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Monday, 16 April 2012

[BAA-ebulletin 00664] (50000) Quaoar is predicted to occult an 11th magnitude star in Serpens on April 17.

BAA electronic bulletin
On 2012 April 17, 0212 – 0234 UT, the Trans-Neptunian Object Quaoar is
predicted to pass in front of, i.e occult, a magnitude 11.4 star which
will be totally extinguished for a short time, the duration depending on
the geographical location of the observer. An updated prediction issued
on April 4 places the UK and Europe north of the region of greatest
probability of an event; even so, predictions are uncertain, and
monitoring the star for any occultation is desirable.

Interested observers can monitor the star visually or with CCD/video
equipment. The aim is to record the time of disappearance and
reappearance of the star to an accuracy of a few seconds (UT). This can
be achieved with a continuous sequence of short CCD exposures
(e.g 1 to 3 sec) or by visual observation using stopwatches, lap timer
or voice recorder. The total extinction of the star could last for up to
1.8 minutes (108 seconds). Clocks in the equipment used, should be
synchronised to UT so that the timings are reliable.

A prediction and star charts can be found at

The star is at an altitude of 15-20 degrees in the South East, so an
unobstructed horizon is required.

For more information on this or other asteroid occultations, please
contact the ARPS occultation coordinator. Negative and positive
observations (timings) can be reported to:

Tim Haymes
Assistant Director (Occultations)
Asteroids and Remote Planets Section
2012 April 4

BAA-ebulletin mailing list visit:
(c) 2012 British Astronomical Association

Good Clear Skies
Colin James Watling
Various Voluntary work-Litter Picking for Parish Council (Daytime) and also a friend of Kessingland Beach (Watchman)
Real Astronomer and head of the Comet section for LYRA (Lowestoft and Great Yarmouth Regional Astronomers) also head of K.A.G (Kessingland Astronomy Group) and Navigator (Astrogator) of the Stars (Fieldwork)
Information -- And More Info

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