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You have selected the following parameters to search on:

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

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 2646                       08h50m22.0s +73d27m47s G        3680  0.012275      13.09    ...    62     6   28    9     4    6     0 Retrieve Retrieve 1

Detailed information for each object

Object No. 1 - NGC 2646

INDEX for NGC 2646

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

28 Photometric data point(s) and SED

Spectra
Redshift-Independent Distances
62 Reference(s)
9 Position data point(s)
4 Redshift data point(s)
6 Diameter data point(s)
6 Note(s)
UGC data
RC3 data

ESSENTIAL NOTE for NGC 2646 (Back to INDEX)

N/A

CROSS-IDENTIFICATIONS for NGC 2646 (Back to INDEX)

Object Names	Type	Object Names	Type
NGC 2646	G	2MASS J08502199+7327469	IrS
UGC 04604	G	GALEXASC J085022.01+732746.2	UvS
ARK 180	G	LDCE 0573 NED020	G
CGCG 331-069	G	HDCE 0496 NED005	G
CGCG 332-019	G	PGC 024838	G
CGCG 0845.1+7339	G	UZC J085022.0+732746	G
MCG +12-09-019	G	LGG 162:[G93] 003	G
2MASX J08502210+7327474	IrS	[HS98] 082	G

COORDINATES for NGC 2646 (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)  131.249601   73.649048  08h44m59.90s  +73d38m56.6s  1.25E+00  1.25E+00    0
Equatorial (J2000.0)  132.591875   73.463083  08h50m22.05s  +73d27m47.1s  1.25E+00  1.25E+00    0
Ecliptic   (B1950.0)  107.862465   52.760814                              1.25E+00  1.25E+00    0
Ecliptic   (J2000.0)  108.564231   52.766820                              1.25E+00  1.25E+00    0
Galactic              140.329584   34.246742                              1.25E+00  1.25E+00    0
SuperGalactic          34.342845    1.118986                              1.25E+00  1.25E+00    0

Additional detailed measurements with references are also available by clicking below:
9 Position data point(s)

REDSHIFT-INDEPENDENT DISTANCES for NGC 2646 (Back to INDEX)

9 Distances found in NED View 9 Individual Distance Measurement(s) for NGC 2646

Summary Statistics computed by NED from 9 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 2646	Distance Modulus (mag)	Metric Distance (Mpc)
Mean	33.19	46.300
Std. Dev.	0.78	18.026
Min.	32.49	31.500
Max.	34.53	80.500
Median	32.70	34.700

CLASSIFICATIONS (TYPES, ATTRIBUTES) for NGC 2646 (Back to INDEX)

Type	As Published	NED Homogenized	Flag	Reference Code
Hierarchy	GR	Group member, radial-velocity confirmed	...	1993A&AS..100...47G
Galaxy Morphology	SB0^0(r):	SB0^0(r)?	...	1991RC3.9.C...0000d
Distance Indicator	Tully-Fisher	Tully-Fisher	...	2007A&A...465...71T

14 Detailed Classification(s)

FOREGROUND GALACTIC EXTINCTION for NGC 2646 (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 R_v = 3.1 and different source spectrum than SFD98.



     L  a  n  d  o  l  t S  D  S  S U  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)
A_λ [mag] 0.131 0.109 0.083 0.065 0.045 0.128 0.099 0.069 0.051 0.038 0.021 0.014 0.009 0.005

  

