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OCCULTATION OF the HIP 112961 BY Venus
2014 April 16


Four Positive observations, Two with only one side were reported.

No clearly observed misses were recorded for this event.

View the updated prediction.

Observers:
  1    D Gault,Benalla, Victoria, AU        
  2    T Barry,Werrington Downs, NSW,AU     
  3    J Bradshaw,Samford Valley,Qld,AU     
  4    J Broughton,Reedy Creek, QLD, AU     
  5(P) Prediction,April 23                  

        

Venus occultation - 2014 April 16

Discussion:

The circle above is plotted at the 12239 km diameter of Venus.
With 2 full and 2 partial chords we can be confident of the path of Venus and that it was close of the predicted line.
Significant sources of error include:
Venus' atmosphere causing gradual extinction.
The D event being on the brightly lit side of Venus.
Even against the dark side the R is difficult to see (see Jonathan Bradshaw's image below).
The low altitude (14 Deg or less) of the observations causing local refraction and poor seeing.

So the circle has been plotted on the predicted path.

The figure below shows a Limovie frame and 3 D plot of Jonathan's R.

Venus occultation - 2014 April 16

Observational Data:

Observation details for MP ( 0 ) Venus
By Star              HIP HIP112961
On 2014-04-16  at 18:05:00.0

_______________________________

Observer   Dave Gault
Location   Benalla, Victoria, AU
Longitude  +146:01
Latitude   -36:32
Altitude   181 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   20 cm
Seeing     Strong flickering Clear
Camera Type  Flea3-03S3 with ADVS         ADVS
Camera Delay 0
Timing     GPS - time inserted Video with frame analysis
Disappearance  
Reappearance   18:05:02.80
Comments:     

_______________________________

Observer   Tony Barry
Location   Werrington Downs, NSW,AU
Longitude  +150:43
Latitude   -33:44
Altitude   162 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   25 cm
Seeing     Strong flickering Clear
Camera Type  Flea3-03S3 with ADVS         ADVS
Camera Delay 0
Timing     GPS - time inserted Video with frame analysis
Disappearance  17:58:20.00
Reappearance   18:05:03.10
Comments: Planet / star were just 14 degrees above the horizon and the seeing was very poor. 
The air was bouncing around and I can say it's the worst seeing where I have ever 
attempted an occultation recording.  

_______________________________

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     Strong flickering Clear
Camera Type  G-Star         PAL/CCIR
Camera Delay -0.04
Timing     GPS - time inserted Video with frame analysis
Disappearance  17:59:09.21
Reappearance   18:05:17.53
Comments: Apalling seeing, but R very clear to within 2 frames. 
D was largely obscured by bright limb, but likely to have happened within 
15 seconds of last possible sighting. 
https://www.youtube.com/watch?v=ZBEkCQF9BYA

_______________________________

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     Strong flickering Clear
Camera Type  LN-300-11673   PAL/CCIR
Camera Delay -0.05
Timing     GPS - time inserted Video with frame analysis
Disappearance  
Reappearance   18:05:16.50
Comments: The star emerged faintly 3s prior to the time stated 
(75km lower in the Venusian atmosphere), 
rising slowly in brightness before a more rapid ascent at the end.  
Actual exposure setting was 1/120. 
http://www.youtube.com/watch?v=Zzva-lY6t-c&feature=youtu.be

        

Return to 2014 occultation results



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