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A 7.3 second occultation was recorded using the CCD drift-scan technique by Bill Allen in Blenheim, New zealand..
View the Updated Prediction
Observers: 1 W.H. Allen, Blenheim, NZ 2(M) P.Litwiniuk, Pakenham, Vic, Australia M = MissA negative report was also received from Diana Watson in Whakatane, well north of the track.
The circle represents the predicted 116 km diameter of Brixia.
Drift-scan trace:
Discussion:
This was another success for Bill Allen and the drift-scan technique. The maximum expected duration was 11.8 seconds and Bill's observed duration was 7.3 seconds, but it is not possible to determine whether Bill was north or south of the centre line. Peter Litwiniuk in Victoria was well north of the track.
Observational Data:
Observer's Name : Bill Allen
Aperture (cm) : 32 cm
Focal length (cm) : 224
Type (e.g. SCT; Newtonian) : Dall Kirkham, with a f3.3 focal reducer
Magnification :
Observing site name : Vintage Lane Observatory
Longitude (DD MM SS ; East +ve) : 173.85 E
Latitude (DD MM SS ; South -ve) : -41.50
Height above Sealevel (metres) : 30
Geodetic Datum (e.g.WGS84,NZ1949): NZ1949 (topographical map)
Height Datum (if known) : MSL
Sky Transparency (Delete two) : Good
Star Image Stability (Delete two): Good
Other Conditions:
(Wind, Clouds, Lights, etc.): NW wind with no visible clouds.
Time Source (e.g. WWVH, GPS) : WWVH time signals,Loader beeper synchronised manually
Recording method (e.g. tape) : Drift Scan, time signals on tape, analysed with Goldwave.
Could you see the Asteroid? : Yes
Approx. Limiting Magnitude : 16
| Estimated |
Universal Time | Reaction | Accuracy, Remarks
h m s | Time (sec) |
COLUMN FORMAT TO USE---> __:__:__._ _._ _________________)
Started Observing : 13 57 31.8 0.1
Star & Object Fully Merged : 13 34 25
Disappearance At : 13 57 46.4 0.2
Reappearance At : 13 57 53.7 0.2
Stopped Observing : 13 58 9.1 0.1
Duration seconds : 7.3
Was your reaction time (also known as Personal Equation) subtracted from
any of the above timings? : No
If YES, state value : National time signal synchronisation to within 0.1 second.
ADDITIONAL COMMENTS: John Broughton analysed this event using Scantracker.
Observational Data - Occultation Not Seen:
Observer's Name : Peter Litwiniuk
Aperture (cm) : 20
Focal length (cm) : 203
Type (e.g. SCT; Newtonian) : SCT
Magnification : 81x
Observing site name : Pakenham
Longitude (East +ve) : 145 29 00
Latitude (South -ve) : -38 04 01
Height above Sealevel (metres) : 62
Geodetic Datum (e.g.WGS84,NZ1949): GDA94
Height Datum (if known) :
Sky Transparency (Delete two) : Good
Star Image Stability (Delete two): Good
Other Conditions:
(Wind, Clouds, Lights, etc.): light breeze, intermittent cloud
Time Source (e.g. WWV, GPS) : www.time.gov
Recording method (e.g. tape) : manual
Could you see the Asteroid? : no
Approx. Limiting Magnitude : 13
| Estimated |
Universal Time | Reaction | Accuracy, Remarks
h m s | Time (sec) |
Started Observing : 13 54 45
Stopped Observing : 14 06 10
ADDITIONAL COMMENTS:
No occultation seen.
Observer's Name : Diana Watson
Aperture (cm) : 20
Focal length (cm) : 200
Type (e.g. SCT; Newtonian) : Celestron 8
Magnification : 115 times
Observing site name : Whakatane
Longitude (DD MM SS ; East +ve) : 176 51 50.7
Latitude (DD MM SS ; South -ve) : -37 55 18.5
Height above Sealevel (metres) : 2.8 metres
Geodetic Datum (e.g.WGS84,NZ1949): WGS84
Height Datum (if known) :
Sky Transparency (Delete two) : Fair
Star Image Stability (Delete two): Fair
Other Conditions:
(Wind, Clouds, Lights, etc.): target area low so through ground mists.
Time Source (e.g. WWVH, GPS) : WWVH
Recording method (e.g. tape) : tape recorder
Could you see the Asteroid? : No
Approx. Limiting Magnitude : 12
| Estimated |
Universal Time | Reaction | Accuracy, Remarks
h m s | Time (sec) |
Started Observing : 13:50:00.0
Stopped Observing : 14:04:00.0
ADDITIONAL COMMENTS: Star fell into the orange tree about the fourth minute, so end of monitoring
it, and would have carried on for a few more minutes otherwise.
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