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OCCULTATION OF UCAC4 595-036941 BY 432 Pythia
2015 January 16


A Two Positive chords were recorded using video OSD technique.

No clearly observed misses were recorded for this event.

View the TT14 prediction.

Observers:
  1    D Herald,Murrumbateman, NSW, AU      
  2    J Newman,Flynn, ACT, AU              
  3(P) Prediction TT14, 30 Dec 2014         
        

Pythia  occultation__ 2015 January 16

Discussion:

The circle above is plotted at the expected 46 km diameter of Pythia . With 2 chords we can be confident of the path of Pythia and that it was north of the predicted line. John Newman's recording had a problem with his GPS time insertion. So Only the duration could be measured by using a frame count. The absolute UTC time has bee estimated by aligning his short chord to fit the circle with Dave Herald's longer chord. Lightcurve data suggests that an ellipse with maximum axis ratio of about 1.15:1 might be a better fit but we have no information about the major axis angle and there is no DAMIT or ISAM model to give a clue of projected shape.

The figure below shows the Tangra light curve of Dave's occultation as analysed by Aota.

Pythia  occultation__ 2015 January 16

The figure below shows the Tangra light curve of John's occultation as analysed by Aota.

Pythia  occultation__ 2015 January 16

Observational Data:


Observation details for MP ( 432 ) Pythia
By Star              UCAC4 595-036941
On 2015-01-16  at 13:43:30.0

_______________________________

Observer   Dave Herald
Location   Murrumbateman, NSW, AU
Longitude  +148:59
Latitude   -34:57
Altitude   594 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   40 cm
Seeing     Slight flickering Clear 
Camera Type  WAT910BD       PAL/CCIR      
Camera Delay -0.04
Timing     GPS - time inserted Video with frame analysis
Disappearance  13:43:41.92
Reappearance   13:43:44.70
Comments:  Lightcurve from 13:42:25 to 13:44:24 by Tangra v3.3.2 
using AperturePhotometry/AverageBackground. 
Analysis by AOTA v4.1.4.1. 
Report prepopulated by IOTA Reporting Add-in for OW ver.1.8

_______________________________

Observer   John Newman
Location   Flynn, ACT, AU
Longitude  +149:02
Latitude   -35:11
Altitude   657 m
Datum      WGS84
Telescope other - specify below
Aperture   41 cm
Seeing     Slight flickering Clear other - list in comments
Camera Type  WAT120N+       NTSC/EIA      
Camera Delay -0.159
Timing     GPS - time inserted Video with frame analysis
Disappearance  00:00:13.43:12.33
Reappearance   00:00:13.41:12.80
Comments: A positive event sans Absolute Time Base.
Times adjusted to match Dave Herald's when Pythia is plotted as circle
Report prepopulated by IOTA Reporting Add-in for OW ver.1.8
Analysis by AOTA v4.1.4.1. 

        

Return to 2015 occultation results



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