Data Columns in the MOA Time Series Data

The NASA Exoplanet Archive provides access to 9 years of historical MOA photometric time series data, spanning 2006–2014. In total, there are ~6,000 light curves across 22 target fields. A map of the observational footprint (i.e., the MOA target fields) and the actual data files can be accessed from the MOA Mission page.

The following table defines a subset of the data columns in the MOA data set. If you have questions about the MOA data set, submit a Helpdesk ticket.

Column Description
HJD Heliocentric Julian Date of observational epoch
flux Number of counts measured for observational epoch: for a MOA magnitude of 20, this is 691.8 for magnitude of 20 for chip2 and 1,445 for all other chips
flux_err Uncertainty in measured flux for observational epoch
obsID Run number, i.e., B#
JD Julian Date of observational epoch
fwhm Seeing estimated from the full-width half-maximum (FWHM) in arcseconds
sky Sky level in counts on raw images
airmass Airmass of observational epoch
nstar Number of resolved bright stars by "probe" (it is small if there are problems on the image)
scale Numerical factor used to scale image relative to the reference image
exptime Exposure time of the observational epoch in seconds
skydiff Sky level in counts on the difference image (a residual of the Difference Imaging Analysis)
χ2 Chi-square of PSF fitting on the difference images. Two parameters are used in PSF fitting (χ2/dof is (/npix-2))
npix Number of pixels used in PSF fitting
airmass1 Aairmass calculated in the de-trending code (available only in .cor)
ang1 Angle relative to zenith calculated in the de-trending code (available only in .cor)

Last updated: 4 April 2019