File:Tycho catalogue skymap shifted by 180 degrees.png

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English: This is a high-resolution version of the skymap. The threshold magnitude is 5.0 so the Milky Way is very bright and bright stars are large.

The skymap shows stars from the Tycho and Hipparcos star catalogs, provided by the ESO/ECF generic catalog server. The map is plotted in plate carrée projection (Cylindrical-Equidistant) using celestial coordinates making them suitable for mapping onto spheres in many popular animation programs.

The stars are plotted as gaussian point-spread functions (PSF) so the size and amplitude of the stars corresponds to their relative intensity. The stars are also elongated in Right Ascension (celestial longitude) based on declination (celestial latitude) so stars in the polar regions will still be round when projected on a sphere. Stars fainter than the threshold magnitude, usually selected as 5th magnitude, have their magnitude-intensity curve adjusted so they appear brighter than they really are. This makes the band of the Milky Way more visible.

About 2.4 million stars are plotted, but many may be below the pixel intensity resolution.
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Source

http://svs.gsfc.nasa.gov/goto?3572 (TIFF image)

Both the image and the description are from the page above; more details available there.
Author

NASA/Goddard Space Flight Center

Scientific Visualization Studio

Licensing[edit]

Public domain This file is in the public domain in the United States because it was solely created by NASA. NASA copyright policy states that "NASA material is not protected by copyright unless noted". (See Template:PD-USGov, NASA copyright policy page or JPL Image Use Policy.)
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current23:47, 24 January 2019Thumbnail for version as of 23:47, 24 January 20194,096 × 2,048 (32.05 MB)Exoplanetaryscience (talk | contribs)User created page with UploadWizard

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