RE: [ccd-newastro] SBIG guidestars
- The best way is to plan ahead.
I use theSky. It has field of view indicators for SBIG cameras that include
both imaging and guide chips. Once you have the orientation mastered you can
easily see if there will be a suitable guidestar on the guide chip.
The indicator also includes rings around the path of the guidechip so you
can easily see if a guidestar would be made available by rotating the
It is something of a pain to rotate the camera, so I will compile a list of
targets, then check each with theSky for a guidestar, then sort the targets
into camera-orientation order. i.e. all targets that have a guidestar with
the camera pointing north, only rotating the camera when I have finished
objects in the current orientation. After two months I am yet to rotate the
camera, but I'm going to a week-long astrocamp next week and expect to be
doing it many times over :)
I have several of these field of view indicators setup for various focal
lengths and switch between them depending on the current setup.
For the first six months with my new ST7e I used the hit-and-miss method.
i.e. slew to an object, then search around for a guidestar while keeping the
target more-or-less centered. This proved more frustrating than enjoyable,
it's much better to know berforehand if it's even worth slewing to the
>From: billypatt@... [mailto:billypatt@...]
>Sent: Monday, August 06, 2001 11:52 AM
>Subject: [ccd-newastro] SBIG guidestars
>I use a SBIG ST7E for imaging. I routinely have difficulty in
>finding suitable guidestars with the built in guider. A 2-3second
>image has about a 50% change of hitting a good one [maybe]. I asked
>another guy in The Orange County Astronomers using the same setup
>Astroimagers group and he reported similar difficulties. Any
>thoughts on how to work the guider to best advantage?
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