Skip all navigation and jump to content Jump to site navigation Jump to section navigation.
NASA Logo - Goddard Space Flight Center + Visit NASA.gov
HOME PROJECTS RESOURCES SEARCH MAP

+ Advanced Search
Home
Home
View Most Recently Released Imagery
View Gallery of Imagery: A topical collection of SVS Imagery
Search Imagery by the keywords assigned to it
Search Imagery by the instruments that supplied data for a visualization product
Search Imagery by the series of visualizations that have been produced
Search Imagery by the scientist providing the data used in a visualization product
Search Imagery by the animator that created the product
Search Imagery by the identification number assigned to the visualization product
See other search options





  + RSS Feeds
  + Podcasts
blank image
Previous Animation Number   Next Animation Number
The Tycho Catalog Skymap

This image set is a skymap of stars from the Tycho and Hipparcos star catalogs. The maps are 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. Stellar colors are assigned based on B and V magnitudes (B and V are stellar magnitudes measured through different filters). If Tycho B and V magnitudes are unavailable, Johnson B and V magnitudes are used instead. From these, an effective stellar temperature is derived using the algorithms described in Flower (ApJ 469, 355 1996). Corrections were noted from Siobahn Morgan (UNI). The effective temperature was then converted to CIE tristimulus X,Y,Z triples assuming a black-body emission distribution. The X,Y,Z values are then converted to red-green-blue color pixels. About 2.4 million stars are plotted, but many may be below the pixel intensity resolution. The three most conspicuously missing objects on these maps are the Andromeda galaxy (M31) and the two Magellanic Clouds. [The images in this visualization were updated August 28, 2007 to fix a bug in the star generation algorithm.]

This skymap has been superseded by #3572, The Tycho Catalog Skymap - Version 2.0.

Share: Share via E-mail E-mail   Share on TwitterTwitter

This movie is a sample tour of the skymap.  It starts looking at the North Celestial Pole (the Little Dipper is visible).  We then make short trips to the Big Dipper, the Summer Triangle (Cygnus, Lyra, and Aquila), the Orion and Taurus region, southward to Canis Major, and over to Scorpius and Saggitarius.  The movie ends pointed at the South Celestial Pole (the Southern Cross is visible to the right).    This movie is a sample tour of the skymap. It starts looking at the North Celestial Pole (the Little Dipper is visible). We then make short trips to the Big Dipper, the Summer Triangle (Cygnus, Lyra, and Aquila), the Orion and Taurus region, southward to Canis Major, and over to Scorpius and Saggitarius. The movie ends pointed at the South Celestial Pole (the Southern Cross is visible to the right).
Duration: 1.1 minutes
Available formats:
  1280x720   Frames
  1280x720   MPEG-2   109 MB
  640x360     MPEG-4   78 MB
  1280x720   MPEG-4   237 MB
  512x288     MPEG-1   25 MB
  320x180     MPEG-1   7 MB
  320x180     X-FLV       1 MB
  1280x720   JPEG         206 KB
  320x180     PNG           79 KB
How to play our movies


A low-resolution version of the skymap.  The threshold magnitude is 5.0 so the Milky Way is very bright and bright stars are large.    A low-resolution version of the skymap. The threshold magnitude is 5.0 so the Milky Way is very bright and bright stars are large.

Available formats:
  4096 x 2048     TIFF     14 MB


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 the map above.    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 the map above.

Available formats:
  4096 x 2048     TIFF     12 MB


A low-resolution version of the skymap.  The threshold magnitude is 3.0 so the Milky Way is very faint.    A low-resolution version of the skymap. The threshold magnitude is 3.0 so the Milky Way is very faint.

Available formats:
  4096 x 2048     TIFF     10 MB


These are high-resolution versions of the skymaps.  They are best suited for use when you need a small field-of-view and don't want bright stars to overpower the image.    These are high-resolution versions of the skymaps. They are best suited for use when you need a small field-of-view and don't want bright stars to overpower the image.

Available formats:
  8192 x 4096     TIFF     31 MB
  16384 x 8192   TIFF     47 MB

Short URL to This Page:http://svs.gsfc.nasa.gov/goto?3442
Animation Number:3442
Completed:2007-08-14
Animator:Tom Bridgman (GST) (Lead)
Platforms/Sensors/Data Sets:Hipparcos/Telescope/Tycho 2 Catalogue (November 1989 - March 1993)
 Hipparcos/Telescope/Hipparcos Catalogue (November 1989 - March 1993)
Series:Astrophysics Stills
Please give credit for this item to:
NASA/Goddard Space Flight Center Scientific Visualization Studio
 
Keywords:
SVS >> HDTV
SVS >> Milky Way
SVS >> Astrophysics
SVS >> Universe
SVS >> Sky Map
SVS >> Star
 
 


Back to Top
Many of our multimedia items use the GCMD keywords. These keywords can be found on the Internet with the following citation:
Olsen, L.M., G. Major, K. Shein, J. Scialdone, S. Ritz, T. Stevens, M. Morahan, A. Aleman, R. Vogel, S. Leicester, H. Weir, M. Meaux, S. Grebas, C.Solomon, M. Holland, T. Northcutt, R. A. Restrepo, R. Bilodeau, 2013. NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version 8.0.0.0.0

USA.gov logo - the U.S. Government's official Web portal. + Privacy Policy and Important Notices
+ Reproduction Guidelines
NASA NASA Official:
SVS Contact:
Curator: