Comment 4 for bug 827443
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| Miguel de Val Borro (miguel-deval) wrote | #4 |
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The attached script has the astrometric RA and DEC from the Herschel data corresponding to the mid-date of the observations compared with the coordinates calculated by Pyephem using the orbital parameters from Horizons. There is a difference of about 1 degree in RA, also for a_ra and g_ra. The coordinates in the data agree with the value from the Horizons on-line ephemeris system when the observer is defined as Herschel observatory (code 500@-486), although I would expect that the astrometric coordinates should not depend on the observer frame. Is it possible to define the location of the observer as Herschel satellite in Pyephem?