Show/Hide A_λ magnitudes in all 88 photometric bands based on SF11
 

Bandpass [µm] A_λ [mag]
Landolt U (0.35)  0.131
Landolt B (0.43)  0.109
Landolt V (0.54)  0.083
Landolt R (0.64)  0.065
Landolt I (0.80)  0.045
CTIO U (0.37)  0.124
CTIO B (0.43)  0.110
CTIO V (0.55)  0.081
CTIO R (0.65)  0.064
CTIO I (0.80)  0.046
UKIRT J (1.25)  0.021
UKIRT H (1.66)  0.014
UKIRT K (2.19)  0.009
UKIRT L' (3.78)  0.005
Gunn g (0.52)  0.088
Gunn r (0.66)  0.062
Gunn i (0.79)  0.047
Gunn z (0.91)  0.037
Spinrad R_S (0.69)  0.058
Stromgren u (0.35)  0.130
Stromgren b (0.47)  0.101
Stromgren v (0.41)  0.114
Stromgren beta (0.49)  0.096
Stromgren y (0.55)  0.081
SDSS u (0.36)  0.128
SDSS g (0.47)  0.099
SDSS r (0.62)  0.069
SDSS i (0.75)  0.051
SDSS z (0.89)  0.038
DSS-II g (0.46)  0.102
DSS-II r (0.65)  0.063
DSS-II i (0.81)  0.045
PS1 g (0.49)  0.096
PS1 r (0.62)  0.068
PS1 i (0.75)  0.051
PS1 z (0.87)  0.040
PS1 y (0.97)  0.033
PS1 w (0.62)  0.071
LSST u (0.37)  0.125
LSST g (0.48)  0.097
LSST r (0.62)  0.068
LSST i (0.75)  0.051
LSST z (0.87)  0.040
LSST y (0.97)  0.033
WFPC2 F300W (0.31)  0.148
WFPC2 F450W (0.46)  0.103
WFPC2 F555W (0.54)  0.083
WFPC2 F606W (0.60)  0.073
WFPC2 F702W (0.69)  0.059
WFPC2 F814W (0.79)  0.047
WFC3 F105W (1.04)  0.029
WFC3 F110W (1.12)  0.027
WFC3 F125W (1.23)  0.022
WFC3 F140W (1.37)  0.018
WFC3 F160W (1.53)  0.015
WFC3 F200LP (0.55)  0.089
WFC3 F218W (0.22)  0.234
WFC3 F225W (0.24)  0.210
WFC3 F275W (0.27)  0.165
WFC3 F300X (0.29)  0.157
WFC3 F336W (0.34)  0.134
WFC3 F350LP (0.59)  0.079
WFC3 F390W (0.40)  0.117
WFC3 F438W (0.43)  0.109
WFC3 F475W (0.48)  0.098
WFC3 F475X (0.50)  0.094
WFC3 F555W (0.53)  0.086
WFC3 F600LP (0.74)  0.054
WFC3 F606W (0.59)  0.075
WFC3 F625W (0.62)  0.068
WFC3 F775W (0.76)  0.049
WFC3 F814W (0.80)  0.046
WFC3 F850LP (0.91)  0.036
ACS clear (0.62)  0.073
ACS F435W (0.43)  0.109
ACS F475W (0.48)  0.098
ACS F550M (0.56)  0.079
ACS F555W (0.54)  0.084
ACS F606W (0.59)  0.074
ACS F625W (0.63)  0.067
ACS F775W (0.77)  0.049
ACS F814W (0.80)  0.046
ACS F850LP (0.90)  0.037
DES g (0.48)  0.097
DES r (0.64)  0.066
DES i (0.78)  0.048
DES z (0.91)  0.037
DES Y (0.99)  0.032


For completeness, we include the original SFD98 values:


     L  a  n  d  o  l  t S  D  S  S U  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)
A_λ [mag] 0.157 0.125 0.096 0.077 0.056 0.149 0.110 0.080 0.060 0.043 0.026 0.017 0.011 0.004


Galactic Extinction based on H I Column Densities and Galaxy Counts 
(Burstein & Heiles; 1982AJ.....87.1165B) assuming R_v = 3.1:
A_B = 0.040 mag 

See Notes on Galactic Extinction for important caveats.

BASIC DATA for NGC 2646 (Back to INDEX)

Helio. Radial Velocity     :      3680 +/-       27 km/s      
Redshift                   :  0.012275 +/- 0.000090        1991RC3.9.C...0000d
Major Diameter (arcmin)    :   1.3
Minor Diameter (arcmin)    :   1.3
Magnitude and Filter       : 13.09
Classifications            : SB(r)0^0^:          

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:
4 Redshift data point(s)      28 photometric data point(s)      6 Diameter data point(s)

QUANTITIES DERIVED FROM REDSHIFT for NGC 2646 (Details)(Back to INDEX)

Calculated and Corrected Velocities
V (Heliocentric)           :    3680 +/-     27 km/s      1991RC3.9.C...0000d
V (Kinematic LSR)          :    3686 +/-     27 km/s      1986MNRAS.221.1023K
V (Galactocentric GSR)     :    3801 +/-     27 km/s      1991RC3.9.C...0000d
V (Local Group)            :    3844 +/-     29 km/s      1996AJ....111..794K
V (3K CMB)                 :    3722 +/-     27 km/s      1996ApJ...473..576F
V (Virgo Infall only)      :    3969 +/-     30 km/s      2000ApJ...529..786M
V (Virgo + GA only)        :    3938 +/-     30 km/s      2000ApJ...529..786M
V (Virgo + GA + Shapley)   :    3948 +/-     30 km/s      2000ApJ...529..786M

Hubble Flow Distance and Distance Modulus (where H_o =   73.0 +/-   5 km/sec/Mpc)
D (Galactocentric GSR)     :    52.1 +/-    3.7 Mpc      (m-M) = 33.58 +/- 0.15 mag
D (Local Group)            :    52.7 +/-    3.7 Mpc      (m-M) = 33.61 +/- 0.15 mag
D (3K CMB)                 :    51.0 +/-    3.6 Mpc      (m-M) = 33.54 +/- 0.15 mag
D (Virgo Infall only)      :    54.4 +/-    3.8 Mpc      (m-M) = 33.68 +/- 0.15 mag
D (Virgo + GA only)        :    53.9 +/-    3.8 Mpc      (m-M) = 33.66 +/- 0.15 mag
D (Virgo + GA + Shapley)   :    54.1 +/-    3.8 Mpc      (m-M) = 33.67 +/- 0.15 mag

Scale at Hubble Flow Distances
Scale (Galactocentric GSR) :     252 pc/arcsec =  0.252 kpc/arcsec =  15.14 kpc/arcmin =   0.91 Mpc/degree
Scale (Local Group)        :     255 pc/arcsec =  0.255 kpc/arcsec =  15.32 kpc/arcmin =   0.92 Mpc/degree
Scale (3K CMB)             :     247 pc/arcsec =  0.247 kpc/arcsec =  14.83 kpc/arcmin =   0.89 Mpc/degree
Scale (Virgo Infall only)  :     264 pc/arcsec =  0.264 kpc/arcsec =  15.81 kpc/arcmin =   0.95 Mpc/degree
Scale (Virgo + GA only)    :     262 pc/arcsec =  0.262 kpc/arcsec =  15.69 kpc/arcmin =   0.94 Mpc/degree
Scale(Virgo + GA + Shapley):     262 pc/arcsec =  0.262 kpc/arcsec =  15.73 kpc/arcmin =   0.94 Mpc/degree











To Search for Nearby Objects (Physical Companions):
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Search for Objects within +/-arcmin where 100 kpc =  6.356 arcmin  
and Selected Redshift, defined by the Velocity Range:
from  to km/sec where V(Heliocentric) =   3680 km/sec  






Cosmology-Corrected Quantities [H_o =  73.00 km/sec/Mpc, Ω_matter =   0.27, Ω_vacuum =   0.73]
[Redshift 0.012416 as corrected to the Reference Frame defined by the 3K Microwave Background Radiation]
Luminosity Distance        : 51.5 Mpc      (m-M) = 33.56 mag
Angular-Size Distance      : 50.2 Mpc      (m-M) = 33.51 mag
Co-Moving Radial Distance  : 50.9 Mpc      (m-M) = 33.53 mag
Co-Moving Tangential Dist. : 50.9 Mpc      (m-M) = 33.53 mag
Co-Moving Volume           : 0.000551 Gpc^3
Light Travel-Time          :    0.165 Gyr
Age at Redshift 0.012416   :   13.134 Gyr
Age of Universe            :   13.299 Gyr
Scale (Cosmology Corrected):     244 pc/arcsec =  0.244 kpc/arcsec =  14.61 kpc/arcmin =   0.88 Mpc/degree
Surface Brightness Dimming : Flux Density per Unit Area =  0.95184; Magnitude per Unit Area = 0.05359 mag







To change Cosmological Input Parameters for Derived Quantities:
Enter Your Preferred Values and click on "Submit Changed Hubble Parameters for this object" button 

H_oΩ_matterΩ_vacuum
    


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 2646 (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 νL_ν [W]	νL_ν [L_☉(Bolometric)]
Ultraviolet	NUV (GALEX) AB	18.2067 +/- 0.0625454 mag	2012GASC..C...0000S	-14.98 +/- 0.65 [mag]	1.63E+08 +/- 4.32E+07
Visual	B (m_B^0)	13.00 mag	1991RC3.9.C...0000d	-20.19 [mag]	1.22E+10
Near-Infrared	H	9.667 +/- 0.018 mag	20032MASX.C.......:	-23.52 +/- 0.65 [mag]	1.69E+10 +/- 4.39E+09
Mid-Infrared	12 microns (IRAS)	<0.018 Jy	1994PrivC.U..J....K	< 1.15E+35 [W]	< 3.00E+08
Far-Infrared	100 microns (IRAS)	0.860 +/- 0.092 Jy	1994PrivC.U..J....K	6.62E+35 +/- 1.86E+35 [W]	1.72E+09 +/- 4.83E+08

NOTE: The above quantities are derived using an estimated Distance Modulus of (33.19 +/- 0.78) mag corresponding to
a Metric Distance of (46.300 +/- 18.026) 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 28 Photometric data point(s) available in NED.

QUICK-LOOK ANGULAR & PHYSICAL DIAMETERS for NGC 2646 (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	Refcode	Physical Major Axis (2a) [kpc]	Physical Minor Axis (2b) [kpc]
POSS1 103a-O	102.00	102.00	...	About 25.0 B-mag arcsec^-2^	1973UGC...C...0000N	22.90	22.90
K_s (2MASS "total")	97.90	78.32	80	Diameter for "total" magnitude 20032MASX.C.......:	20032MASX.C.......:	21.98	17.58

NOTE: Physical diameters are derived using a scale of 0.2245 kpc/arcsec based on Average NED-D Metric Distance of (46.300 +/- 18.026) Mpc.
The quantities quoted above have not necessarily been corrected for foreground extinction.

View details for 6 Diameter data point(s) available in NED.

EXTERNAL ARCHIVES AND SERVICES for NGC 2646 Help (Back to INDEX)

Resources for Object Names	Site/Service
Query SIMBAD by primary NED object name -- NGC 2646	SIMBAD (CDS, Strasbourg, France)
Revised New General Catalogue -- NGC 2646	VizieR Catalog Query (U.S. mirror, CfA/Harvard)
Uppsala General Catalog -- UGC 04604	VizieR Catalog Query (U.S. mirror, CfA/Harvard)
Original Zwicky Catalog -- CGCG 331-069	VizieR Catalog Query (U.S. mirror, CfA/Harvard)
Query UZC Spectral Archive (60 arcsec search radius)	Updated Zwicky Catalog Data (Harvard/SAO)
Original Zwicky Catalog -- CGCG 332-019	VizieR Catalog Query (U.S. mirror, CfA/Harvard)
Morphological Catalog of Galaxies -- MCG +12-09-019	VizieR Catalog Query (U.S. mirror, CfA/Harvard)
2MASS Extended Source Images (JHKs) -- 2MASX J08502210+7327474	NASA/IPAC Infrared Science Archive (IRSA)
Catalogue of Principal Galaxies -- PGC 024838	VizieR Catalog Query (U.S. mirror, CfA/Harvard)
Retrieve mean data from LEDA -- PGC 024838	The Lyon/Meudon Extragalactic Database (LEDA)
Query GALEX (NUV/FUV) Mission Archive (7.2 arcsec search radius) -- NGC 2646	GALEX Mission Data Archive at MAST
Explore IRSA resources with RADAR (10 arcsec search radius) -- NGC 2646	NASA/IPAC Infrared Science Archive (IRSA)
Resources for position 08h50m22.0s, +73d27m47s (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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NED results for object NGC 2646

1 objects found in NED.

Detailed information for each object