How many stars ... -- Sky Guide: Credits

This Sky Guide has used the following references for the various types of objects:

Inspiration, still the standard for formatting the universe:

Burnham's Celestial Handbook
    Robert Burnham, Jr.
    Celestial Handbook Publications, Flagstaff AZ (1966)
    Dover Publications Inc (1978)
    
    "May there always be starlight on the path."

Star positions, magnitudes, motions:

The Hipparcos and Tycho Catalogues
    ESA 1997
    ESA, 1997, The Hipparcos Catalogue, ESA SP-1200
    ESA, 1997, The Tycho Catalogue, ESA SP-1200

Multiple stars:

This research has made use of the Washington Double Star Catalog 
maintained at the U.S. Naval Observatory.
- Brian D. Mason, Gary L. Wycoff, and William I. Hartkopf

Variable stars:

Combined General Catalog of Variable Stars (GCVS4.2, 2004 Ed.)
     Samus N.N., Durlevich O.V., et al.
    (Institute of Astronomy of Russian Academy of Sciences and Sternberg
     State Astronomical Institute of the Moscow State University (2004))

NGC and IC objects:

NGC 2000.0, The Complete New General Catalogue and Index Catalogue
of Nebulae and Star Clusters by J.L.E. Dreyer
     Sinnott, R.W. (edited by)
     Sky Publishing Corporation and Cambridge University Press (1988)

Thumbnail images - data source:

Digitized Sky Survey (selected images are from DSS2 RED plates)

Provenance
    Data taken by Royal Observatory Edinburgh(Southern Sky) or Oschin Schmidt Telescope 
    on Palomar Mountain(Northern Sky). Compression and distribution by Space Telescope 
    Science Institute. 
Copyright
    Space Telescope Science Institute, AAO, UK-PPARC, ROE, National Geographic Society, 
    and California Institute of Technology

Thumbnail images - tools:

SkyView was developed and is maintained under NASA ADP Grant NAS5-32068 with P.I.  
Thomas A. McGlynn under the auspices of the High Energy Astrophysics Science Archive 
Research Center (HEASARC) at the GSFC Laboratory for High Energy Astrophysics.

We gratefully acknowledge the support of NASA and the contributors of SkyView data surveys. 

Correlation, exploration & multiple image processing:

This research has made extensive use of Aladin, a virtual observatory tool of epic scope.
Copyright  ULP/CNRS

Data servers:

This research has made extensive use of the Vizier and SIMBAD data servers.