From: Marc Postman (postman@stsci.edu)
Date: Wed May 04 2005 - 06:21:08 PDT
Lori et al.,
This position of course is well within the GTO pointing so we have the
archival reference image. FYI, below is a plot of the position of the
red sequence objects in the ACS frame for CL1604+4304. The blue "X"
corresponds to your position. The intersection of the red lines is the
mean position of the red sequence objects (1.47 < [V-I] < 2.25) in our
ACS image, which corresponds to 16:04:22.6 +43:04:39.72. The position I
cited yesterday is denoted by the green diamond in the figure. So my
revised position given by the red lines might be a compromise - it's
17.5 arcsec from yours and 16 arcsec from my original position of last
night. But I will leave it to Lori's assessment.
Cheers,
Marc
------------------------------------------------------------------------
--------
Marc Postman Email: postman@stsci.edu
STScI - CMO Phone: +1-410-338-4340
3700 San Martin Drive Fax: +1-410-338-4424
Baltimore, MD 21218 U.S.A. http://www.stsci.edu/~postman
On May 3, 2005, at 10:10 PM, Lori Lubin wrote:
> Based on
> wide-field imaging and new spectroscopy, the density peak of the red,
> elliptical-like galaxies is actually
>
> 16 04 20.91 +43 04 40.6
>
> about 35 arcsec off from the old pointing.
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