Positive Occultations were recorded by Dave Gault and Hristo Pavlov, using video OSD technique.

and 2 clearly observed misses were recorded for this event.

View the updated prediction.

Observers:
  1(M) R O'Keeffe,Onewhero, Tuakau, NZ
  2    H Pavlov,Alpine,NSW,AU
  3    D Gault,Razorback Range,NSW,AU
  4(M) D Gault,Hawkesbury Heights,NSW,AU
  5(P) Prediction  15 April

    

Discussion:

The ellipse above is plotted at the same area as a circle of the expected 74 km diameter of Marghanna. With two chords and releatively close by misses we can be sure that the center line is close to predicted path but about 13 seconds early.

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

Dave Gault

Hristo Pavlov

Observational Data:

Observation details for MP (735) Marghanna
By Star              TYC 5576-00268-1
On 2010-05-04  at 11:46:55.0

_______________________________

Observer   Dave Gault
Location   Razorback Range,NSW,AU
Longitude  +150:40
Latitude   -34:08
Altitude   311 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   20 cm
Seeing     Steady Clear
Timing     GPS - time inserted Video with frame analysis
Disappearance  11:46:41.27
Reappearance   11:46:44.31
Comments: Light curve and .csv file attached
Report prepopulated by IOTA Reporting Add-in for OW ver.1.4

_______________________________

Observer   Rory O'Keeffe
Location   Onewhero, Tuakau, NZ
Longitude  +174:54
Latitude   -37:19
Altitude   210 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   28 cm
Seeing     Strong flickering Broken cloud
Timing     GPS - time inserted Video with frame analysis

Missed

Comments: Camera: Watec wat-902H3 This star was at the limits of my equipment.
Limovie was used to analyse because of the flickering

At first this was thought to be positive but close inspection of light curve
showed mag drop was too small [jt]

_______________________________

Observer   Hristo Pavlov
Location   Alpine,NSW,AU
Longitude  +150:31
Latitude   -34:24
Altitude   629 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   20 cm
Seeing     Slight flickering Clear
Timing     GPS - time inserted Video with frame analysis
Disappearance  11:46:40.69
Reappearance   11:46:44.77
Comments: WAT-902H, Gamma = HI (0.45), event was 15 sec early
http://www.hristopavlov.net/Observations/Positives/2010-05-04%20Marghanna/Event.html
Report prepopulated by IOTA Reporting Add-in for OW ver.1.4

_______________________________

Observer   Dave Gault
Location   Hawkesbury Heights,NSW,AU
Longitude  +150:38
Latitude   -33:39
Altitude   286 m
Datum      WGS84
Telescope Newtonian
Aperture   25 cm
Seeing     Steady Clear
Timing     GPS - time inserted Video with frame analysis

Missed

Comments: