Last updated 09 May 2019

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Custom Software used at Great Shefford

Ephemeris interpolation

Ephemeris Interploation and exposure calculation Visual Basic program (EphInterpolator)

This allows positions to be worked out quickly and easily from an ephemeris. It was originally intended for when orbital elements were not readily obtainable (e.g. objects still on the NEOCP) so that accurate telescope pointing and rate of motion could be achieved. However, it is now used for all ephemeris work at the telescope and also when reducing measures with Astrometrica, to accurately interpolate between ephemeris intervals.

The MPES button will retrieve an ephemeris from the Minor Planet Center for a target named in the Object box. A drop-down list of objects on the NEOCP allows an ephemeris for an individual NEOCP object to be retrieved, alternatively ephemerides for all NEOCP objects can be retrieved that match the NEO rating and class parameters if the Object box is left empty. Variant orbits from the MPES or NEOCP can also be retrieved.

Pressing the Calculate button works out the RA, Dec, Speed and PA of motion using a second order interpolation method for the specified time.

A separate 'pad' can be undocked from the main form (visible to the right in the screen shot above) which is set to be an 'always on top' window for ease of use when transferring values into other software.

Pressing the blue "Astrometrica" button sends the calculated Speed and PA to Astrometrica and initiates the completion of the Astrometrica "Stack Images" function.


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