Astrophysics (index)about


(about 3.26 light-years)

A Parsec is the distance corresponding to a Parallax of one arcsecond, i.e., if an object shows a parallax of one arcsecond, it is one parsec from the Sun.


  • 3.261564 Light-Years (i.e., the distance light can travel in a year).
  • 3.08567758 x 1016 meters.
  • 1917312 million miles.
  • 206264.806 Astronomical Units.

If a star appears to move back and forth two arcseconds over the course of a year as the Earth moves to and from a spot 2 AU away (1 arcsecond parallax angle), the star is 1 parsec distant. If the movement is half that, then the star is twice as distant.


Referenced by:
Absolute Magnitude (M)
Astronomical Quantities
Astronomical Unit (AU)
Baryon Acoustic Oscillations (BAO)
Bok Globule
Distance Modulus (u)
DQ Tau
Dwarf Galaxy
F-Type Star (F)
Final Parsec Problem
GJ 1132 b
GJ 1214 b
Kennicutt-Schmidt Law
Molecular Cloud
Rho Ophiuchi Cloud Complex
Scholz's Star
Stellar Distance Determination
Taurus-Auriga Complex
Trapezium Cluster
Wide-Field Multi-Object Spectrograph (WFMOS)