Date and Time of the Query: 2019-08-17 T15:56:26 PDT
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You have selected the following parameters to search on:

Parameters for Distances and Cosmology: Ho= 73.0; Ωmatter = 0.27; Ωvacuum = 0.73;
Derived Quantities use a Redshift corrected to a Reference Frame defined by the 3K CMB

NED results for object 1ES 1727+502

1 objects found in NED.    


 Row          Object Name                 EquJ2000.0       Object  Velocity/Redshift    Mag./  Separ.               Number of                                 Row 
 No.     (* => Essential Note)       RA               DEC  Type     km/s       z   Qual Filter arcmin Refs Notes Phot Posn Vel/z Diam Assoc Images   Spectra  No. 
1   *I Zw 187                       17h28m18.6s +50d13m10s G       16610  0.055405      15.15    ...   294     8   83   25    16    2     3 Retrieve Retrieve 1   

Detailed information for each object

Object No. 1 - I Zw 187

INDEX for I Zw 187
Essential Data (jump to sub-section of this query report):

   Essential Note    
   Basic Data   
   Quantities Derived from Redshift    
   Redshift-Independent Distances
   Quick-Look Photometry and Luminosities
   Quick-Look Angular and Physical Sizes
   Foreground Galactic Extinction    
   External Services
Detailed Data (NED queries):

83 Photometric data point(s) and SED   
Redshift-Independent Distances
294 Reference(s)   
25 Position data point(s)
16 Redshift data point(s)   
2 Diameter data point(s)   
8 Note(s)   
3 Association(s)   
RC3 data    
HB89 data    

ESSENTIAL NOTE for I Zw 187 (Back to INDEX)
Mislabeled as I Zw 186 in Craine's Handbook of QSOs.                            

Object Names Type Object Names Type
I Zw 187G VIPS 1090 RadioS
II Zw 077 G VIPS J17283+5013 RadioS
CGPG 1727.1+5015 G WB J1728+5013 RadioS
[HB89] 1727+502 NED01 QSO WIBRaLS J1728+5013 G
WISE J172818.63+501310.4 IrS RX J1728.2+5013 XrayS
WISE J172818.63+501310.5 IrS RX J1728.3+5013 XrayS
2MASX J17281863+5013103 IrS RX J172819.1+501309 XrayS
2MASXi J1728186+501310 IrS 1RXS J172818.3+501310 XrayS
2MASS J17281863+5013103 IrS AX J1728.2+5013 XrayS
LQAC 262+050 001 G 1AXG J172815+5013 XrayS
CGRaBS J1728+5013 QSO 1H 1727+502 QSO
PGC 060348 G 1H 1730+500 XrayS
RBS 1649 QSO 1ES 1727+502 XrayS
UVQS J172818.63+501310.5 QSO XRS 17271+503 XrayS
BZB J1728+5013 QSO XSS J17272+5025 XrayS
1WHSP J172818.6+501310 QSO 3FGL J1728.3+5013 GammaS
MG4 J172809+5013 RadioS2FGL J1728.2+5015 GammaS
MG4 J172828+5013 RadioS1FGL J1727.9+5010 GammaS
87GB 172704.2+501535 RadioSTeV J1728+502 GammaS
87GB[BWE91] 1727+5015 RadioSRX J1728.3+5013:[BEV98] 002 G
[WB92] 1727+5015 RadioS[VCV2001] J172818.6+501311 QSO
NVSS J172818+501311 RadioS[AUO2003] 17_01 NED04 QSO
OT +546 RadioS[AUO2003] NO23 QSO
CRATES J1728+5013 RadioSRX J1728.3+5013:[ZEH2003] 01 G
CRATES J172818.62+501310.5 RadioS[HRT2007] J172818+501315 RadioS
TXS 1727+502 RadioS[MGL2009] 2253 QSO
EF B1727+5015 RadioS[LTS2012] J17283+5013 G
GB6 J1728+5013 RadioS[MGD2014] 1727.0+5015 RadioS
ICRF J172818.6+501310 RadioS    
IERS B1727+502 RadioS    
RGB J1728+502 RadioS    

COORDINATES for I Zw 187 (Back to INDEX)

Position Reference:2011AJ....142...89P

Reference    Frame     Longitude    Latitude        RA           DEC      Uncertainty Ellipse (arcsec)
                       (degrees)   (degrees)                              Semimajor Semiminor  PA(deg)
Equatorial (B1950.0) 261.7680806  50.2586656 17h27m04.3393s +50d15m31.196s  1.30E-03  7.00E-04   90
Equatorial (J2000.0) 262.0776000  50.2195747 17h28m18.6240s +50d13m10.469s  1.30E-03  7.00E-04   90
Ecliptic   (B1950.0) 251.5608865  73.1775536                              1.30E-03  7.00E-04   79
Ecliptic   (J2000.0) 252.2646761  73.1712512                              1.30E-03  7.00E-04   79
Galactic              77.0676695  33.5370065                              1.30E-03  7.00E-04  177
SuperGalactic         48.6614712  51.3030201                              1.30E-03  7.00E-04  125
Additional detailed measurements with references are also available by clicking below:
25 Position data point(s)


