Absolute magnitude is a measure of the luminosity of a celestial object, on a logarithmic astronomical magnitude scale.
Astronomy (from ἀστρονομία) is a natural science that studies celestial objects and phenomena.
The distance modulus is a way of expressing distances that is often used in astronomy.
In astronomy, the distance to a visual binary star may be estimated from the masses of its two components, the size of their orbit, and the period of their orbit about one another.
The Sloan Digital Sky Survey or SDSS is a major multi-spectral imaging and spectroscopic redshift survey using a dedicated 2.5-m wide-angle optical telescope at Apache Point Observatory in New Mexico, United States.
Spectroscopic parallax is an astronomical method for measuring the distances to stars.
Stellar parallax is the apparent shift of position of any nearby star (or other object) against the background of distant objects.
The Virgo Stellar Stream, also known as Virgo Overdensity, is the proposed name for a stellar stream in the constellation of Virgo which was discovered in 2005.