International Occultation Timing Association

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Occultations by




Pluto, TNOs



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New Updates! 9th of April!

Occultation of 3UCAC 064456146 (11m6) by (50000) Quaoar on 2012 April 17 for

the Atlantic Ocean, Africa and Near East. Probably also southern Europe

An occultation by (50000) Quaoar of a 11m6 star can be observed in the morning of the 17th of April 2012 at approx. 2h 10min UTC.

The occultation is very well in reach of many video and digital camera systems attached to telescopes as small as 8 inch. We urgently ask everybody, to take part in the international campaign for observation.

The goal is to determine the diameter of Quaoar and find out, if the TNO has an atmosphere. Therefore, not only the determination of the exact time point of dis- and reappearance is necessary, but also the exact determination of the lightcurve during dis- and reappearance of the star behind the disk of Quaoar.

On this site, more infos will be posted, to give you informations about how to observe.

Satellite of (50000) Quaoar will occultat the star about 15 minutes AFTER the main body.

Have a look at the following graph:

Timeline of observations:

As written on Felipe's webpage, nothing has to be added:

The observations should be performed from 02:05UT to 02:25UT for Quaoar, and from 02:23UT to 02:38UT for Weywot, whatever you are.

So the best is a big sequence of observation, from 2:05UT to 02:38UT.

New astrometric updates of the occultation track have been calculated based on images from Francois Colas made at Pic Du Midi on the 9th of April. Images have been measured by himself, Raoul Behrend and Julio Camargo. The most precise prediction of the track can be seen as follows:

More informations about final updates of the astrometry can be found on Felipe Braga-Ribas (LESIA) Website about this events.

Keep an eye on the Website of Felipe!