Gaia DR2
ImageGBPRPBP-RPparallax (mas)pmra (mas)pmdec (mas)PMSIGAENAEN sigSource ID
116.848 16.943 16.368 0.576 0.064 ±0.077 0.090 ±0.101 -0.119 ±0.110 1.404 0.249 2.247 1045166002126206720
217.138 17.307 16.736 0.571 0.048 ±0.077 0.131 ±0.103 -0.110 ±0.122 1.558 0.000 0.000 1045166002126206848
Gaia DR1
ImageGAENAEN sigSource ID
116.742 0.467 5.472 1045165997830581120
217.112 0.364 2.410 1045165997830581248
NameRADECbW1-W2z qsoz lenssep.NGaia densityGDR1 countGDR2 countNEDSDSS DR14PanSTARRSDECaLSGaia cutoutWISE modelWISEFIRSTNVSSSUMSSGaiaCFHT cutoutCFHT searchDiscovery
Q0957+561150.3366555.8979148.1.2861.4130.35626.172536222NED LinkSDSS DR14 LinkPanSTARRS LinkDECaLSGDR2 cutoutWISE modelWISEFIRST
GaiaCFHT cutoutCFHT searchWalsh et al. 1979

Relevant Publications

May 1979: 0957+561 A, B: twin quasistellar objects or gravitational lens?, Walsh, Carswell & Weymann 1979

Oct 1980: The double quasar Q0957+561 A, B: a gravitational lens image formed by a galaxy at z=0.39., Young et al. 1980

Dec 1980: The lens galaxy of the twin QSO 0957+561, Stockton 1980

Mar 1981: Q0957+561 : detrailed models of the gravitational lens effect., Young et al. 1981

Mar 1981: Q0957+561 : effects of random stars on the gravitational lens., Young 1981

Apr 1982: The nature of the light variations in the double QSO Q0957+561., Keel 1982

Jun 1983: VLBI observations of the gravitational-lens images of Q0957 + 561, Gorenstein et al. 1983

Feb 1984: CCD brightness monitoring of the Twin QSO 0957+561., Schild & Weekes 1984

Feb 1985: On model-dependent bounds on H 0 from gravitational images : application to Q 0957+561 A, B., Falco, Gorenstein & Shapiro 1985

Jun 1985: The gravitationally lensed quasar 0957+561 : VLA observations and mass models., Greenfield, Roberts & Burke 1985

Dec 1990: The Time Delay in the Twin QSO Q0957+561, Schild 1990

Mar 1991: An estimate of the Hubble constant from the gravitational lensing of quasar Q0957+561, Rhee 1991

Mar 1991: Microlensing in the Q0957+561 Gravitational Mirage, Schild & Smith 1991

Jan 1992: The Radio Time Delay in the Double Quasar 0957+561, Lehar et al. 1992

Jun 1993: Discovery of a New Component in the Gravitationally Lensed Quasar 0957+561, Jones et al. 1993

Mar 1995: The Gravitational Lens System Q0957+561 in the Ultraviolet, Dolan et al. 1995

May 1995: Twin QSO Q0957+561 Time Delay Dataset, Schild & Thomson 1995

Jun 1996: Microlensing Variability of the Gravitationally Lensed Quasar Q0957+561 A,B, Schild 1996

Jan 1997: The Q0957+561 Time Delay From Optical Data, Schild & Thomson 1997

Mar 1997: The Dust-to-Gas Ratio in the Damped Lyα Clouds toward the Gravitationally Lensed QSO 0957+561, Zuo et al. 1997

Jul 1997: An Estimate of H0 from Keck Spectroscopy of the Gravitational Lens System 0957+561, Falco et al. 1997

Jul 1997: Improved Parameters and New Lensed Features for Q0957+561 from WFPC2 Imaging, Bernstein et al. 1997

Jul 1998: Limits on MACHOs from microlensing in the double quasar Q0957+561, Schmidt & Wambsganss 1998

Sep 1998: X-Ray Detection of the Primary Lens Galaxy Cluster of the Gravitational Lens System Q0957+561, Chartas et al. 1998

Jun 1999: Precision Photometry for Q0957+561 Images A and B, Colley & Schild 1999

Jul 1999: Source Size Limitation from Variabilities of a Lensed Quasar, Yonehara 1999

Aug 1999: A Reassessment of the Data and Models of the Gravitational Lens Q0957+561, Barkana et al. 1999

Aug 2000: Ultraviolet Spectral Variability and the Lyα Forest in the Lensed Quasar Q0957+561, Dolan et al. 2000

Oct 2000: The Host Galaxy of the Lensed Quasar Q0957+561, Keeton et al. 2000

Jan 2002: Constraining H0 from Chandra Observations of Q0957+561, Chartas et al. 2002

May 2003: New aperture photometry of QSO 0957+561; application to time delay and microlensing, Ovaldsen et al. 2003

Jul 2003: Ultraviolet Structure in the Lensed QSO 0957+561, Hutchings 2003

Dec 2003: A gravitationally lensed quasar with quadruple images separated by 14.62arcseconds, Inada et al. 2003

Aug 2004: Anomalous fluctuations in observations of Q0957+561 A,B: Smoking gun of a cosmic string?, Schild et al. 2004

Feb 2005: The influence of gravitational lensing on the spectra of lensed quasi-stellar objects, Popović & Chartas 2005

Mar 2005: Q0957+561 revised: CO emission from a disk at z = 1.4, Krips et al. 2005

Jul 2006: Observations Supporting the Existence of an Intrinsic Magnetic Moment inside the Central Compact Object within the Quasar Q0957+561, Schild, Leiter & Robertson 2006

Mar 2008: The Central Component of Gravitational Lens Q0957+561, Haarsma et al. 2008

Dec 2008: New two-colour light curves of Q0957+561: time delays and the origin of intrinsic variations, Shalyapin et al. 2008

Dec 2008: Structure function of the UV variability of Q0957+561, Goicoechea et al. 2008

Jun 2009: Improved Constraints on the Gravitational Lens Q0957+561. I. Weak Lensing, Nakajima et al. 2009

Mar 2010: Improved Constraints on the Gravitational Lens Q0957+561. II. Strong Lensing, Fadely et al. 2010

Jan 2012: A New Microlensing Event in the Doubly Imaged Quasar Q 0957+561, Hainline et al. 2012

Apr 2012: A 5.5-year robotic optical monitoring of Q0957+561: substructure in a non-local cD galaxy, Shalyapin, Goicoechea & Gil-Merino 2012

Apr 2012: Multi-wave Monitoring of the Gravitational Lensed Quasar Q0957+561, Shalyapin, Goicoechea & Gil-Merino 2012

Aug 2012: Measuring Microlensing Using Spectra of Multiply Lensed Quasars, Motta et al. 2012

Dec 2016: A partially occulting MACHO-microlensing event in the Twin Quasar Q0957+561, Nieuwenhuizen 2016

Jan 2018: Infrared Microlensing Analysis of the Gravitationally Lensed Quasar Q0957+561, Sorenson et al. 2018

May 2018: A gravitationally lensed quasar discovered in OGLE, Kostrzewa-Rutkowska et al. 2018

Apr 2019: Revealing the non-linear behaviour of the lensed quasar Q0957+561, Belete et al. 2019