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Machine Learning Star Classification

Dataset used: https://www.kaggle.com/datasets/fedesoriano/stellar-classification-dataset-sdss17/data

Dataset Structure

The data consists of 100,000 observations of space taken by the SDSS (Sloan Digital Sky Survey). Every observation is described by 17 feature columns and 1 class column which identifies it to be either a star, galaxy or quasar.

  • obj_ID = Object Identifier, the unique value that identifies the object in the image catalog used by - the CAS
  • alpha = Right Ascension angle (at J2000 epoch)
  • delta = Declination angle (at J2000 epoch)
  • u = Ultraviolet filter in the photometric system
  • g = Green filter in the photometric system
  • r = Red filter in the photometric system
  • i = Near Infrared filter in the photometric system
  • z = Infrared filter in the photometric system
  • run_ID = Run Number used to identify the specific scan
  • rereun_ID = Rerun Number to specify how the image was processed
  • cam_col = Camera column to identify the scanline within the run
  • field_ID = Field number to identify each field
  • spec_obj_ID = Unique ID used for optical spectroscopic objects (this means that 2 different observations with the same spec_obj_ID must share the output class)
  • class = object class (galaxy, star or quasar object)
  • redshift = redshift value based on the increase in wavelength
  • plate = plate ID, identifies each plate in SDSS
  • MJD = Modified Julian Date, used to indicate when a given piece of SDSS data was taken
  • fiber_ID = fiber ID that identifies the fiber that pointed the light at the focal plane in each observation