NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-11-19 T16:46:19 PST
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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 NGC 6946


1 objects found in NED.    

SOURCE LIST

 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    NGC 6946                       20h34m52.3s +60d09m14s G          40  0.000133      8.23B    ...  1555    30  221   40    15    8     0 Retrieve Retrieve 1   

Detailed information for each object


Object No. 1 - NGC 6946

INDEX for NGC 6946
Essential Data (jump to sub-section of this query report):

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

Images
   
221 Photometric data point(s) and SED   
Spectra   
Redshift-Independent Distances
1555 Reference(s)   
40 Position data point(s)
15 Redshift data point(s)   
8 Diameter data point(s)   
30 Note(s)   
UGC data    
RC3 data    

ESSENTIAL NOTE for NGC 6946 (Back to INDEX)
N/A

CROSS-IDENTIFICATIONS for NGC 6946 (Back to INDEX)
Object Names Type Object Names Type
NGC 6946G NVSS J203452+600916 RadioS
UGC 11597 G 8C 2033+599 RadioS
ARP 029 G RGB J2034+601 RadioS
CGCG 304-006 G FVW G095.5+11.5 RadioS
CGCG 2033.8+5959 G CXO J203452.3+600914 XrayS
MCG +10-29-006 G RX J2034.9+6010 XrayS
Fireworks G 2XMM J203452.4+600912 XrayS
2MASX J20345233+6009132 IrS 2XMMp J203452.4+600912 XrayS
IRAS 20338+5958 IrS CXO J203452.33+600914.3 XrayS
IRAS F20338+5958 IrS NGC 6946:[FT87] 1 XrayS
LDCE 1412 NED003 G [SPB93] 263 G
HDCE 1123 NED001 G NGC 6946:[RW2000] X-06 XrayS
PGC 065001 G [SGT2004] J203452.30+600911.7 XrayS
UZC J203452.8+600911 G NGC 6946:[LB2005] X01 XrayS
11HUGS 410 G [HRT2007] J203452+600927 RadioS
87GB 203349.0+595856 RadioSNGC 6946:[L2011a] X0021 XrayS
87GB[BWE91] 2033+5958 RadioS    
[WB92] 2033+5958 RadioS    
     

COORDINATES for NGC 6946 (Back to INDEX)

Position Reference:2010ApJS..189...37E

Reference    Frame     Longitude    Latitude        RA           DEC      Uncertainty Ellipse (arcsec)
                       (degrees)   (degrees)                              Semimajor Semiminor  PA(deg)
Equatorial (B1950.0) 308.4551344  59.9803132 20h33m49.232s +59d58m49.13s  2.90E-01  2.90E-01    0
Equatorial (J2000.0) 308.7180150  60.1539150 20h34m52.323s +60d09m14.09s  2.90E-01  2.90E-01    0
Ecliptic   (B1950.0) 357.2532523  71.8507278                              2.90E-01  2.90E-01    0
Ecliptic   (J2000.0) 357.9319793  71.8509158                              2.90E-01  2.90E-01    0
Galactic              95.7189315  11.6729771                              2.90E-01  2.90E-01    0
SuperGalactic         10.0320408  42.0026032                              2.90E-01  2.90E-01    0
Additional detailed measurements with references are also available by clicking below:
40 Position data point(s)

REDSHIFT-INDEPENDENT DISTANCES for NGC 6946 (Back to INDEX)

32 Distances found in NED View 32 Individual Distance Measurement(s) for NGC 6946

Summary Statistics computed by NED from 32 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.


NGC 6946 Distance Modulus
(mag)
Metric Distance
(Mpc)
Mean 28.67 5.545
Std. Dev. 0.43 1.471
Min. 28.02 4.020
Max. 30.52 12.700
Median 28.66 5.385

CLASSIFICATIONS (TYPES, ATTRIBUTES) for NGC 6946 (Back to INDEX)
TypeAs PublishedNED HomogenizedFlagReference Code
HierarchyIIsolated galaxy...1975ApJ...196..313S
KinematicsHI line widthHI line width...1988ApJS...67....1T
Luminosity Class6.0LC III-IV...1991RC3.9.C...0000d
Galaxy MorphologySAB(rs)cdSAB(rs)cd...1991RC3.9.C...0000d
Distance IndicatorTully-FisherTully-Fisher...1988NBGC.C....0000T
57 Detailed Classification(s)


FOREGROUND GALACTIC EXTINCTION for NGC 6946 (Back to INDEX)
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]1.4831.2410.9380.7420.5151.4511.1300.7820.5810.4320.2430.1540.1030.052
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]1.8581.4751.1330.9140.6631.7621.2970.9410.7130.5060.3080.1970.1250.052


Galactic Extinction based on H I Column Densities and Galaxy Counts
(Burstein & Heiles; 1982AJ.....87.1165B) assuming Rv = 3.1:
AB = 1.610 mag
See Notes on Galactic Extinction for important caveats.

BASIC DATA for NGC 6946 (Back to INDEX)
Helio. Radial Velocity     :        40 +/-        2 km/s      
Redshift                   :  0.000133 +/- 0.000007        2008MNRAS.388..500E
Major Diameter (arcmin)    :  11.5
Minor Diameter (arcmin)    :   9.8
Magnitude and Filter       : 8.23B
Classifications            : SAB(rs)cd;Sy2  HII  

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:
15 Redshift data point(s)      221 photometric data point(s)      8 Diameter data point(s)      

QUANTITIES DERIVED FROM REDSHIFT for NGC 6946 (Details)(Back to INDEX)
Calculated and Corrected Velocities
V (Heliocentric)           :      40 +/-      2 km/s      2008MNRAS.388..500E
V (Kinematic LSR)          :      55 +/-      2 km/s      1986MNRAS.221.1023K
V (Galactocentric GSR)     :     266 +/-      9 km/s      1991RC3.9.C...0000d
V (Local Group)            :     344 +/-     18 km/s      1996AJ....111..794K
V (3K CMB)                 :    -141 +/-     13 km/s      1996ApJ...473..576F
V (Virgo Infall only)      :     403 +/-     19 km/s      2000ApJ...529..786M
V (Virgo + GA only)        :     400 +/-     19 km/s      2000ApJ...529..786M
V (Virgo + GA + Shapley)   :     401 +/-     19 km/s      2000ApJ...529..786M

Hubble Flow Distance and Distance Modulus (where Ho =   73.0 +/-   5 km/sec/Mpc)
D (Galactocentric GSR)     :    3.65 +/-   0.29 Mpc      (m-M) = 27.81 +/- 0.16 mag
D (Local Group)            :    4.71 +/-   0.41 Mpc      (m-M) = 28.36 +/- 0.18 mag
D (3K CMB)                 :     N/A   
D (Virgo Infall only)      :    5.52 +/-   0.39 Mpc      (m-M) = 28.71 +/- 0.15 mag
D (Virgo + GA only)        :    5.48 +/-   0.38 Mpc      (m-M) = 28.69 +/- 0.15 mag
D (Virgo + GA + Shapley)   :    5.49 +/-   0.39 Mpc      (m-M) = 28.70 +/- 0.15 mag

Scale at Hubble Flow Distances
Scale (Galactocentric GSR) :      18 pc/arcsec =  0.018 kpc/arcsec =   1.06 kpc/arcmin =   0.06 Mpc/degree
Scale (Local Group)        :      23 pc/arcsec =  0.023 kpc/arcsec =   1.37 kpc/arcmin =   0.08 Mpc/degree
Scale (3K CMB)             :     N/A 
Scale (Virgo Infall only)  :      27 pc/arcsec =  0.027 kpc/arcsec =   1.61 kpc/arcmin =   0.10 Mpc/degree
Scale (Virgo + GA only)    :      27 pc/arcsec =  0.027 kpc/arcsec =   1.59 kpc/arcmin =   0.10 Mpc/degree
Scale(Virgo + GA + Shapley):      27 pc/arcsec =  0.027 kpc/arcsec =   1.60 kpc/arcmin =   0.10 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 = 62.591 arcmin and Selected Redshift, defined by the Velocity Range: from to km/sec where V(Heliocentric) = 40 km/sec
Cosmology-Corrected Quantities [Ho = 73.00 km/sec/Mpc, Ωmatter = 0.27, Ωvacuum = 0.73] [Redshift -0.000471 as corrected to the Reference Frame defined by the 3K Microwave Background Radiation] Cosmology Computations unstable or undefined

QUICK-LOOK PHOTOMETRY and LUMINOSITIES for NGC 6946 (Back to INDEX)

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).

Spectral
Region
Band Apparent Mag or Flux Refcode Absolute Mag or νLν [W] νLν [L(Bolometric)]
X-Ray0.2-4 keV (EINSTEIN) 32.05E-13 ergs sec^-1^ cm^-2^ 1992ApJS...80..531F 1.18E+33 [W] 3.07E+06
UltravioletNUV (GALEX) AB 9.741 +/- 0.002 mag 2009ApJ...703.1569M-18.93 +/- 0.23 [mag] 5.82E+09 +/- 5.46E+08
VisualR (SAO) 7.08E-11 erg s^-1^ cm^-2^ 2005A&A...434..935K 2.60E+34 [W] 6.77E+07
Near-InfraredJ_tot (2MASS LGA) 6.270 +/- 0.025 mag 2003AJ....125..525J-22.40 +/- 0.24 [mag] 1.13E+10 +/- 1.10E+09
Mid-Infrared25 microns (IRAS) 21.18 +/- 15 % Jy 1988ApJS...68...91R 9.36E+35 +/- 1.66E+35 [W] 2.43E+09 +/- 4.31E+08
Far-InfraredFIR (IRAS) 8.78E-12 W m^-2^ 1988ApJS...68...91R 3.23E+36 [W] 8.41E+09
Sub-Millimeter350 microns (SPIRE) 1.09E+2 +/- 0.08E+2 Jy 2012ApJ...745...95D 3.44E+35 +/- 4.09E+34 [W] 8.94E+08 +/- 1.06E+08
Millimeter33 GHz (GBT) 15.7 +/- 0.79 milliJy 2010ApJ...709L.108M 1.91E+30 +/- 2.03E+29 [W] 4.96E+03 +/- 5.28E+02
Radio57.5 MHz 13.0 +/- 2.0 Jy 1990ApJ...352...30I 2.75E+30 +/- 4.95E+29 [W] 7.15E+03 +/- 1.29E+03
NOTE: The above quantities are derived using an estimated Distance Modulus of (28.67 +/- 0.43) mag corresponding to
a Metric Distance of (5.545 +/- 1.471) 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 221 Photometric data point(s) available in NED.

QUICK-LOOK ANGULAR & PHYSICAL DIAMETERS for NGC 6946 (Back to INDEX)

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

Passband Apparent Major Axis
(2a) [arcsec]
Apparent Minor Axis
(2b) [arcsec]
PA
[degrees]
(J2000.0)
Reference Level RefcodePhysical Major Axis
(2a) [kpc]
Physical Minor Axis
(2b) [kpc]
RC3 D_0 (blue) 995.80...... 25.0 B-mag arcsec^-2^ 1991RC3.9.C...0000d26.77...
K_s (LGA/2MASS "total") 958.00670.6052 Diameter for "total" magnitude 2003AJ....125..525J2003AJ....125..525J25.7518.03
NOTE: Physical diameters are derived using a scale of 0.0269 kpc/arcsec based on Average NED-D Metric Distance of (5.545 +/- 1.471) Mpc.
The quantities quoted above have not necessarily been corrected for foreground extinction.

View details for 8 Diameter data point(s) available in NED.

EXTERNAL ARCHIVES AND SERVICES for NGC 6946 Help (Back to INDEX)
Resources for Object NamesSite/Service
Query SIMBAD by primary NED object name -- NGC 6946SIMBAD (CDS, Strasbourg, France)
Revised New General Catalogue -- NGC 6946VizieR Catalog Query (U.S. mirror, CfA/Harvard)
Uppsala General Catalog -- UGC 11597 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
Original Zwicky Catalog -- CGCG 304-006 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
Query UZC Spectral Archive (60 arcsec search radius)Updated Zwicky Catalog Data (Harvard/SAO)
Morphological Catalog of Galaxies -- MCG +10-29-006 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
2MASS Extended Source Images (JHKs) -- 2MASX J20345233+6009132 NASA/IPAC Infrared Science Archive (IRSA)
IRAS Point Source Catalog -- IRAS 20338+5958 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
IRAS Faint Source Catalog -- IRAS F20338+5958 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
Catalogue of Principal Galaxies -- PGC 065001 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
Retrieve mean data from LEDA -- PGC 065001 The Lyon/Meudon Extragalactic Database (LEDA)
NRAO/VLA Sky Survey (NVSS)
Query GALEX (NUV/FUV) Mission Archive (7.2 arcsec search radius) -- NGC 6946GALEX Mission Data Archive at MAST
Explore IRSA resources with RADAR (10 arcsec search radius) -- NGC 6946NASA/IPAC Infrared Science Archive (IRSA)
Resources for position 20h34m52.3s, +60d09m14s (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)
Explore resources with DataScope (15 arcmin search radius)HEASARC (NASA/GSFC)
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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