Three positive chords were recorded for this event.

View the TT14 prediction.

Observers:
  1    H Pavlov,St Clair, NSW, Australia
  2    D Gault,Hawkesbury Heights,NSW,AU
  3(M) D Herald,Murrumbateman, NSW,AU
  4(M) J Bradshaw,Samford Valley, QLD,AU
  5(P) Prediction, TT14,  July 29

    

Discussion:

The ellipse above is plotted at the same area as the expected 73 km diameter of Nerthus..
With two chords we can be confident of the path of Nerthus and that it was south of the predicted line.
The DAMIT database of asteroid models produced two possible models of the projection of Nerthus at the time of the event. The size of the 3D model has been adjusted to approximate the the same area as that of the ellipse.



Clearly the 2nd one is a better fit to the observations.

The figures below show the Tangra light curve of the occultation.

Pavlov

Gault

Observational Data:

Observation details for MP ( 601 ) Nerthus
By Star              UCAC2 31183183
On 2011-08-05  at 09:07:44.0

_______________________________

Observer   Hristo Pavlov
Location   St Clair, NSW, Australia
Longitude  +150:46
Latitude   -33:48
Altitude   68 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   35 cm
Seeing     Steady Clear
Camera Type  WAT120N        PAL/CCIR
Camera Delay 0.02
Timing     GPS - time inserted Video with frame analysis
Disappearance  09:08:00.54
Reappearance   09:08:01.82
Comments: The event was 25 sec late. Video file got corrupted and I only
processed 20 sec around the event which part was good I didn't reset the
KIWI after the event. I reset it 30 min later and it showed "error use fieldcount"
so the reported times may be off by a constant.
[ An adjustment of -1.5 secs has been applied to Hristo's data in plots above - jt]

Report prepopulated by IOTA Reporting Add-in for OW ver.1.6

_______________________________

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     Steady Clear
Camera Type  WAT120N        PAL/CCIR
Camera Delay 0.09
Timing     GPS - time inserted Video with frame analysis

Missed

Comments:   Report prepopulated by IOTA Reporting Add-in for OW ver.1.6

_______________________________

Observer   Dave Gault
Location   Hawkesbury Heights,QLd,AU
Longitude  +150:38
Latitude   -33:39
Altitude   286 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   30 cm
Seeing     Steady Clear
Camera Type  WAT120N        PAL/CCIR
Camera Delay 0.33
Timing     GPS - time inserted Video with frame analysis
Disappearance  09:07:56.16
Reappearance   09:07:59.00
Comments: