Some useful astronomical links

NSSDC

The National Space Science Data Center (NSSDC) provides access and distributes a wide variety of data obtained with several NASA missions. Not only astronomical images and spectra are included, but also space plasma data and Earth and space photographs. It is one of the largest astronomical archives.


LEDA

The Lyon-Meudon Extragalactic Data Base, LEDA (telnet leda.univ lyon1.fr; login: leda) includes on-line versions of the Principal Galaxies Catalog (more than 73,000 objects), the Third Reference Catalog of Bright Galaxies (more than 23,000 objects), HI catalogs and the Catalog of individual optical velocity measurements (OVC). Around 70 parameters are included for each of the more then 95,000 objects. Among them, the position, flux at different wavelength and colors, redshift or radial velocity and surface brightness. The references for all listed measurements are also included. All the parameters are listed in a homogeneous way, calculations are made only from accepted models.

Images of many of the galaxies can be retrieved as well as a map of the region listing all the objects with their PGC number. The output figures can be drawn with or without the stars in the field.

If the list of objects is long, a query can be made by e-mail to ledamail@lmc.univ-lyon1.fr


Data

The very useful Handbook of Space Astronomy and Astrophysics by M.V. Zombeck is available on-line thanks to Cambridge University Press.
(http://adswww.harvard.edu/books/hsaa/idx.html).

Other useful information on astrophysical objects is stored at the CDS web (http://cdsweb.u-strasbg.fr/data-online.html)
Other images, lists and catalogs


Planetary Information

There are several "tours" of the solar system. The most popular ones are:

• NSSDC http://nssdc.gsfc.nasa.gov/imgcat/
  
• SEDS http://www.seds.org/nineplanets/nineplanets/nineplanets.html
  
• Planetary Data Systems http://pds.jpl.nasa.gov/planets
  
• JPL http://photojournal.jpl.nasa.gov