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Celestial Object Catalogue DR16
Data Science and Analytics
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About
This dataset contains a collection of astronomical object data from the Sloan Digital Sky Survey (SDSS) DR16. It comprises both photometric and spectral measurements for a variety of celestial objects, including galaxies, stars, and quasars. The SDSS has meticulously mapped a third of the sky, creating detailed three-dimensional representations of the Universe and collecting spectra for over three million astronomical objects. This dataset offers a glimpse into this extensive survey, enabling exploration and analysis of these diverse cosmic entities.
Columns
The dataset features 18 variables, consisting of 16 double-precision variables and one additional character variable named 'class'. The 'class' variable identifies the object type (galaxy, star, or quasar) and can be predicted from the other 16 variables.
- objid: Object Identifier
- ra: J2000 Right Ascension (r-band), a celestial coordinate
- dec: J2000 Declination (r-band), a celestial coordinate
- u: Better of deV/Exp magnitude fit (u-band)
- g: Better of deV/Exp magnitude fit (g-band)
- r: Better of deV/Exp magnitude fit (r-band)
- i: Better of deV/Exp magnitude fit (i-band)
- z: Better of deV/Exp magnitude fit (z-band)
- run: Run Number, which identifies the specific scan.
- rerun: Rerun Number, specifying how the image was processed.
- camcol: Camera column, a number from 1 to 6, identifying the scanline within the run.
- field: Field number, a part of the entire image corresponding to 2048 by 1489 pixels. The field number typically starts at 11 and can go up to 800.
- specobjid: Object Identifier related to spectral data.
- class: Object classification, identifying an object as a galaxy (GALAXY), star (STAR), or quasar (QSO).
- redshift: Final Redshift value.
- plate: Plate number.
- mjd: Modified Julian Date (MJD) of observation.
- fiberid: Fiber ID.
Distribution
The dataset is typically provided as a CSV (Comma Separated Values) file, with a sample file named
Skyserver_12_30_2019 4_49_58 PM.csv having a size of 15.96 MB. It contains 18 columns as detailed above. This sample dataset includes 100,000 records, with all columns showing 100% validity and no missing or mismatched entries for these records.Usage
This dataset is ideal for various applications within astronomy and data science, including:
- Classification tasks: Predicting whether an astronomical object is a galaxy, star, or quasar.
- Exploratory Data Analysis: Understanding the properties and relationships between different celestial objects.
- Deep Learning: Developing advanced models for object recognition and classification in astronomical images.
- Astronomical Research: Contributing to the understanding and exploration of the Universe, including the creation of three-dimensional maps of celestial bodies.
Coverage
The data originates from the Sloan Digital Sky Survey's DR16 server, which has conducted deep multi-colour imaging of one-third of the sky. The observations span a time range, with Modified Julian Dates (MJD) from 51608 to 58543, indicating a survey period from approximately 2000 to 2019. The dataset specifically focuses on categorising and characterising galaxies, stars, and quasars. The survey is expected to be updated annually.
License
Creative Commons Attribution-ShareAlike 4.0 International (CC BY-SA 4.0) License.
Who Can Use It
This dataset is suitable for a wide range of users, including:
- Astronomers and astrophysicists: For research into celestial objects and their properties.
- Data scientists and machine learning engineers: For building and testing classification models for astronomical data.
- Students and educators: As a resource for learning about astronomy, data analysis, and machine learning applications in scientific fields.
- Developers: For creating applications that utilise astronomical object data.
Dataset Name Suggestions
- Sloan Digital Sky Survey DR16
- SDSS DR16 Astronomical Objects
- Galaxies Stars Quasars Classification
- Celestial Object Catalogue DR16
Attributes
Original Data Source: Celestial Object Catalogue DR16
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