Use for discovery:

Find the effective temperature of a star:

Find the equatorial coordinates of a star:

Find the current sky position of a star from your location:

Get a list of classes of stars:

Find the spectral classes of barium stars:

The 10 nearest stars:

Distances:

Spectral class information:

The 15 brightest stars as seen from Earth:

The constellations for the 10 brightest stars:

Distance from Earth to Sirius:

Distance in meters:

Position of Sirius:

Date qualifiers can accept an explicit DateObject or queries that evaluate to a DateObject:

Date qualifiers can also be specified using Dated:

Location qualifiers can accept an explicit GeoPosition, location-based Entity objects, or queries that evaluate to one of these:

Spectral class for the Sun:

Spectral class information in list form:

Alternate names for Sirius:

Henry Draper Memorial catalog number for Sirius:

Give the individual stars that form Alpha Centauri:

Give the name of Tau Ceti, including Greek letters:

Without special characters:

Number of available supergiants:

Brightest 10 class O stars:

Brightest 10 Wolf–Rayet stars:

Plot the right ascension and declination of the 100 brightest stars, with tooltips for their names:

The corresponding picture for the 100 nearest stars:

Rank plot of absolute magnitudes of the 100 nearest stars:

Rank plot of absolute magnitudes of the 100 brightest stars:

Distribution of basic spectral classes for the 100 brightest stars:

Distribution for the 100 nearest stars:

Rank plot of the distances to the 100 nearest stars:

Differences between successive distances:

Get the correct color and simulate lighting for a star:

The color of stars is an indication of their temperature:

The habitable zone of an exoplanet is an ambiguous concept with no agreed-upon definition. There are several ways to go about determining what you might interpret as the habitable zone. All methods have a relation to their host star.

One way of determining the habitable zone is described in Whitmire, D. and Reynolds, R. "Circumstellar Habitable Zones: Astronomical Considerations." In Doyle, L. (Ed.). Circumstellar Habitable Zones, Proceedings of the First International Conference. Travis House Publications, 1996: 117–142. This method allows you to determine an inner and outer radius of the habitable zone around a star:

Plot luminosity versus mass for nearby stars: