File:Tycho catalogue skymap shifted by 180 degrees.png

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Summary

Description	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.
Date	9 January 2009
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

	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.)
	Warnings: Use of NASA logos, insignia and emblems is restricted per U.S. law 14 CFR 1221. The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain. Materials based on Hubble Space Telescope data may be copyrighted if they are not explicitly produced by the STScI.[1] See also {{PD-Hubble}} and {{Cc-Hubble}}. The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2] Images featured on the Astronomy Picture of the Day (APOD) web site may be copyrighted. [3] The National Space Science Data Center (NSSDC) site has been known to host copyrighted content. Its photo gallery FAQ states that all of the images in the photo gallery are in the public domain "Unless otherwise noted."

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	23:47, 24 January 2019		4,096 × 2,048 (32.05 MB)	Exoplanetaryscience	User created page with UploadWizard

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PNG file comment	Created with GIMP
Horizontal resolution	28.35 dpc
Vertical resolution	28.35 dpc
File change date and time	23:43, 24 January 2019

File:Tycho catalogue skymap shifted by 180 degrees.png

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9 January 2009

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