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.

Equivalence:

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.


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

Referenced by:
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)
distance modulus (u)
double star
DQ Tau
dwarf galaxy
F-type star (F)
filament
final parsec problem
galactic bulge
galactic center
galaxy
galaxy power spectrum
GG Tau
GJ 1132 b
GJ 1214 b
Gliese Catalogue of Nearby Stars (Gl)
Gould's Belt
GRO J1655-40
GZK limit
Herbig-Haro object (HH)
HII region (HII)
Hubble constant (H0)
hypervelocity star (HVS)
Kennicutt-Schmidt law
Lambda-CDM model (ΛCDM)
Local Sheet
Local Void
light-year (ly)
magnitude
molecular cloud
NANOGrav
Nessie
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
Smith Cloud
solar circle
stellar distance determination
survey depth
Taurus-Auriga Complex
3C 273
Taurus Molecular Cloud 1 (TMC-1)
Trapezium Cluster
Triangulum II (Tri II)
T Tauri
TW Hydrae association (TWA)
Ursa Major II Dwarf
Wide-field Multi-object Spectrograph (WFMOS)

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