NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-11-14 T22:56:38 PST
Help | Comment | NED Home

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 6945


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 6945                       20h39m00.6s -04d58m21s G        3797  0.012665      13.26    ...    24     1   29    7     1    5     1 Retrieve Retrieve 1   

Detailed information for each object


Object No. 1 - NGC 6945

INDEX for NGC 6945
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
   
29 Photometric data point(s) and SED   
Spectra   
Redshift-Independent Distances
24 Reference(s)   
7 Position data point(s)
1 Redshift data point(s)   
5 Diameter data point(s)   
1 Note(s)   
1 Association(s)   
RC3 data    

ESSENTIAL NOTE for NGC 6945 (Back to INDEX)
N/A

CROSS-IDENTIFICATIONS for NGC 6945 (Back to INDEX)
Object Names Type Object Names Type
NGC 6945G GALEXMSC J203900.67-045820.7 UvS
MCG -01-52-015 G LDCE 1410 NED003 G
2MASX J20390064-0458215 IrS HDCE 1117 NED003 G
2MASXi J2039005-045821 IrS NSA 148735 G
2MASS J20390037-0458213 IrS PGC 065132 G
2MASS J20390059-0458212 IrS [MWR99] 813-03115 G
GALEXASC J203900.62-045820.7 UvS    

COORDINATES for NGC 6945 (Back to INDEX)

Position Reference:20032MASX.C.......:

Reference    Frame     Longitude    Latitude        RA           DEC      Uncertainty Ellipse (arcsec)
                       (degrees)   (degrees)                              Semimajor Semiminor  PA(deg)
Equatorial (B1950.0)  309.092778   -5.149386  20h36m22.27s  -05d08m57.8s  1.25E+00  1.25E+00    0
Equatorial (J2000.0)  309.752583   -4.972583  20h39m00.62s  -04d58m21.3s  1.25E+00  1.25E+00    0
Ecliptic   (B1950.0)  310.135206   13.015641                              1.25E+00  1.25E+00    0
Ecliptic   (J2000.0)  310.832769   13.011039                              1.25E+00  1.25E+00    0
Galactic               41.150832  -26.140500                              1.25E+00  1.25E+00    0
SuperGalactic         259.718741   56.983166                              1.25E+00  1.25E+00    0
Additional detailed measurements with references are also available by clicking below:
7 Position data point(s)

REDSHIFT-INDEPENDENT DISTANCES for NGC 6945 (Back to INDEX)

2 Distances found in NED View 2 Individual Distance Measurement(s) for NGC 6945

Summary Statistics computed by NED from 2 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 6945 Distance Modulus
(mag)
Metric Distance
(Mpc)
Mean 33.29 45.550
Std. Dev. 0.23 4.738
Min. 33.13 42.200
Max. 33.45 48.900
Median 33.29 45.550

CLASSIFICATIONS (TYPES, ATTRIBUTES) for NGC 6945 (Back to INDEX)
TypeAs PublishedNED HomogenizedFlagReference Code
Galaxy MorphologyS0^-S0^-...1991RC3.9.C...0000d
Distance IndicatorTully-FisherTully-Fisher...2007A&A...465...71T
3 Detailed Classification(s)


FOREGROUND GALACTIC EXTINCTION for NGC 6945 (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]0.2160.1810.1370.1080.0750.2110.1650.1140.0850.0630.0350.0220.0150.008
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]0.2740.2180.1670.1350.0980.2600.1910.1390.1050.0750.0450.0290.0190.008


Galactic Extinction based on H I Column Densities and Galaxy Counts
(Burstein & Heiles; 1982AJ.....87.1165B) assuming Rv = 3.1:
AB = 0.140 mag
See Notes on Galactic Extinction for important caveats.

BASIC DATA for NGC 6945 (Back to INDEX)
Helio. Radial Velocity     :      3797 +/-       10 km/s      
Redshift                   :  0.012665 +/- 0.000033        1999A&AS..140..327M
Major Diameter (arcmin)    :   1.6
Minor Diameter (arcmin)    :   0.9
Magnitude and Filter       : 13.26
Classifications            : S0-                 

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:
1 Redshift data point(s)      29 photometric data point(s)      5 Diameter data point(s)      

QUANTITIES DERIVED FROM REDSHIFT for NGC 6945 (Details)(Back to INDEX)
Calculated and Corrected Velocities
V (Heliocentric)           :    3797 +/-     10 km/s      1999A&AS..140..327M
V (Kinematic LSR)          :    3809 +/-     10 km/s      1986MNRAS.221.1023K
V (Galactocentric GSR)     :    3937 +/-     11 km/s      1991RC3.9.C...0000d
V (Local Group)            :    3981 +/-     15 km/s      1996AJ....111..794K
V (3K CMB)                 :    3513 +/-     22 km/s      1996ApJ...473..576F
V (Virgo Infall only)      :    3916 +/-     16 km/s      2000ApJ...529..786M
V (Virgo + GA only)        :    4049 +/-     18 km/s      2000ApJ...529..786M
V (Virgo + GA + Shapley)   :    4067 +/-     18 km/s      2000ApJ...529..786M

Hubble Flow Distance and Distance Modulus (where Ho =   73.0 +/-   5 km/sec/Mpc)
D (Galactocentric GSR)     :    53.9 +/-    3.8 Mpc      (m-M) = 33.66 +/- 0.15 mag
D (Local Group)            :    54.5 +/-    3.8 Mpc      (m-M) = 33.68 +/- 0.15 mag
D (3K CMB)                 :    48.1 +/-    3.4 Mpc      (m-M) = 33.41 +/- 0.15 mag
D (Virgo Infall only)      :    53.6 +/-    3.8 Mpc      (m-M) = 33.65 +/- 0.15 mag
D (Virgo + GA only)        :    55.5 +/-    3.9 Mpc      (m-M) = 33.72 +/- 0.15 mag
D (Virgo + GA + Shapley)   :    55.7 +/-    3.9 Mpc      (m-M) = 33.73 +/- 0.15 mag

