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Old 08-07-2014, 06:03 AM
robin_astro
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Join Date: Jun 2009
Location: UK
Posts: 73
Like Paolo Beradi did last year for example on L4 Panstarrs
http://www.spectro-aras.com/forum/vi....php?f=6&t=567

You can still guide on the coma, offset from the slit on the tail, either using a reflective slit if the field is wide enough or alternatively using an off axis guider or separate guide scope.

Using a slit can sometimes have its downsides though as seen here when trying to distinguish between atmospheric Na emission and that from the comet.


Robin
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