Koma (komet): Perbedaan antara revisi

With basic Earth-surface based telescope and some technique, the size of the Coma can be calculated.<ref name=levy>[http://books.google.com/books?id=2AzBYCYV9ucC&pg=PA127&dq=comet+coma&hl=en&sa=X&ei=FtWpUtrGOpSrsQS59AE&ved=0CC0Q6AEwAA#v=onepage&q=comet%20coma&f=false David. H. Levy - David Levy's Guide to Observing and Discovering Comets - Page 127]</ref> Called the drift method, one locks the telescope in position and measures the time for the visible disc pass through the field of view.<ref name=levy/> That time multiplied by the cosine of comet's declination, times .25 should equal the coma's diameter in arcminutes.<ref name=levy/> If the distance to the comet is known, then the apparent size of the coma can be determined.<ref name=levy/>