Welcome to Chandra Science Center |
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| This is the Web interface to the Observation Visualizer at Chandra Science Center in Cambridge, Massachussets, USA. |
| Currently it allows the viewing of Roll, Pitch, and Visibility Plots in Postscript format. The plot uses a recent projected Chandra ephemeris. Since Chandra's orbit does not change much from year-to-year, plots are also closely applicable for any mission year. |
| You will need to have your browser configured correctly to reliably view the postscript plots. The ObsVis FoV overlay program is available within CIAO: our website. For more information please consult the online obsvis help page: online obsvis help page. |
| To use: enter the J2000 sky coordinates of the source of interest in the boxes on the left and click on 'View Plot'. A number of different input formats for RA and DEC coordinates of the target are accepted. Alternatively, use the name resolver functionality if a target name is known. |
| Plots: the plot shows the source visibility in blue, the roll angle in green, and the pitch angle in red as a function of time on the x-axis. |
| Data: the data used to make these plots can also be viewed as text: Julian DateD-2451000, Nominal Roll, Percent Visibility, Plus and Minus Roll Tolerance, Pitch Angle |