Subject: Re: Pre-telcon Astrometry

From: Daniel Eisenstein

Submitted: Thu, 24 Apr 2003 10:33:56 -0700

Message number: 117 (previous: 116, next: 118 up: Index)

>    Survey Filters:
>             Proposed Sloan g', r', i', z' is fine, and adding Y' would
>                  be better.  Extended red sensitivity enables looking
>                  for intrinsically cooler objects.
>
>             ND filter.  I hate to raise this to the level of a Requirement,
>                  but I think that we must consider LSST in the fabric of
>                  catalogs and systems available to the community.  It
>                  would be unfortunate if the stars fainter than 18
>                  had mas-class astrometry and 2% photometry when the stars
>                  from 12 to 17 did not.  Maybe this will go away if
>                  Pan-STARRS or other projects succeed, but LSST should
>                  not forget this issue.

A point and a question:

Point regarding ND filters: CMOS lets us have our cake and eat it too.
But if that technology isn't ready, it seems pretty unlikely that any
other science is going to vote for stopping down the telescope!

Question:

Doesn't Gaia cover mag 12 to 17 to far better precision than LSST?
Are there any gaps in parameter space that aren't well covered between 
the two?  

Thanks,
Daniel

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