Scale at Hubble Flow Distances
Scale (Galactocentric GSR) :     261 pc/arcsec =  0.261 kpc/arcsec =  15.69 kpc/arcmin =   0.94 Mpc/degree
Scale (Local Group)        :     264 pc/arcsec =  0.264 kpc/arcsec =  15.86 kpc/arcmin =   0.95 Mpc/degree
Scale (3K CMB)             :     233 pc/arcsec =  0.233 kpc/arcsec =  14.00 kpc/arcmin =   0.84 Mpc/degree
Scale (Virgo Infall only)  :     260 pc/arcsec =  0.260 kpc/arcsec =  15.60 kpc/arcmin =   0.94 Mpc/degree
Scale (Virgo + GA only)    :     269 pc/arcsec =  0.269 kpc/arcsec =  16.14 kpc/arcmin =   0.97 Mpc/degree
Scale(Virgo + GA + Shapley):     270 pc/arcsec =  0.270 kpc/arcsec =  16.21 kpc/arcmin =   0.97 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 = 6.170 arcmin and Selected Redshift, defined by the Velocity Range: from to km/sec where V(Heliocentric) = 3797 km/sec
Cosmology-Corrected Quantities [Ho = 73.00 km/sec/Mpc, Ωmatter = 0.27, Ωvacuum = 0.73] [Redshift 0.011717 as corrected to the Reference Frame defined by the 3K Microwave Background Radiation] Luminosity Distance : 48.6 Mpc (m-M) = 33.43 mag Angular-Size Distance : 47.4 Mpc (m-M) = 33.38 mag Co-Moving Radial Distance : 48 Mpc (m-M) = 33.41 mag Co-Moving Tangential Dist. : 48 Mpc (m-M) = 33.41 mag Co-Moving Volume : 0.000463 Gpc^3 Light Travel-Time : 0.156 Gyr Age at Redshift 0.011717 : 13.143 Gyr Age of Universe : 13.299 Gyr Scale (Cosmology Corrected): 230 pc/arcsec = 0.230 kpc/arcsec = 13.80 kpc/arcmin = 0.83 Mpc/degree Surface Brightness Dimming : Flux Density per Unit Area = 0.95447; Magnitude per Unit Area = 0.05059 mag
To change Cosmological Input Parameters for Derived Quantities: Enter Your Preferred Values and click on "Submit Changed Hubble Parameters for this object" button
HoΩmatterΩvacuum     
Correct Redshift To the Reference Frame defined by: as Input for Calculation of the Distances and Cosmology-Corrected Quantities

QUICK-LOOK PHOTOMETRY and LUMINOSITIES for NGC 6945 (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)]
UltravioletNUV (GALEX) AB 17.8766 +/- 0.0130016 mag 2012GMSC..C...0000S-15.41 +/- 0.37 [mag] 2.14E+08 +/- 3.16E+07
Near-InfraredH 9.810 +/- 0.026 mag 20032MASX.C.......:-23.48 +/- 0.37 [mag] 1.43E+10 +/- 2.14E+09
NOTE: The above quantities are derived using an estimated Distance Modulus of (33.29 +/- 0.23) mag corresponding to
a Metric Distance of (45.550 +/- 4.738) 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 29 Photometric data point(s) available in NED.

QUICK-LOOK ANGULAR & PHYSICAL DIAMETERS for NGC 6945 (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_25; R_25 (blue) 97.3051.57... 25.0 B-mag arcsec^-2^ 1991RC3.9.C...0000d21.4911.39
K_s (2MASS "total") 102.5067.65110 Diameter for "total" magnitude 20032MASX.C.......:20032MASX.C.......:22.6414.94
NOTE: Physical diameters are derived using a scale of 0.2208 kpc/arcsec based on Average NED-D Metric Distance of (45.550 +/- 4.738) Mpc.
The quantities quoted above have not necessarily been corrected for foreground extinction.

View details for 5 Diameter data point(s) available in NED.

EXTERNAL ARCHIVES AND SERVICES for NGC 6945 Help (Back to INDEX)
Resources for Object NamesSite/Service
Query SIMBAD by primary NED object name -- NGC 6945SIMBAD (CDS, Strasbourg, France)
Revised New General Catalogue -- NGC 6945VizieR Catalog Query (U.S. mirror, CfA/Harvard)
Morphological Catalog of Galaxies -- MCG -01-52-015 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
2MASS Extended Source Images (JHKs) -- 2MASX J20390064-0458215 NASA/IPAC Infrared Science Archive (IRSA)
2MASS Extended Source Images (JHKs) -- 2MASXi J2039005-045821 NASA/IPAC Infrared Science Archive (IRSA)
Catalogue of Principal Galaxies -- PGC 065132 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
Retrieve mean data from LEDA -- PGC 065132 The Lyon/Meudon Extragalactic Database (LEDA)
Query GALEX (NUV/FUV) Mission Archive (7.2 arcsec search radius) -- NGC 6945GALEX Mission Data Archive at MAST
Explore IRSA resources with RADAR (10 arcsec search radius) -- NGC 6945NASA/IPAC Infrared Science Archive (IRSA)
Resources for position 20h39m00.6s, -04d58m21s (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)
version
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

Back to the list




Back to NED Home