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Below is a list of the presently available mixins and the columns they can calculate.  Click on the name of the mixin to see the import statement needed to find it as well as the columns it can calculate (another this page will discuss discusses how to write your own methods to calculate column values):

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titleAstrometryBase

from lsst.sims.coordUtils.Astrometry import AstrometryBase

note that importing CameraCoords, AstrometryStars, or AstrometryGalaxies will give you access to the methods in AstrometryBase, as those mixins inherit from AstrometryBase

provides:

  • glon, glat - the galactic longitude and latitude of a source in radians
  • x_focal_nominal, y_focal_nominal - an object's (x,y) position on the focal plane, assuming a perfect gnomonic projection (this is not actually the object's pixel coordinates; that is provided elsewhere)
  • x_pupil, y_pupil - an object's pupil coordinates in radians
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titleAstrometryGalaxies

from lsst.sims.coordUtils.Astrometry import AstrometryGalaxies

provides:

  • All of the columns from AstrometryBase above
  • raObserved, decObserved - the apparent RA and Dec for an object in radians.  Applies precession, nutation, aberration, and atmospheric refraction
  • raPhoSim, decPhoSim - raObserved and decObserved but neglecting refraction by the atmosphere (this is because phoSim handles refraction itself and requires the user to supply unrefracted apparent positions for objects)

...

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titlePhotometryStars

from lsst.sims.photUtils.Photometry import PhotometryStars

provides:

  • lsst_[u,g,r,i,z,y] - the magnitude in the LSST [u,g,r,i,z,y] band
  • sigma_lsst_[u,g,r,i,z,y] - the magnitude uncertainty in lsst_[u,g,r,i,z,y]
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titleVariability

from lsst.sims.photUtils.Variability import Variability

provides:

  • lsst_[u,g,r,i,z,y]_var - lsst_[u,g,r,i,z,y] from PhotometryStars with a magnitude offset applied to account for a source's variability
  • stellar_magNorm_var - the star's normalizing magnitude (for purposes of running phoSim) with an offset applied for source variability
  • sigma_lsst_[u,g,r,i,z,y]_var - the magnitude uncertainty in lsst_[u,g,r,i,z,y]_var
  • lsst_[u,g,r,i,z,y]_var - lsst_[u,g,r,i,z,y] from PhotometryGalaxies with a magnitude offset applied to account for a sources variability
  • [u,g,r,i,z,y]Agn_var - the same as above for [u,g,r,i,z,y]Agn
  • magNorm_total_var - the galaxy's normalizing magnitude (for purposes of running phoSim) with an offset applied for source variability
  • sigma_lsst_[u,g,r,i,z,y]_var - the magnitude uncertainty in [u,g,r,i,z,y]Recalc_var
  • sigma_[u,g,r,i,z,y]Agn_var - the same as above for [u,g,r,i,z,y]Agn_var
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titleEBVmixin

from lsst.sims.photUtils.EBV import EBVmixin

provides:

  • EBV - the E(B-V) value for a source
  • galacticRv - Rv due to extinction in the Milky Way

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