Identify stars based on various catalogs they appear in. Bright stars have common names, but many stars only have catalog identifiers.
Compute the location and get properties of a star:
Specify a star using a Bayer name:
Specify a star using a catalog number:
Compare several stars:
Obtain a diverse set of properties for stars, such as luminosity, mass and radius, as well as position-based properties.
Request a property of a star:
Compute the color of a star:
Compare properties of multiple stars:
Do computations with star properties:
Generate a list of nearby stars:
Decode many different pieces of information about a star including temperature, radius and mass, as well as chemical peculiarities, which are encoded in the spectral class of a star.
Get information about a spectral class of stars:
Find the spectral class of a given star:
Generate a Hertzsprung–Russell diagram:
Determine the end state of a star:
Get information about a star with a given property:
Specify a property and luminosity class:
Investigate why some stars vary in brightness over a range of possible scales, periods and reasons.
Get information about a variable star:
Get a specified property of a variable star:
Query for properties of pulsars, which are dominated by radio‐based measurements, such as radio flux, in addition to location-based properties.
Get information about a pulsar:
Compare pulsars:
Discover the host galaxy, peak magnitude and maximum light date, which are among the properties available for supernovae.
Get information about a supernova:
Look up a property of a supernova:
Constellations are apparent patterns of stars as seen from Earth. Explore all 88 officially recognized constellations, each having a recognized boundary in the sky.
Generate a star chart for a constellation: