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.
Observers: 1 B Loader,Darfield 2(P) Prediction
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.
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.