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Using Aladin prototype v10 (6/6/2017) and TOPCAT v4.4 on MacOS

Standard planetary mapping in TOPCAT


• Standard setup for planetary maps in TOPCAT SkyPlot is:

(in Axes / Projection)
Projection =  sin (i.e. sphere, spherefor orthographic), but car (cylindrical) is also possible
Uncheck Reflect longitude axis,
View Sky System: Equatorial,


• Standard setup for planetary maps in TOPCAT PlanePlot is(cylindrical):

(in Axes / Range)
Set Max X value to 360
Central meridian will  be on left side

• To put Central the central meridian at the center:

(in Axes / Range)
Min / Max X = -180 / 180


• Add new synthetic column providing healpix cell number (right-click on table column header and enter new column description):

   healpixNestIndex( 6, longitude, latitude )

(adapt scale to data in use, 6 provides a resolution of ~ 1° at the Equator)


- send as s_region from VESPA client (to Aladin) — (s_region is currently provided in this service with W longitudes, so this will workproject correctly)

- select them in Aladin with pointer


- You can save it from File > Export Planes (save preferably as fits for reuse)

This worksis OK and very quick.

• Then: test intersections with something else.