1 Distances found in NED View 1 Individual Distance Measurement(s) for I Zw 187

Summary Statistics computed by NED from 1 Distance(s) in the literature:
NOTE: These summary statistics are provided for "quick-look" reference only;
they are based exclusively on original values, as published.
No homogenization or corrections have been applied.

I Zw 187 Distance Modulus
Metric Distance
Mean 37.00 238.000
Std. Dev. N/A N/A
Min. 37.00 238.000
Max. 37.00 238.000
Median 37.00 238.000

TypeAs PublishedNED HomogenizedFlagReference Code
Activity TypeFlat-Spectrum Radio Source,Flat-Spectrum Radio Source...2007ApJS..171...61H
Distance IndicatorBL Lac LuminosityBL Lac Luminosity...2005ApJ...635..173S
3 Detailed Classification(s)

Galactic Extinction from the Schlafly & Finkbeiner 2011, Appendix; 2011ApJ...737..103S (SF11) recalibration 
of the Schlegel, Finkbeiner & Davis 1998, Appendix B; 1998ApJ...500..525S (SFD98) infrared-based dust map.
The map is based on dust emission from COBE/DIRBE and IRAS/ISSA;
the recalibration assumes a Fitzpatrick (1999PASP..111...63F) reddening law with Rv = 3.1 and different source spectrum than SFD98.

L a n d o l tS D S SU K I R T
Filter [µm]U (0.35)B (0.43)V (0.54)R (0.64)I (0.80)u (0.36)g (0.47)r (0.62)i (0.75)z (0.89)J (1.25)H (1.66)K (2.19)L' (3.78)
Aλ [mag]0.1280.1070.0810.0640.0440.1250.0980.0680.0500.0370.0210.0130.0090.005
Show/Hide Aλ magnitudes in all 88 photometric bands based on SF11
For completeness, we include the original SFD98 values:
L a n d o l tS D S SU K I R T
Filter [µm]U (0.34)B (0.44)V (0.54)R (0.65)I (0.81)u (0.35)g (0.49)r (0.63)i (0.78)z (0.93)J (1.27)H (1.67)K (2.22)L' (3.81)
Aλ [mag]0.1600.1270.0980.0790.0570.1520.1120.0810.0610.0440.0270.0170.0110.005

Galactic Extinction based on H I Column Densities and Galaxy Counts
(Burstein & Heiles; 1982AJ.....87.1165B) assuming Rv = 3.1:
AB = 0.090 mag
See Notes on Galactic Extinction for important caveats.

BASIC DATA for I Zw 187 (Back to INDEX)
Helio. Radial Velocity     :     16610 +/-       60 km/s      
Redshift                   :  0.055405 +/- 0.000200        1991RC3.9.C...0000d
Major Diameter (arcmin)    :      
Minor Diameter (arcmin)    :      
Magnitude and Filter       : 15.15
Classifications            :                BLLAC

NOTE: This information is indicative only. With the exception of the
      redshift they are unreferenced and highly inhomogeneous as to
      their origin. The Radial Velocity (when available) is computed
      from the listed redshift. The remaining values are designed to
      orient the user with a quick-look, overall assessment of the
      general properties of the object in question. They are not
      averages nor are they standardized in any way.
Additional detailed measurements with references are also available by clicking below:
16 Redshift data point(s)      83 photometric data point(s)      2 Diameter data point(s)      

Calculated and Corrected Velocities
V (Heliocentric)           :   16610 +/-     60 km/s      1991RC3.9.C...0000d
V (Kinematic LSR)          :   16629 +/-     60 km/s      1986MNRAS.221.1023K
V (Galactocentric GSR)     :   16804 +/-     60 km/s      1991RC3.9.C...0000d
V (Local Group)            :   16850 +/-     62 km/s      1996AJ....111..794K
V (3K CMB)                 :   16559 +/-     60 km/s      1996ApJ...473..576F
V (Virgo Infall only)      :   16929 +/-     62 km/s      2000ApJ...529..786M
V (Virgo + GA only)        :   16893 +/-     62 km/s      2000ApJ...529..786M
V (Virgo + GA + Shapley)   :   16924 +/-     62 km/s      2000ApJ...529..786M

