2022AJ....164..120F

Query : 2022AJ....164..120F

2022AJ....164..120F - Astron. J., 164, 120 (2022/October-0)

The Quadruple Image Configurations of Asymptotically Circular Gravitational Lenses.

FALOR C. and SCHECHTER P.L.

Abstract (from CDS):

The quadruple image configurations of gravitational lenses with vanishing ellipticity are examined. Even though such lenses asymptotically approach circularity, the configurations are stable if the position of the source relative to the vanishing diamond caustic is held constant. The configurations are the solutions of a quartic equation, an “asymptotically circular lens equation,” parameterized by a single complex quantity. Several alternative parameterizations are examined. Relative magnifications of the images are derived. When a nonvanishing quadrupole, in the form of an external shear (XS), is added to the singular isothermal sphere (SIS), its configurations emerge naturally as stretched and squeezed versions of the circular configurations. And as the SIS+XS model is a good first approximation for most quadruply lensed quasars, their configurations likewise have only 2 + 1 salient dimensions. The asymptotically circular configurations can easily be adapted to the problem of solar system “occultation flashes.”

Abstract Copyright: © 2022. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Gravitational lensing - Strong gravitational lensing - Caustic curve - Critical curve

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 * 28 Sgr * 18 46 20.6109922296 -22 23 31.823445372   6.961 5.366     K5III 82 0

Query : 2022AJ....164..120F

Basic data :
* 28 Sgr -- Star
Other object types: otypes_help 		* (*,BD,...), ** (**,ADS,...), MIR (WISEA,WISE), IR (IRAS,IRC), NIR (2MASS)
ICRS coord. (ep=J2000) : 		18 46 20.6109922296 -22 23 31.823445372 (Optical) [ 0.1007 0.0936 90 ] A 2020yCat.1350....0G
FK4 coord. (ep=B1950 eq=1950) : 		18 43 19.6847869424 -22 26 46.580762935 [ 0.1007 0.0936 90 ]
Gal coord. (ep=J2000) : 		012.2798719229546 -08.9408326011946 [ 0.1007 0.0936 90 ]
Proper motions mas/yr : 		28.317 -1.455 [0.099 0.069 90] A 2020yCat.1350....0G
Radial velocity / Redshift / cz : 		V(km/s) -2.7 [2] / z(~) -0.000009 [0.000007] / cz -2.70 [2.00]
   E 1953GCRV..C......0W
Parallaxes (mas): 		4.38 [0.1341] A 2020yCat.1350....0G
Spectral type: 		K5III C 1988MSS...C04....0H
Fluxes (6) :
B 6.961 [0.015] D 2000A&A...355L..27H
V 5.366 [0.009] D 2000A&A...355L..27H
G 4.714129 [0.003025] C 2020yCat.1350....0G
J 2.482 [0.270] D 2003yCat.2246....0C
H 1.717 [0.262] D 2003yCat.2246....0C
K 1.531 [0.260] D 2003yCat.2246....0C
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Identifiers (32) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

* 28 Sgr GCRV 11208 IRAS 18433-2226 TYC 6292-924-1
** SEE 360A GEN# +1.00173460 IRC -20516 WDS J18463-2224A
ADS 11652 A GSC 06292-00924 2MASS J18462062-2223315 WEB 15875
BD-22 4854 HD 173460 N30 4162 WISEA J184620.63-222331.7
CCDM J18463-2224A HIC 92111 PPM 268874 WISE J184620.58-222331.6
CD-22 13275 HIP 92111 SAO 187255 YZ 112 13027
CSI-22 4854 1 HR 7046 SKY# 34497 Gaia DR2 4078501807613954688
GC 25687 IDS 18403-2230 A TIC 177871472 Gaia DR3 4078501807613954688

References (82 between 1850 and 2026) (Total 82)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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Collections of Measurements Description of Measurements

Velocities : 5    Distance : 2    Fe/H : 6    Plx : 4    PM : 6    SpT : 2   

   

External archives :

Data at NED - NASA/IPAC Extragalactic Database : * 28 Sgr

Link by name to the catalogue in VizieR :

BD-22 4854 CCDM J18463-2224A CD-22 13275 GSC 06292-00924 HD 173460
HIC 92111 HIP 92111 HR 7046 IRAS 18433-2226 IRC -20516
2MASS J18462062-2223315 PPM 268874 SAO 187255 TYC 6292-924-1 WDS J18463-2224A
WISEA J184620.63-222331.7 WISE J184620.58-222331.6 Gaia DR2 4078501807613954688 Gaia DR3 4078501807613954688

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