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https://github.com/sayamalt/stellar-classification---sloan-digital-sky-survey-17

Successfully established a machine learning model which can predict an appropriate stellar class, on the basis of a distinct set of spectral characteristics, to a substantially high level of accuracy.
https://github.com/sayamalt/stellar-classification---sloan-digital-sky-survey-17

cross-validation data-preprocessing data-visualization exploratory-data-analysis feature-engineering feature-scaling imbalanced-learning model-deployment model-evaluation model-training multiclass-classification supervised-machine-learning

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Successfully established a machine learning model which can predict an appropriate stellar class, on the basis of a distinct set of spectral characteristics, to a substantially high level of accuracy.

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# Stellar-Classification : Sloan-Digital-Sky-Survey-17



![Stars and Galaxies](https://media2.giphy.com/media/OYfQ5c7FPeBxe/giphy.gif)

![Stellar Classification](https://scitechdaily.com/images/Primordial-Stellar-Stream-Near-Milky-Way-scaled.jpg)

![Stellar](https://s3.envato.com/files/196219035/stellar_space_preview.jpg)



## Deployed Web Application



Link: https://stellar-classification.herokuapp.com/



## Context 



In astronomy, stellar classification is the classification of stars based on their spectral characteristics. The classification scheme of galaxies, quasars, and stars is one of the most fundamental in astronomy. The early cataloguing of stars and their distribution in the sky has led to the understanding that they make up our own galaxy and, following the distinction that Andromeda was a separate galaxy to our own, numerous galaxies began to be surveyed as more powerful telescopes were built. This datasat aims to classify stars, galaxies, and quasars based on their spectral characteristics.



  

    Stellar Object

    Description

  

  

    Star

    A star is an astronomical object comprising a luminous spheroid of plasma held together by its gravity.

  

  

    Quasar

    A quasar (also known as a quasi-stellar object, abbreviated QSO) is an extremely luminous active galactic nucleus (AGN), powered by a supermassive black hole, with mass ranging from millions to tens of billions of solar masses, surrounded by a gaseous accretion disc.The term quasar originated as a contraction of "quasi-stellar [star-like] radio source"—because quasars were first identified during the 1950s as sources of radio-wave emission of unknown physical origin—and when identified in photographic images at visible wavelengths, they resembled faint, star-like points of light.

  

  

    Galaxy

    A galaxy is a gravitationally bound system of stars, stellar remnants, interstellar gas, dust, and dark matter.

  



References:



    

      
  1. "star." Oxford Dictionary of English 2e, Oxford University Press, 2003. 
    2. 

      
  2. "Galaxy" (İngilizce). Encyclopædia Britannica.
    3. 

      
  3. Hupp, E. (21 Ağustos 2006). "NASA Finds Direct Proof of Dark Matter"
    4. 

      
  4. Wu, Xue-Bing; Wang, Feige; Fan, Xiaohui; Yi, Weimin; Zuo, Wenwen; Bian, Fuyan; Jiang, Linhua; McGreer, Ian D.; Wang, Ran; Yang, Jinyi; Yang, Qian (Şubat 2015). "An ultraluminous quasar with a twelve-billion-solar-mass black hole at redshift 6.30". Nature (İngilizce). 518 (7540): 512-515. doi:10.1038/nature14241. ISSN 1476-4687
    5. 

      
  5. Frank, Juhan; King, Andrew; Raine, Derek J. (1 Ocak 2002). Accretion Power in Astrophysics: Third Edition
    6. 




## Content



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.



  

    Feature

    Description

  

  

    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

  

  

    rerun_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

  



## Acknowledgements



The data released by the SDSS is under public domain. Its taken from the current data release RD17.



    More information about the license: http://www.sdss.org/science/image-gallery/



SDSS Publications:



    Abdurro’uf et al., The Seventeenth data release of the Sloan Digital Sky Surveys: Complete Release of MaNGA, MaStar and APOGEE-2 DATA (Abdurro’uf et al. submitted to ApJS) [arXiv:2112.02026]