Two Special SEGUE plate pairs have been designed targeting the 
Globular clusters M15 and M2.

See the graphs at:
http://www-sdss.fnal.gov/yanny/seguets/designsep152004/index.html

for some plots.

Basically v2_0 of SEGUE ts was used to design the
plates, with a small modification so that the Globular cluster candidates
'put to the front of the line' for fiber assignment, so they
would be get a spot, assuming no 55'' fiber collision.
The globular cluster candidates took up about 100 fibers on each plate,
(100 bright and 100 faint for a total of about 200 GC targets
for each cluster), the rest of the plate gets other SEGUE targets.

For M15, we started with Kyle Cudworth's bright proper motion list
and were able to target 12 of these bright M15 giants (14 < g < 16).
We may wish to consider slightly shorter than normal exposure times 
on the bright plate to avoid overflow/saturation.
We then added in 38 of the proper-motion selected (slightly fainter)
giants which Jeff Munn matched using USNO-B and Connie Rockosi selected.
We then added 61 more 'color-selected' M15 candidates to the bright plate,
and filled out the bright plate with other SEGUE ts categories.
We also targeted 155 M15 turnoff and upper MS stars using a color and
'closeness to M15' selection.

For M2, we started with Kyle Cudworth's bright proper motion list
and were able to target 9 of these bright M2 giants.
Proper motion was not useful here to separate from the field,
so we just did color selection, getting 71 more M2 objects on the bright
plate and 123 on the faint, filling out the plate area with SEGUE targets.

See the plot link above to see where these objects lie in color/mag
space.

Click on the 'skyServer' links (thanks to Alex's group for this nice
mosaic finding chart maker) for a visual of selected targets 
around the Globulars.

This plate design information has been handed off to Huan for incorporation
into the Sep 15 drill run, we hope that these 4 plates could be 
observed as soon as they are drilled and
shipped. I think they will be visible thru about the end of October or so at the 
beginning of the night.

Plugging the plates, will all the tightly packed fibers around the
clusters will be a good challenge for our plugging crew!

