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OCCULTATION OF UCAC4 298-143098 BY 231 Vindobona
2016 April 24

A 17.9 second occultation was recorded by Brian Loader from Darfield on the South Island of New Zealand. No other observations were reported for this event.

View a prediction here.

  1    B Loader,Darfield                    
  2(P) Prediction


Vindobona occultation__ 2016 April 24


The circle above is plotted at the expected 74 km diameter of Vindobona. As can be seen from the lightcurve below, this is an extremely 'shallow' occultation with (231) Vindobona significantly brighter than the occulted star. There is therefore some degree of uncertainty in the timing of the disappearance and reappearance and even if an occultation has occured. After careful review by Dave Herald using AOTA and Tony George using R-OTE, it is reasonably confirmed that an occultation occurred and the time derived have been used in this report. With only one chord it is not possible to determine whether Brian was east or west of the centreline of Vindobona.

The figure below shows the Tangra light curve of the occultation.

Vindobona  occultation__ 2016 April 24

Observational Data:

Observation details for MP ( 231 ) Vondobona
By Star              UCAC4 298-143098
On 2016-04-24  at 11:15:35.0


Observer   B. Loader
Location   Darfield
Longitude  +172:06
Latitude   -43:28
Altitude   210 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   25 cm
Seeing     Slight flickering Clear 95% moon 32° away
Camera Type  Watec 910BD    AAV-PAL       
Camera Delay 
Timing     GPS - time inserted Video with frame analysis
Disappearance  11:16:46.43
Reappearance   11:17:04.35
Comments: Occult Prediction: combined mag 13.4, expected d mag 0.39 (30%), Event T max 21.9 sec, Pred time error 47s,  Prob of event 11%  Times as generated by AOTA, with integration delay applied.


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