Four Positive observations were recorded using video OSD technique.

View the updated prediction.

Observers:
  1    J Broughton,Reedy Creek, QLD,AU
  2    J Broughton,Tyagarah, NSW,AU
  3    D Gault,Hawkesbury Heights,NSW,AU
  4    H Pavlov,St Clair, NSW, Australia
  5(P) Prediction, 12 Nov

    

Discussion: The ellipse above is plotted at the best fit to the four chords. It gives an area about 12% smaller than the expected circle. It is also more elongated at 1.3 than the estimated maximum of 1.18 from lightcurrve inversion.

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

John Broughton Home

John Broughton Mobile

Dave Gault

Hristo Pvlov

Observational Data:

Observation details for MP (386) Siegena
By Star              UCAC2 27774622
On 2010-12-30  at 09:56:00.0

_______________________________

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     Steady Clear
Camera Type
Camera Delay
Timing     GPS - time inserted Video with frame analysis
Disappearance  09:56:03.02
Reappearance   09:56:08.14
Comments: Unattended drift-through observation with a Watec 120N+ at 8x.
The star is out of focus and therefore appears faint.
The profile from Limovie is noisy but does show a five-second dip that might
be an occultation. (It looks valid in the plot - jt)
A graph of a brighter star didn't have such a dip,
ruling out the possibility of a change in transparency.

_______________________________

Observer   John Broughton
Location   Tyagarah, NSW,AU
Longitude  +153:34
Latitude   -28:36
Altitude   3 m
Datum      WGS84
Telescope Newtonian
Aperture   31 cm
Seeing     Steady Clear
Camera Type
Camera Delay
Timing     GPS - other linking Video with frame analysis
Disappearance  09:55:54.40
Reappearance   09:56:07.84
Comments: An alignment problem resulted in faint comatic images,
however a definite disappearance shows up in the profile.
Less certain is the location of reappearance,
as indicated by the light green section of the graph.
The specified time of reappearance represents the middle of that section
and the uncertainty has been increased accordingly.

_______________________________

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
Camera Type
Camera Delay
Timing     GPS - time inserted Video with frame analysis
Disappearance  09:54:50.80
Reappearance   09:55:09.20
Comments: Sun at -9 degrees.
WAT-120N @ 4 frame stack ID=-0.11
Light curve included with this report.

_______________________________

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   20 cm
Seeing     Steady Clear
Camera Type
Camera Delay
Timing     GPS - time inserted Video with frame analysis
Disappearance  09:54:51.71
Reappearance   09:55:08.63
Comments: http://www.hristopavlov.net/Observations/Positives/2010-12-30%20Siegena/Event.html
Recorded with WAT-120N+ with 8 frame integration.
Instrumental delay not corrected in time here (but is in final result).
Report prepopulated by IOTA Reporting Add-in for OW ver.1.5