PKS 2000−330

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]

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 (present)[2]
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

Distance measurements

The "distance" of a far away galaxy depends on the distance measurement used. 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

• List of the most distant astronomical objects