Hubble Flow Distance and Distance Modulus (where Ho =   73.0 +/-   5 km/sec/Mpc)
D (Galactocentric GSR)     :   230.2 +/-   16.1 Mpc      (m-M) = 36.81 +/- 0.15 mag
D (Local Group)            :   230.8 +/-   16.2 Mpc      (m-M) = 36.82 +/- 0.15 mag
D (3K CMB)                 :   226.8 +/-   15.9 Mpc      (m-M) = 36.78 +/- 0.15 mag
D (Virgo Infall only)      :   231.9 +/-   16.3 Mpc      (m-M) = 36.83 +/- 0.15 mag
D (Virgo + GA only)        :   231.4 +/-   16.2 Mpc      (m-M) = 36.82 +/- 0.15 mag
D (Virgo + GA + Shapley)   :   231.8 +/-   16.2 Mpc      (m-M) = 36.83 +/- 0.15 mag

Scale at Hubble Flow Distances
Scale (Galactocentric GSR) :    1116 pc/arcsec =  1.116 kpc/arcsec =  66.96 kpc/arcmin =   4.02 Mpc/degree
Scale (Local Group)        :    1119 pc/arcsec =  1.119 kpc/arcsec =  67.15 kpc/arcmin =   4.03 Mpc/degree
Scale (3K CMB)             :    1100 pc/arcsec =  1.100 kpc/arcsec =  65.98 kpc/arcmin =   3.96 Mpc/degree
Scale (Virgo Infall only)  :    1124 pc/arcsec =  1.124 kpc/arcsec =  67.46 kpc/arcmin =   4.05 Mpc/degree
Scale (Virgo + GA only)    :    1122 pc/arcsec =  1.122 kpc/arcsec =  67.31 kpc/arcmin =   4.04 Mpc/degree
Scale(Virgo + GA + Shapley):    1124 pc/arcsec =  1.124 kpc/arcsec =  67.44 kpc/arcmin =   4.05 Mpc/degree

To Search for Nearby Objects (Physical Companions): Enter Your Preferred Values and click on "Submit Environment Search" button
Search for Objects within +/-arcmin where 100 kpc = 1.483 arcmin and Selected Redshift, defined by the Velocity Range: from to km/sec where V(Heliocentric) = 16610 km/sec
Cosmology-Corrected Quantities [Ho = 73.00 km/sec/Mpc, Ωmatter = 0.27, Ωvacuum = 0.73] [Redshift 0.055234 as corrected to the Reference Frame defined by the 3K Microwave Background Radiation] Luminosity Distance : 237 Mpc (m-M) = 36.87 mag Angular-Size Distance : 213 Mpc (m-M) = 36.64 mag Co-Moving Radial Distance : 224 Mpc (m-M) = 36.75 mag Co-Moving Tangential Dist. : 224 Mpc (m-M) = 36.75 mag Co-Moving Volume : 0.0472 Gpc^3 Light Travel-Time : 0.712 Gyr Age at Redshift 0.055234 : 12.587 Gyr Age of Universe : 13.299 Gyr Scale (Cosmology Corrected): 1030 pc/arcsec = 1.030 kpc/arcsec = 61.82 kpc/arcmin = 3.71 Mpc/degree Surface Brightness Dimming : Flux Density per Unit Area = 0.80650; Magnitude per Unit Area = 0.2335 mag
To change Cosmological Input Parameters for Derived Quantities: Enter Your Preferred Values and click on "Submit Changed Hubble Parameters for this object" button
Correct Redshift To the Reference Frame defined by: as Input for Calculation of the Distances and Cosmology-Corrected Quantities


The brightest flux in each of the following spectral regions, when available:
Gamma-Ray (ν > 2E19 Hz); X-Ray (2E19 Hz > ν > 2E16 Hz); Ultraviolet (2E16 Hz > ν > 9E14 Hz); Visual (9E14 Hz > ν > 3E14 Hz);
Near-Infrared (3E14 Hz > ν > 6E13 Hz); Mid-Infrared (6E13 Hz > ν > 7.5E12 Hz); Far-Infrared (7.5E12 Hz > ν > 1E12 Hz);
Sub-Millimeter (1E12 Hz > ν > 3E11 Hz); Millimeter (3E11 Hz > ν > 3E10 Hz); Radio (3E10 Hz > ν).

