From: Kyle Dawson (kdawson@lbl.gov)
Date: Wed Oct 19 2005 - 13:01:36 PDT
I just want to send out the reminder that we do need 2 clusters to fill
the extra orbits left open due to guide star constraints and other
scheduling considerations. In looking more closely, I see that we
currently have 14 free orbits, and I do expect a few more to open up in
the course of the next few months. Targets with an RA of 09:00-10:00
are just rising now for HST observations, depending on DEC. As a
general rule of thumb, targets become visible from HST about a month or
two before they become visible from the ground, where ground visibility
is defined as 3 hr at less than 2 airmass.
My personal favorite for a substitute cluster is still the controversial
and well studied MS1054. At least 8 of its members are radio sources,
17% of its members are in the process of a merger, more than 80 members
are spectroscopically confirmed and typed, already has I' and z'
reference images from ACS, and is extremeley rich and massive. It also
has deep X-ray images and deep SZ images along with a SN from one of our
searched several years ago, if we get another SN in this cluster we can
combine the multiple measurements and write up a result for a fairly
well measured distance to a specific object and compare methods, which I
don't believe has really been done before at such high z.
-Kyle
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