File:Tycho catalog skymap v2.0 (threshold magnitude 4.0, low-res).png
Original file (4,096 × 2,048 pixels, file size: 14.91 MB, MIME type: image/png)
Captions
Summary
[edit]DescriptionTycho catalog skymap v2.0 (threshold magnitude 4.0, low-res).png |
English: This is a low-resolution version of the skymap. The threshold magnitude is 4.0 so the Milky Way is fainter and bright stars are smaller than on the 3.0 magnitude map.
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 | (data collected between November 1989 and March 1993) |
Source |
|
Author |
NASA/Goddard Space Flight Center |
Other versions |
|
Licensing
[edit]Public domainPublic domainfalsefalse |
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:
|
File history
Click on a date/time to view the file as it appeared at that time.
Date/Time | Thumbnail | Dimensions | User | Comment | |
---|---|---|---|---|---|
current | 00:15, 10 March 2009 | 4,096 × 2,048 (14.91 MB) | Tryphon (talk | contribs) | == Summary == {{Information |Description={{en|1=This is a low-resolution version of the skymap. The threshold magnitude is 4.0 so the Milky Way is fainter and bright stars are smaller than on the [[:File:Tycho |
You cannot overwrite this file.
File usage on Commons
The following 2 pages use this file: