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- W3169975156 abstract "The asteroid (147857) 2005 UW381 will pass over the supergiant star Betelgeuse on January 2 2012. The event is visible on a limited geographical region, and the magnitude drop is only 0.01 magnitudes for a maximum duration of 3.6 seconds. The opportunity to measure this phenomenon can be interesting for dealing with extrasolar planetary transits. The occultation: The data on the partial asteroidal occultation are presented in the image available at the web link http://www.asteroidoccultation.com/2012_01/0102_147857_29098_Map.gif We can to do the following considerations: assuming that Betelgeuse has a diameter of 31 mas (as indicated in that website) and the asteroid has a diameter of 3 mas. The ratio between the areas is (3/31)2 and the luminosity of Betelgeuse will be [1-(3/31)2]*100%=99.06% of its maximum In terms of magnitude the difference according to the Pogson’s law the decrease of the magnitude of the star will be 2.5·log(0.9906)= -0.0102 magnitudes Fig. 1 A sketch of the phenomenon made by Alfons Gabel (IOTA/ES). The extension of the stellar atmosphere stellar could be measured by timing that passage from different locations along the predicted path of visibility of that transit." @default.
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- W3169975156 date "2011-12-01" @default.
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- W3169975156 title "The partial asteroidal occultation of Betelgeuse on Jan 2, 2012" @default.
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!["The asteroid (147857) 2005 UW381 will pass over the supergiant star Betelgeuse on January 2 2012. The event is visible on a limited geographical region, and the magnitude drop is only 0.01 magnitudes for a maximum duration of 3.6 seconds. The opportunity to measure this phenomenon can be interesting for dealing with extrasolar planetary transits. The occultation: The data on the partial asteroidal occultation are presented in the image available at the web link http://www.asteroidoccultation.com/2012_01/0102_147857_29098_Map.gif We can to do the following considerations: assuming that Betelgeuse has a diameter of 31 mas (as indicated in that website) and the asteroid has a diameter of 3 mas. The ratio between the areas is (3/31)2 and the luminosity of Betelgeuse will be [1-(3/31)2]*100%=99.06% of its maximum In terms of magnitude the difference according to the Pogson’s law the decrease of the magnitude of the star will be 2.5·log(0.9906)= -0.0102 magnitudes Fig. 1 A sketch of the phenomenon made by Alfons Gabel (IOTA/ES). The extension of the stellar atmosphere stellar could be measured by timing that passage from different locations along the predicted path of visibility of that transit."](?object=%22The%20asteroid%20(147857)%202005%20UW381%20will%20pass%20over%20the%20supergiant%20star%20Betelgeuse%20on%20January%202%202012.%20The%20event%20is%20visible%20on%20a%20limited%20geographical%20region%2C%20and%20the%20magnitude%20drop%20is%20only%200.01%20magnitudes%20for%20a%20maximum%20duration%20of%203.6%20seconds.%20The%20opportunity%20to%20measure%20this%20phenomenon%20can%20be%20interesting%20for%20dealing%20with%20extrasolar%20planetary%20transits.%20The%20occultation%3A%20The%20data%20on%20the%20partial%20asteroidal%20occultation%20are%20presented%20in%20the%20image%20available%20at%20the%20web%20link%20http%3A%2F%2Fwww.asteroidoccultation.com%2F2012_01%2F0102_147857_29098_Map.gif%20We%20can%20to%20do%20the%20following%20considerations%3A%20assuming%20that%20Betelgeuse%20has%20a%20diameter%20of%2031%20mas%20(as%20indicated%20in%20that%20website)%20and%20the%20asteroid%20has%20a%20diameter%20of%203%20mas.%20The%20ratio%20between%20the%20areas%20is%20(3%2F31)2%20and%20the%20luminosity%20of%20Betelgeuse%20will%20be%20%5B1-(3%2F31)2%5D*100%25%3D99.06%25%20of%20its%20maximum%20In%20terms%20of%20magnitude%20the%20difference%20according%20to%20the%20Pogson%E2%80%99s%20law%20the%20decrease%20of%20the%20magnitude%20of%20the%20star%20will%20be%202.5%C2%B7log(0.9906)%3D%20-0.0102%20magnitudes%20Fig.%201%20A%20sketch%20of%20the%20phenomenon%20made%20by%20Alfons%20Gabel%20(IOTA%2FES).%20The%20extension%20of%20the%20stellar%20atmosphere%20stellar%20could%20be%20measured%20by%20timing%20that%20passage%20from%20different%20locations%20along%20the%20predicted%20path%20of%20visibility%20of%20that%20transit.%22){kind=link}