QSO B0839+187

QSO B0839+187 (PKS 0839+187) is a quasar^[1] that was used for a VLBI experiment conducted by Edward Fomalont and Sergei Kopeikin in September 2002. They claimed to measure the speed of gravity, but this is disputed.^[3][4][5]

QSO B0839+187
Observation data (Epoch J2000)
Constellation	Cancer
Right ascension	08h 42m 05.0942s
Declination	+18° 35′ 40.991″
Redshift	1.27[1][2]
Distance	8.4 billion light-years (Light travel time)[2]
Type	Rad
Apparent magnitude (V)	16.36
Other designations
LEDA 2825583, PKS J0842+1835, PKS 0839+187, 2MASS J08420509+1835411, QSO B0839+1846
See also: Quasar, List of quasars