Skyview:  Catalogs of images and data.  Descriptions of a few are:

• VISIBLE - Colors to help with temperature determination of stars and galaxies: DSS Blue, Red, Infrared
• INFRARED - Dust in nebulae, stars, galaxies: IRAS Sky Survey Atlas 60 and 100 micron - where (lambda)(T) = 2898 cm K, where T is the temperature of the dust
• INFRARED - Young Stars: Two MIcron All-Sky Survey (K Band)
• RADIO - Neutral hydrogen: Bonn 1420 Survey and HI All SKy Continuum Survey (same frequency as Smiley's receiver)
• RADIO - Continuum emission like synchrotron: 4850 MHz Survey/GB6
• RADIO - Molecular emission: CO Galactic Plane Survey where CO is carbon monoxide

Click here for more complete descriptions of the Surveys in SkyView

THE HERTZSPRUNG RUSSELL DIAGRAM: Absolute Magnitudes and Luminosities:

Click here to link to the HR Diagram

Simbad: find information about individual sources

NED:  NASA/IPAC Extragalactic Database

ADS Abstracts: Find astronomy papers

AAVSO: Variable star data

Local Sidereal Time:  for PARI with Longtitude = 82 degrees 52 arcminutes 30 arcseconds

Convert Right Ascension and Declination to Galactic Coordinates

Other coordinate transformations

Telescope Scale = 206265/(focal length)

Telescope Spatial Resolution = (1.22)(wavelength of observation)/(diameter of aperture)

Click here for a list of UBVRI Standard Stars