cm
Seeing     Slight flickering Clear
Camera Type  Mintron 12V1C-EX             PAL/CCIR
Camera Delay -0.08
Timing     GPS - time inserted Video with frame analysis
Disappearance  19:04:04.66
Reappearance   19:04:08.18
Comments: f3.3 focal reducer used. Only 18 degrees above the horizon for me.
My first positive result!  Great to see after a very frustrating run with the winter weather.

_______________________________

Observer   S. Kerr
Location   Rockhampton
Longitude  +150:30
Latitude   -23:16
Altitude   50 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   30 cm
Seeing     Slight flickering Clear
Camera Type  WAT120N+       PAL/CCIR
Camera Delay -0.11
Timing     GPS - time inserted Video with frame analysis
Disappearance  19:06:07.19
Reappearance   19:06:10.87
Comments:   Report prepopulated by IOTA Reporting Add-in for OW ver.1.7