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
