Summary details for M10 & M12 Exoplanet Archive-ETSS Data Sets


Las Campanas Observatory 1m Swope Telescope, Michigan-Dartmouth-MIT 1.3m Telescope.


Various 2048x2048 detectors at LCO and MDM.

Observed Region

The M10 and M12 fields were observed using single pointings centered on the cluster center with fields-of-view of between 15° and 24° on the side.

Observed Filters

Observations of NGC 3201 were conducted in both V and I filters. Exposure times were 600s in both filters for the time-series data, complemented by single-epoch shorter exposures for color-magnitude diagram purposes.

Photometric Technique

The data were processed using standard IRAF routines; photometry was done using DoPHOT, subsequent relative photometry using a customized pipeline (resembling standard differential ensemble photometry). Variability detection was based on a chi-squared algorithm, period determination on Minimum-String-Length and Analysis-of-Variance method.

Data Ranges

The data parameters fall into the following approximate ranges:

Field Min Max
RA (2000) 16 56.362 16 57.947
Dec (2000) -4 17.814 -3 53.875
HJD of the
2450199.91 2451318.86
V magnitude 15.64 24.79
I magnitude 14.16 22.98
Total number of stars - 43930
Number of epochs - ~50
Field Min Max
RA (2000) 16 46.414 16 47.980
Dec (2000) -2 08.677 -1 44.688
HJD of the
2449897.80 245131.82
V magnitude 15.51 25.10
I magnitude 14.33 23.08
Total number of stars - 32378
Number of epochs - ~50

Field Images

Figure 1

Figure 1: Color image of M10 with location of detected variable stars.

Figure 2

Figure 2: Color image of M12 with location of detected variable stars.

Download Data Sets

M10 summary file IPAC ASCII format table
M10 light curves Download scripts
M12 summary file IPAC ASCII format table
M12 light curves Download scripts

Primary References