A 20 second occultation was recorded by Jacqui Milner using an SCT Telescope and Watec 910BD camera.

A 19 second occultation was recorded by Dean Hooper using an SCT Telescope and Watec 910HX camera.

View the IOTA update.

Observers:
  1    J Milner, Bayswater, Victoria, Australia
  2    D Hooper, Melbourne, Victoria, Australia
  3(P) Prediction- IOTA Feed                

         



       

Discussion:

The DAMIT model above is plotted at the expected diameter of Davida. Because the chords are so close, it is not possible to tell if the observers were north or south of the centre line of the event, but they appear to have been close to it. The model has been plotted centred on the observed chords.

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

Hooper:

Observational Data:

Observation details for MP ( 511 ) Davida
By Star              TYC 6890-02714-1 
On 2017-07-11  at 20:44:15.0

_______________________________

Observer   Jacquie Milner
Location   Bayswater, Vic, AUS
Longitude  +145:14
Latitude   -37:50
Altitude   110 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   20 cm
Seeing     Strong flickering Thin cloud < 2 Frost
Camera Type  Watec 910BD    PAL/CCIR      
Camera Delay 
Timing     GPS - time inserted Video with frame analysis
Disappearance  20:44:08.74
Reappearance   20:44:29.14
Comments: Was at a low altitude through thin cloud, and I was having trouble with a new set-up.
 Report prepopulated by IOTA Reporting Add-in for OW ver.1.8

_______________________________

Observer   Dean Hooper
Location   Melbourne, VIC, Australia
Longitude  +145:05
Latitude   -37:59
Altitude   10 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   28 cm
Seeing     Slight flickering Thin cloud < 2 Twilight & nearby Moon
Camera Type  Watec 910HX    PAL/CCIR      
Camera Delay 
Timing     GPS - time inserted Video with frame analysis
Disappearance  20:44:09.66
Reappearance   20:44:28.42
Comments: Challenging conditions.
Low altitude target (15deg), twilight (Sun -10degs), high cloud being lit by nearby full-ish Moon.
Gain reduced to 35dB to increase contrast.  Light curve generation Tangra v3.6.7.  Time analysis AOTA v4.2.8.0.