Graze logo

OCCULTATION OF TYC 1094-01128-1 BY 132 Aethra
2013 July 08

A 2.9 second occultation was recorded by Jonathan Bradshaw using video OSD technique, and a 2.6 second one by Peter Anderson using visual observing technique.

View the updated prediction.

  1    J Bradshaw,ord Valley, Qld, Australia
  2    P Anderson,THE GAP,Brisbane,QLD,AU
  3(P) Prediction, 4 July


Aethra occultation - 2013 July 08


The circle above is plotted at the expected 46 km diameter of Aethra. With 2 chords and the fact that Jonathan's was longer that the expected 2.8 seconds, and assuming the updated prediction was approximately correct the longer than expected chord of about 44km would suggest that the chord might lie close to the central portion of the asteroid. With 2chords we can be confident of the path of Aethra and that it was north of the predicted line. The ISAM 3D model has been overlaid on the measured ellipse and shows poor fit

The figure below shows Jonathan's Limovie light curve of the occultation.

Aethra occultation - 2013 July 08

Observational Data:

Observation details for MP ( 132 ) Aethra
By Star              TYC 1094-01128-1
On 2013-07-08  at 19:47:13.0


Observer   Jonathan Bradshaw
Location   Samford Valley, Qld, Australia
Longitude  +152:50
Latitude   -27:22
Altitude   80 m
Datum      WGS84
Telescope SCT including Cass and Mak
Aperture   36 cm
Seeing     Slight flickering Clear
Camera Type  G-Star         PAL/CCIR
Camera Delay 0
Timing     GPS - time inserted Video with frame analysis
Disappearance  19:47:15.85
Reappearance   19:47:18.75
Comments: Nice clear event at 3 frame integration to
mitigate poor seeing


Observer   Peter Anderson
Location   THE GAP,Brisbane,QLD,AU
Longitude  +152:55
Latitude   -27:27
Altitude   170 m
Datum      WGS84
Telescope Newtonian
Aperture   41 cm
Seeing     Steady Clear
Camera Type  Visual
Camera Delay 0
Timing     Tape Recorder + time signal Visual, PE applied
Disappearance  19:47:15.90
Reappearance   19:47:18.50
Comments:  Observation in twilight but star easily visible.
No wind or distractions. A very satisfactory observation.
Star disappeared at occultation (asteroid never seen)


Return to 2013 occultation results

[Site Map] [What's an Occultation?]
[Total Occultations] [Grazing Occultations] [Planetary Occultations] [Jovian Satellite Eclipses]
[Timing Occultations] [Reporting Observations] [Coming Events] [Software]
[About Us] [Publications] [Membership] [Links]

[Top of Page][Return to Home Page]