Astrophysics (Index)About

parsec

(pc)
(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.

Equivalent distances:

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 apparent movement is half that, then the star is two parsecs distant and if a third of that, three parsecs distant.


(distance,unit,astronomy)
Further reading:
http://en.wikipedia.org/wiki/Parsec

Referenced by pages:
absolute magnitude (M)
astronomical quantities
Atlas 3D
astronomical unit (AU)
AU Microscopii (AU Mic)
baryon acoustic oscillations (BAO)
Betelgeuse
Bok globule
bulge
Bullet Cluster
Circinus Galaxy (ESO 97-G13)
dispersion measure (DM)
distance modulus (μ)
double star
DQ Tau
dwarf galaxy
F-type star (F)
55 Cancri e (55 Cnc e)
filament
final parsec problem
galactic bulge
galactic center
galaxy
galaxy power spectrum
GG Tau
GJ 1132 b
GJ 1214 b
Gliese 436 b (GJ 436 b)
Gliese Catalogue of Nearby Stars (Gl)
Gould's Belt
GRO J1655-40
GZK limit
Herbig-Haro object (HH)
HII region (HII)
HI supershell
Hubble constant (H0)
hypervelocity star (HVS)
Kennicutt-Schmidt law
Kepler-1625b
Kepler-16b
Kepler-186f
Kepler-452b
Lambda-CDM model (ΛCDM)
Las Campanas Redshift Survey (LCRS)
LHS 3844 b
Local Sheet
Local Void
large quasar group (LQG)
light-year (ly)
magnitude
molecular cloud
NANOGrav
near-Earth supernova
Nessie
OGLE-2005-BLG-3290Lb
Orion Nebula Cluster (ONC)
Oort constants
Orion Molecular Cloud Complex
parallax
PAWS
pulsar timing array (PTA)
redshift (z)
radio galaxy (RG)
Rho Ophiuchi Cloud Complex
Scholz's Star
shell
Smith Cloud
solar circle
solar neighborhood
standard ruler
stellar distance determination
survey depth
T association
Taurus-Auriga Complex
Teegarden's Star
3C 273
Taurus Molecular Cloud 1 (TMC-1)
Trapezium Cluster
Triangulum II (Tri II)
T Tauri
TW Hydrae association (TWA)
Ursa Major II Dwarf
W51
WASP-33b
WASP-67b
Wide-field Multi-object Spectrograph (WFMOS)
Zwicky 3146 (Zw 3146)

Index