PKS 2000-330

From Wikipedia, the free encyclopedia
Jump to: navigation, search
PKS 2000-330
Hubble Legacy Archive WFPC2 image of PKS 2000-330
Observation data (Epoch J2000)
Constellation Sagittarius
Right ascension 20h 03m 24.116s[1]
Declination −32° 51′ 45.13″[1]
Redshift 3.773[2]
274,681 km/s[1]
Distance 11.7 billion light-years
(Light travel time)[2]
22.7 billion light-years
Type Quasar[1]
Apparent magnitude (V) 18.4 (SIMBAD)[1]
19.0 (NED)[2]
17.3 - 19.0[3]
Other designations
2MASS J20032410-3251452, QSO B2000-330[1]
See also: Quasar, List of quasars

PKS 2000-330 (also known as QSO B2000-330) is a quasar[1] located in the constellation Sagittarius. When identified in 1982, it was the most distant and most luminous object known.[3]

Distance measurements[edit]

The "distance" of a far away galaxy depends on what distance measurement you use. With a redshift of 3.77,[2] light from this active galaxy is estimated to have taken around 11.7 billion years to reach us.[2] But since this galaxy is receding from Earth at an estimated rate of 274,681 km/s[1] (the speed of light is 299,792 km/s), the present (co-moving) distance to this galaxy is estimated to be around 22.7 billion light-years (6947 Mpc).[2]

See also[edit]


  1. ^ a b c d e f g h "PKS 2000-330". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2010-04-28. 
  2. ^ a b c d e f g "NASA/IPAC Extragalactic Database". Results for PKS 2000-330. Retrieved 2010-04-28. 
  3. ^ a b Peterson, B. A.; Savage, A.; Jauncey, D. L.; Wright, A. E. (1982). "PKS 2000-330 - A quasi-stellar radio source with a redshift of 3.78". Astrophysical Journal. 260: L27–L29. Bibcode:1982ApJ...260L..27P. doi:10.1086/183863. 

External links[edit]

  • Wikisky image of PKS 2000-330