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Sky Charts |
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Comet observation Hale-Bopp, February 16 1997.
Click on image for full resolution Press "Alt" key then click on the comet. We obtain the following screen instead of the status bar information. It shows the comets azimuth and elevation position,and rise, transit and set times
You can change some display variables such as coordinate grids, or zoom the comet nucleus for example.
Click on image for full resolution The central dot corresponds to the comets total magnitude, and the circle indicates the coma diameter. The line corresponding to the tail shows the anti solar direction. This corresponds to the plasma tail direction near the nucleus and gives sufficient precision up to some ten's of degrees from the nucleus. The tail length and coma diameter cannot be accurately predicated and the value show on the chart are calculated using a personal cooking recipe that uses magnitude parameters from the ephemeris and the comets orientation relative to Earth. The results are encouraging for all the comets that I have to show. If you know of a more serious work on this subject I would be very interested in further details. To obtain information for a longer period you can use the Calendar function. We obtain the position, magnitude, Sun elongation, phase (the angle between the tail and Earth), rise, culmination and set time for our observation place. Click on image for full resolution The right part of the window show the position of the comet at the twilight
time.
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