Date and Time of the Query: 2019-06-24 T05:34:13 PDT
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Velocity(km/s): Unconstrained
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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

Detailed Information for Object No. 1

INDEX for IC 2957
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):

64 Photometric data point(s) and SED   
Redshift-Independent Distances
47 Reference(s)   
13 Position data point(s)
12 Redshift data point(s)   
11 Diameter data point(s)   

ESSENTIAL NOTE for IC 2957 (Back to INDEX)
Not to be confused with IC 2954 which is a star 4.5 degrees away.               

Object Names Type Object Names Type
IC 2957G CG 0124 G
CGCG 157-031 G USGC U414 NED03 G
CGCG 1143.0+3135 G AGC 210752 G
MCG +05-28-028 G ASK 509837.0 G
2MASX J11453698+3117584 IrS MAPS-NGP O_320_0074857 G
2MASXi J1145369+311758 IrS NSA 088778 G
2MASS J11453696+3117585 IrS PGC 036653 G
SDSS J114536.93+311758.4 G UZC J114537.0+311758 G
SDSS J114536.93+311758.5 G UZC-CG 147 NED04 G
GALEXASC J114537.06+311758.1 UvS FIRST J114536.9+311759 RadioS
AKARI J1145365+311756 IrS NVSS J114536+311801 RadioS

COORDINATES for IC 2957 (Back to INDEX)

Position Reference:2007SDSS6.C...0000:

Reference    Frame     Longitude    Latitude        RA           DEC      Uncertainty Ellipse (arcsec)
                       (degrees)   (degrees)                              Semimajor Semiminor  PA(deg)
Equatorial (B1950.0)  175.751620   31.577267 11h43m00.389s +31d34m38.16s  5.00E-01  5.00E-01    0
Equatorial (J2000.0)  176.403905   31.299569 11h45m36.937s +31d17m58.45s  5.00E-01  5.00E-01    0
Ecliptic   (B1950.0)  162.599756   27.084434                              5.00E-01  5.00E-01    0
Ecliptic   (J2000.0)  163.301511   27.085853                              5.00E-01  5.00E-01    0
Galactic              192.806655   75.061347                              5.00E-01  5.00E-01    0
SuperGalactic          81.543827   -6.006116                              5.00E-01  5.00E-01    0
Additional detailed measurements with references are also available by clicking below:
13 Position data point(s)


1 Distances found in NED View 1 Individual Distance Measurement(s) for IC 2957

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.

IC 2957 Distance Modulus
Metric Distance
Mean 31.03 16.100
Std. Dev. N/A N/A
Min. 31.03 16.100
Max. 31.03 16.100
Median 31.03 16.100

TypeAs PublishedNED HomogenizedFlagReference Code
KinematicsHI line widthHI line width...2005ApJS..160..149S
2 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]0.1050.0880.0660.0520.0360.1020.0800.0550.0410.0310.0170.0110.0070.004
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]0.1310.1040.0800.0640.0470.1240.0910.0660.0500.0360.0220.0140.0090.004

Galactic Extinction based on H I Column Densities and Galaxy Counts
(Burstein & Heiles; 1982AJ.....87.1165B) assuming Rv = 3.1:
AB = 0.030 mag
See Notes on Galactic Extinction for important caveats.

BASIC DATA for IC 2957 (Back to INDEX)
Helio. Radial Velocity     :      1776 +/-        3 km/s      
Redshift                   :  0.005925 +/- 0.000011        2006SDSS5.C...0000:
Major Diameter (arcmin)    :  0.89
Minor Diameter (arcmin)    :  0.49
Magnitude and Filter       : 14.8g
Classifications            : S0-a                

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:
12 Redshift data point(s)      64 photometric data point(s)      11 Diameter data point(s)      

Calculated and Corrected Velocities
V (Heliocentric)           :    1776 +/-      3 km/s      2006SDSS5.C...0000:
V (Kinematic LSR)          :    1780 +/-      3 km/s      1986MNRAS.221.1023K
V (Galactocentric GSR)     :    1767 +/-      3 km/s      1991RC3.9.C...0000d
V (Local Group)            :    1741 +/-      4 km/s      1996AJ....111..794K
V (3K CMB)                 :    2064 +/-     20 km/s      1996ApJ...473..576F
V (Virgo Infall only)      :    2119 +/-     27 km/s      2000ApJ...529..786M
V (Virgo + GA only)        :    2308 +/-     30 km/s      2000ApJ...529..786M
V (Virgo + GA + Shapley)   :    2320 +/-     30 km/s      2000ApJ...529..786M

Hubble Flow Distance and Distance Modulus (where Ho =   73.0 +/-   5 km/sec/Mpc)
D (Galactocentric GSR)     :    24.2 +/-    1.7 Mpc      (m-M) = 31.92 +/- 0.15 mag
D (Local Group)            :    23.9 +/-    1.7 Mpc      (m-M) = 31.89 +/- 0.15 mag
D (3K CMB)                 :    28.3 +/-    2.0 Mpc      (m-M) = 32.26 +/- 0.15 mag
D (Virgo Infall only)      :    29.0 +/-    2.1 Mpc      (m-M) = 32.31 +/- 0.15 mag
D (Virgo + GA only)        :    31.6 +/-    2.2 Mpc      (m-M) = 32.50 +/- 0.15 mag
D (Virgo + GA + Shapley)   :    31.8 +/-    2.2 Mpc      (m-M) = 32.51 +/- 0.15 mag

