ngc4147

Number of visits: 6

cohort types: med, short

Priority Levels (in descending order):
'anc': ancillary targets
'hr': stars with existing high resolution spectroscopy
'pm': stars with proper motion data indicating probable cluster membership
'sqo2': W+D giants as selected using Nidever giant selection criteria
    and J-K_raw > 0.3.
'sqo3': low S/N W+D giants as selected using Nidever selection criteria,
     J-K_raw > 0.3, these stars use the H magnitude cuts for long targets
    (12.8 < H_raw < 13.3).
'sqo4': W+D dwarfs as selected using Nidever giant selection criteria and
     J-K_raw > 0.5.
'sqo5': W+D dwarfs as selected using Nidever giant selection criteria and 
    0.3 < J-K_raw < 0.5.
'sqo6': stars with no W+D data and  J-K_raw > 0.3.

Fiber Distribution:
M1 124
S1 126
S2 126



Notes:

IMPORTANT: The giant/dwarf/no W+D photometry selection was incorrect.  We
thought that the giant flag in the SQO files corresponded to -1=dwarf, 0=no W+D,
1=giant but the in reality -1=no W+D, 0=dwarf, 1=giant.  The targets selected in
sqo4 and sqo5 were intended to be stars without W+D photometry are they actually
dwarfs.  The reverse situation occurred with the targets selected in sqo6 (we
wanted to choose dwarfs but got stars without W+D photometry).  Note that the
legend in the CMD is also incorrectly labeled (it reflects the intended
selection criteria, not the acutal selection criteria).



No proper motion targets were selected due to fiber collisions with high
resolution targets. No RV targets were provided.

NGC 4147 is compact on the sky (2 arcmin), so BHA chose to observe 1 medium and
2 short targets as opposed to 2 medium targets to maximize the number of high
resolution targets observed.

Only short targets from the sqo6 priority level were selected to maximize the
number of these targets.

No color cut used for proper motion targets.

Proper motion targets were not randomized.

SQO targets were not randomized from the original SQO, so they were selected
based on position in the sky (not exactly sequentially in RA or DEC, but
clustered on the sky).  The magnitude sampling was still essentially random.

Used uncorrected colors for color cut on SQO targets.

Used fiber jacket diameter of 70", which is too small to avoid all fiber
collisions (need 71.5").

Revision of gc_target_ngc4147.py used to select target list: 127846