Re: Hale-Bopp

[P3D John Ohrt <johrt@xxxxxxx>]

P3D Larry Berlin wrote:
> >From: P3D  Richard M. Koolish  writes:
> >
> >Hale Bopp was 10 times farther away from earth than Hyakutake, so its
> >relative motion against the background stars was much less.  That's why
> >it was harder to get a stereo shot of Hale-Bopp.> 

> If that's the case, there must be a possibility that images from a greater
> time span might provide the view desired? Of course the background stars
> wouldn't fit at all, but that I can fix.

As I understand it, you would select the time interval such that the
background stars would register as "infinity" and the movement of the
comet relative to the stars would provide the stero effect.

I think the problem with HB was that this interval is relatively long
and unless you are truly fortunate, you will have difficulty matching
the "sky" levels between the two shots without loosing the fine detail
in the tail structure.

Up here, the required observing conditions were rarely if at all
available.  I belong to an astroclub, and all the images I have seen,
some of them of awesome quality, differed in this area.

Regards,
John
--
John Ohrt,  Regina, SK, Canada
johrt@xxxxxxx


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