Overview of Data Preview 1

General information about the observations that comprise the dataset.

LSST Commissioning Camera

All observations were obtained with the LSST Commissioning Camera (LSSTComCam).

• LSST Commissioning Camera

Observations

The fields, filters, and number of visits.

• Observations
  • Field centers
  • Filters
  • Epochs (nights)
  • Coadd tracts

Image quality

A summary of the mean PSF for visit images, and the coadded depth.

• Image quality
  • Visit PSF size
  • Visit magnitude limits
  • Coadded image depths

Image artifacts

Artifacts from the camera or processing that are visible in the data.

• Image artifacts
  • Masked artifacts
  • Optical system
  • Camera detector
  • Interpolation
  • Background subtraction artifacts

Known issues

Descriptions of known issues with the processing, data, or metadata, and recommended mitigation strategies.

• Known issues and subtleties
  • Crowded fields and deblend skipping
  • WCS FITS approximations and misleading interfaces
  • Image units
  • Aperture corrections
  • Flag columns
  • Forced photometry variants and blending
  • Calibration source catalogs and flags
  • Ellipse parameterizations and units
  • PSF models leak memory
  • g-band red leak / excess long-wavelength transmission
  • Incorrect geometric scaling in DP1 Right Ascension errors