What is the Spectral Classification Program (SCP)?
Early on, the Kepler Project realized the need for homogeneous ground-based observations that would provide information about all the stars in its detector’s field of view. The SCP, a project commissioned to the Harvard-Smithsonian Center for Astrophysics (led by Dr. D. Latham), realized the solution to this need by providing colors through copies of the filters used for the Sloan survey (plus an additional “metallicity” filter). “SCP objects” are defined for which the SCP_ID field is listed; its value is the 2MASS identifier (TMID). For an object to be an SCP object it must have 2MASS JHK colors. However, the SCP program succeeded in observing all “SCP objects” in at least one of the 4 ground-based griz filters of the Sloan photometric system. Thus, in practical terms SCP stars are those that have been observed by the 2MASS project and through at least one of the Sloan filters. Some 98% of KIC objects on the Kepler detectors have been observed through one or more of the Sloan filters.
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