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Message Subject COMET C2012/S1 ISON : COMA/TAIL OF OVER 64,400 KM [UPDATE]
Poster Handle Anonymous Coward
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You arent measuring the nucleus. You are measuring the coma which is anywhere from 10,000 to 1,000,000 times the diameter of the nucleus.
 Quoting: Anonymous Coward 35346045



what are you smoking?



The Jan. 30 UVOT observations reveal that ISON was shedding about 112,000 pounds (51,000 kg) of dust, or about two-thirds the mass of an unfueled space shuttle, every minute. By contrast, the comet was producing only about 130 pounds (60 kg) of water every minute, or about four times the amount flowing out of a residential sprinkler system.

"The mismatch we detect between the amount of dust and water produced tells us that ISON's water sublimation is not yet powering its jets because the comet is still too far from the sun," Bodewits said. "Other more volatile materials, such as carbon dioxide or carbon monoxide ice, evaporate at greater distances and are now fueling ISON's activity."

While the water and dust production rates are relatively uncertain because of the comet's faintness, they can be used to estimate the size of ISON's icy body. Comparing the amount of gas needed for a normal comet to blow off dust at the rate observed for ISON, the scientists estimate that the nucleus is roughly 3 miles (5 km) across, a typical size for a comet. This assumes that only the fraction of the surface most directly exposed to the sun, about 10 percent of the total, is actively producing jets.



In addition to this, you can clearly see the beginnings of the comet appearance(coma, tail) in the very image that you yourself are taking your measurment from, and NOT that resembling a solid body alone.
 Quoting: Anonymous Coward 35346045


 Quoting: Anonymous Coward 35346045
 
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