Band Apparent Mag or Flux Refcode Absolute Mag or νLν [W] νLν [L(Bolometric)]
Gamma-Ray100 MeV-100 GeV LAT 11.7E-12 +/- 3.8E-12 erg/s/cm^2^ 2010ApJS..188..405A 7.93E+36 +/- 2.58E+36 [W] 2.06E+10 +/- 6.70E+09
X-Ray0.1-2.4 keV (ROSAT) 20.374E-12 erg/cm^2^/s 2009A&A...495..691M 1.38E+37 [W] 3.59E+10
UltravioletUVW2 (Swift/UVOT) 7.2E-12 +/- 0.3E-12 erg/cm^2^/s 2014A&A...563A..90A 4.88E+36 +/- 2.04E+35 [W] 1.27E+10 +/- 5.30E+08
VisualU (Swift/UVOT) 6.7E-12 +/- 0.4E-12 erg/cm^2^/s 2014A&A...563A..90A 4.54E+36 +/- 2.71E+35 [W] 1.18E+10 +/- 7.04E+08
Near-InfraredH 13.009 +/- 0.059 mag 20032MASX.C.......:-23.99 +/- 0.06 [mag] 2.06E+10 +/- 1.15E+09
Mid-Infrared12 microns (IRAS) <37.0 milliJy 1988AJ.....95..307I < 11.7E-12 6.27E+36 [W] < 11.7E-12 1.63E+10
Far-Infrared60 microns (IRAS) <64.0 milliJy 1988AJ.....95..307I < 11.7E-12 2.17E+36 [W] < 11.7E-12 5.64E+09
Millimeter226 GHz (NRAO) 0.1 +/- 0.2 Jy 1983ApJ...268...68L 1.53E+35 +/- 3.06E+35 [W] 3.98E+08 +/- 7.97E+08
Radio365 MHz (Texas) 0.223 +/- 0.020 Jy 1996AJ....111.1945D 5.52E+32 +/- 4.95E+31 [W] 1.43E+06 +/- 1.29E+05
NOTE: The above quantities are derived using an estimated Distance Modulus of (37.00 +/- N/A) mag corresponding to
a Metric Distance of (238.000 +/- N/A) Mpc using the Average NED-D value.
The quantities quoted above have not necessarily been corrected for foreground extinction, and no K-Corrections have been applied.

View details and SED for 83 Photometric data point(s) available in NED.


The largest diameters in the Visual and Near-Infrared spectral regions, when available:

Passband Apparent Major Axis
(2a) [arcsec]
Apparent Minor Axis
(2b) [arcsec]
Reference Level RefcodePhysical Major Axis
(2a) [kpc]
Physical Minor Axis
(2b) [kpc]
K_s (2MASS "total") 29.6024.2715 Diameter for "total" magnitude 20032MASX.C.......:20032MASX.C.......:34.1528.01
NOTE: Physical diameters are derived using a scale of 1.1539 kpc/arcsec based on Average NED-D Metric Distance of (238.000 +/- N/A) Mpc.
The quantities quoted above have not necessarily been corrected for foreground extinction.

View details for 2 Diameter data point(s) available in NED.

Resources for Object NamesSite/Service
Query SIMBAD by primary NED object name -- I Zw 187SIMBAD (CDS, Strasbourg, France)
2MASS Extended Source Images (JHKs) -- 2MASX J17281863+5013103 NASA/IPAC Infrared Science Archive (IRSA)
2MASS Extended Source Images (JHKs) -- 2MASXi J1728186+501310 NASA/IPAC Infrared Science Archive (IRSA)
Catalogue of Principal Galaxies -- PGC 060348 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
Retrieve mean data from LEDA -- PGC 060348 The Lyon/Meudon Extragalactic Database (LEDA)
NRAO/VLA Sky Survey (NVSS)
Texas Survey of radio sources at 365MHz -- TXS 1727+502 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
GB6 catalog of radio sources -- GB6 J1728+5013 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
Query GALEX (NUV/FUV) Mission Archive (7.2 arcsec search radius) -- I Zw 187GALEX Mission Data Archive at MAST
Explore IRSA resources with RADAR (10 arcsec search radius) -- I Zw 187NASA/IPAC Infrared Science Archive (IRSA)
Resources for position 17h28m18.6s, +50d13m10s (J2000)Site/Service
Query Optical and UV Mission Archives (Default search radius)Multimission Archive at STScI (MAST)
Query High Energy Mission Archives (Default search radius)HEASARC (NASA/GSFC)
SDSS Sky Server
Query IRSA for WISE images (10 arcmin search radius)NASA/IPAC Infrared Science Archive (IRSA)
Band(s): Size:
NASA/IPAC Infrared Science Archive (IRSA)
Band(s): Size:
NASA/IPAC Infrared Science Archive (IRSA)
NASA/IPAC Infrared Science Archive (IRSA)
 Size:    Contours (PS)  JPEG  FITS File 
NRAO/VLA Sky Survey (NVSS)
The NRAO Data Archive System

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