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The large asteroid on January 25

Nel tardo pomeriggio di martedì 25 gennaio il pianetino (144) Vibilia occulta una stella relativamente luminosa (di magnitudine visuale +9,9) nella costellazione dell'Ariete, denominata TYC 1228-00368-1. Il fenomeno interessa il nord Italia intorno alle 18.34 dei nostri orologi (le 17.34 TU).

L'asteroide è piuttosto grande (160 km), così che la durata massima nel caso di occultazione centrale giunge a 12,6 secondi. Il calo di luce è netto, maggiore di 2 magnitudini, and being removable, the magnitude +12.1, owners of telescopes from the sighted could 15cm in seconds when the star is obscured. The key, however, as in every asteroid occultation, it is time to better the times of disappearance and reappearance of the star.

There lunar disorder, finding the Moon below the horizon, but the sky is still a bit 'light, since the event during astronomical twilight. In any case, the low light of dusk should in no way interfere with the observation, given the brightness of the star. Italy is the north star high sixty degrees at the time of the occultation.

What makes this event very interesting is the likelihood of success, and that is to actually see the occultation as "positive": the center of the band occultation provided you have 97.7%! At the edge we have a decent 50%, while the standard distance of 1-sigma you still have a 15.9%. This means that the position of the asteroid is known with great precision, and that the observations of the occultation will help to refine it further. The uncertainty of time of the event, in light of this, it is limited to only 3 seconds.

The map above was obtained with a valid software Occult Watcher , which is able to interface with the predictions of asteroid occultations Google Earth, even placing the positions of the people-watchers who propose to groped observation. The band is bounded by the expected occultation of blue lines, while the green line corresponds to the center. The red lines separate the 1-sigma distance (thick line) and 3-sigma (thin line), outside which the probability of success drops to zero. We see that in practice throughout northern Italy and various European regions nearby, like the Swiss canton of Ticino, are favored. My position (Santhià) is indicated by the black telescope, but some time you are booked on other observers server di Occult Watcher per seguire l'evento, alcuni anche in Italia. Le righe sottili in grigio sono le "corde" dei singoli osservatori, sempre utili, poiché in questo modo chi si sposta per osservare può scegliere un posto lontano da esse, allo scopo di tratteggiare meglio la forma del pianetino.

A Santhià mi trovo ad appena 1.700 metri a nord-ovest del centro della fascia, con la probabilità che, come già detto, raggiunge il 97,7%. Ugualmente ben piazzati, in Lombardia, Lorenzo Comolli e Carlo Gualdoni, ma anche Stefano Sposetti in Ticino. Questo rappresenta il fulcro del nostro gruppo di osservatori, al quale speriamo si aggiungano altri astrofili, anche se magari solo occasionalmente affected by such an event.

Sposetti Stefano wrote an invitation observation of this phenomenon, while on my blog you link to an old post that generically describes the asteroid occultations. Full details of the event (144) removable, are the site of Steve Preston.