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

References

1. Simbad
2. "NASA/IPAC Extragalactic Database". Results for 0839+1846. Retrieved 2010-04-20.
3. Fomalont, Ed & Kopeikin, Sergei (2003). "The measurement of the light deflection from Jupiter: Experimental results". The Astrophysical Journal. 598 (1): 704–711. arXiv:astro-ph/0302294. Bibcode:2003ApJ...598..704F. doi:10.1086/378785. S2CID 14002701.
4. Asada, Hideki (2002). "Light cone effect and the Shapiro time delay". The Astrophysical Journal Letters. 574 (1): L69–L70. arXiv:astro-ph/0206266. Bibcode:2002ApJ...574L..69A. doi:10.1086/342369. S2CID 14589086.
5. Stuart Samuel (2003). "On the Speed of Gravity and the v/c Corrections to the Shapiro Time Delay". Physical Review Letters. 90 (23): 231101. arXiv:astro-ph/0304006. Bibcode:2003PhRvL..90w1101S. doi:10.1103/PhysRevLett.90.231101. PMID 12857246. S2CID 15905017.