Scale at Hubble Flow Distances
Scale (Galactocentric GSR) :     117 pc/arcsec =  0.117 kpc/arcsec =   7.04 kpc/arcmin =   0.42 Mpc/degree
Scale (Local Group)        :     116 pc/arcsec =  0.116 kpc/arcsec =   6.94 kpc/arcmin =   0.42 Mpc/degree
Scale (3K CMB)             :     137 pc/arcsec =  0.137 kpc/arcsec =   8.23 kpc/arcmin =   0.49 Mpc/degree
Scale (Virgo Infall only)  :     141 pc/arcsec =  0.141 kpc/arcsec =   8.44 kpc/arcmin =   0.51 Mpc/degree
Scale (Virgo + GA only)    :     153 pc/arcsec =  0.153 kpc/arcsec =   9.20 kpc/arcmin =   0.55 Mpc/degree
Scale(Virgo + GA + Shapley):     154 pc/arcsec =  0.154 kpc/arcsec =   9.24 kpc/arcmin =   0.55 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 = 10.817 arcmin and Selected Redshift, defined by the Velocity Range: from to km/sec where V(Heliocentric) = 1776 km/sec
Cosmology-Corrected Quantities [Ho = 73.00 km/sec/Mpc, Ωmatter = 0.27, Ωvacuum = 0.73] [Redshift 0.006885 as corrected to the Reference Frame defined by the 3K Microwave Background Radiation] Luminosity Distance : 28.4 Mpc (m-M) = 32.27 mag Angular-Size Distance : 28 Mpc (m-M) = 32.24 mag Co-Moving Radial Distance : 28.2 Mpc (m-M) = 32.25 mag Co-Moving Tangential Dist. : 28.2 Mpc (m-M) = 32.25 mag Co-Moving Volume : 9.43e-05 Gpc^3 Light Travel-Time : 0.092 Gyr Age at Redshift 0.006885 : 13.207 Gyr Age of Universe : 13.299 Gyr Scale (Cosmology Corrected): 136 pc/arcsec = 0.136 kpc/arcsec = 8.16 kpc/arcmin = 0.49 Mpc/degree Surface Brightness Dimming : Flux Density per Unit Area = 0.97293; Magnitude per Unit Area = 0.0298 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)]
UltravioletNUV (GALEX) AB 17.8599 +/- 0.0499025 mag 2012GASC..C...0000S-13.17 +/- 0.05 [mag] 2.72E+07 +/- 1.25E+06
Visualz (SDSS Model) AB 13.349 +/- 0.003 asinh mag 2006SDSS5.C...0000:-17.68 +/- 0.00 [mag] 4.27E+08 +/- 1.18E+06
Near-InfraredH 11.633 +/- 0.035 mag 20032MASX.C.......:-19.40 +/- 0.04 [mag] 3.35E+08 +/- 1.10E+07
Radio1.4GHz 4.8 +/- 0.6 milliJy 1998AJ....115.1693C 2.08E+29 +/- 2.61E+28 [W] 5.42E+02 +/- 6.78E+01
NOTE: The above quantities are derived using an estimated Distance Modulus of (31.03 +/- N/A) mag corresponding to
a Metric Distance of (16.100 +/- 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 64 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]
r (SDSS Isophotal) 62.4234.3322 25.0 mag arcsec^-2^ 2006SDSS5.C...0000:4.872.68
K_s (2MASS "total") 47.3031.2230 Diameter for "total" magnitude 20032MASX.C.......:20032MASX.C.......:3.692.44
NOTE: Physical diameters are derived using a scale of 0.0781 kpc/arcsec based on Average NED-D Metric Distance of (16.100 +/- N/A) Mpc.
The quantities quoted above have not necessarily been corrected for foreground extinction.

View details for 11 Diameter data point(s) available in NED.

Resources for Object NamesSite/Service
Query SIMBAD by primary NED object name -- IC 2957SIMBAD (CDS, Strasbourg, France)
Original Zwicky Catalog -- CGCG 157-031 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 +05-28-028 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
2MASS Extended Source Images (JHKs) -- 2MASX J11453698+3117584 NASA/IPAC Infrared Science Archive (IRSA)
2MASS Extended Source Images (JHKs) -- 2MASXi J1145369+311758 NASA/IPAC Infrared Science Archive (IRSA)
SDSS Sky Server
Catalogue of Principal Galaxies -- PGC 036653 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
Retrieve mean data from LEDA -- PGC 036653 The Lyon/Meudon Extragalactic Database (LEDA)
Original FIRST Source Catalog -- FIRST J114536.9+311759 Faint Images of the Radio Sky at Twenty-Centimeters
FIRST Survey, Version 1999Jul -- FIRST J114536.9+311759 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
NRAO/VLA Sky Survey (NVSS)
Query GALEX (NUV/FUV) Mission Archive (7.2 arcsec search radius) -- IC 2957GALEX Mission Data Archive at MAST
Explore IRSA resources with RADAR (10 arcsec search radius) -- IC 2957NASA/IPAC Infrared Science Archive (IRSA)
Resources for position 11h45m36.9s, +31d17m58s (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)
    Size:     GIF     FITS File  
Faint Images of the Radio Sky at Twenty-Centimeters
The NRAO Data Archive System

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