QSO B0839+187 - Misplaced Pages

Quasar in the constellation Cancer

QSO B0839+187
Observation data (Epoch J2000)
Constellation	Cancer
Right ascension	08 42 05.0942
Declination	+18° 35′ 40.991″
Redshift	1.27
Distance	8.4 billion light-years (Light travel time)
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

QSO B0839+187 (PKS 0839+187) is a quasar 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.

References

^ Simbad
^ "NASA/IPAC Extragalactic Database". Results for 0839+1846. Retrieved 2010-04-20.
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.
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.
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.

Bayer	α (Acubens) β (Tarf) γ (Asellus Borealis) δ (Asellus Australis) ε (Meleph) ζ (Tegmine) ζ η θ ι κ λ (Piautos) μ μ ν ξ (Nahn) ο ο π π ρ (Copernicus) ρ σ σ σ τ υ υ φ φ χ ψ ψ ω ω
Flamsteed	1 3 5 7 8 11 12 15 20 (d) 21 24 25 (d) 27 28 (CX) 29 34 35 36 (c) 37 38 39 40 42 44 45 (A) 46 49 (b) 50 (A) 53 54 57 60 61 66 67 68 70 71 75 78 79 80 83
Variable	R X RS VZ AZ DX EI HM
HD	72945 72946 73534 (Gakyid) 79498
Other	GJ 3470 (Kaewkosin) HIP 41378 K2-187 LHS 2090 Pr0211 WD J0914+1914 YBP 1194

Exoplanets	55 Cancri b c d e f β Cancri b GJ 3470 b HD 73534 b HIP 41378 b c d e f Pr0201 b

Star clusters	Beehive Cluster Messier 67

Nebulae	Abell 30 Abell 31

NGC	2503 2535 2536 2608 2623 2648 2775 2801 2803 2804 2812
Other	3C 191 3C 212 3C 215 DLA0817g IC 2431 OJ 287 QSO B0839+187 UGC 4457 4C +29.30 SDSS J0849+1114

Galaxy clusters	Abell 671 Musket Ball Cluster