NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2022-01-19 T12:33:36 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 6721


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 6721                       19h00m50.8s -57d45m34s G        4421  0.014747      13.06    ...    80     3   63    9    10   17     0 Retrieve Retrieve 1   

Detailed information for each object


Object No. 1 - NGC 6721

INDEX for NGC 6721
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
  • 63 Photometric data point(s) and SED   
  • Spectra   
    Redshift-Independent Distances
    80 Reference(s)   
    9 Position data point(s)
    10 Redshift data point(s)   
    17 Diameter data point(s)   
    3 Note(s)   
    ESO data    
    RC3 data    

    ESSENTIAL NOTE for NGC 6721 (Back to INDEX)
    N/A

    CROSS-IDENTIFICATIONS for NGC 6721 (Back to INDEX)
    Object Names Type Object Names Type
    NGC 6721G SGC 185634-5749.7 G
    ESO 141- G 019 G ESO-LV 1410190 G
    ESO 185634-5749.7 G 6dF J1900507-574534 G
    WISEA J190050.81-574534.0 IrS 6dF J1900508-574534 G
    2MASX J19005081-5745337 IrS 6dFGSv 09065 G
    2MASS J19005078-5745341 IrS LDCE 1323 NED058 G
    GALEXASC J190050.76-574533.8 UvS PGC 062680 G
         

    COORDINATES for NGC 6721 (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)  284.143288  -57.829996  18h56m34.39s  -57d49m48.0s  1.25E+00  1.25E+00    0
    Equatorial (J2000.0)  285.211708  -57.759444  19h00m50.81s  -57d45m34.0s  1.25E+00  1.25E+00    0
    Ecliptic   (B1950.0)  279.119559  -34.831230                              1.25E+00  1.25E+00    0
    Ecliptic   (J2000.0)  279.819333  -34.837550                              1.25E+00  1.25E+00    0
    Galactic              338.595372  -23.901369                              1.25E+00  1.25E+00    0
    SuperGalactic         207.261270   16.521680                              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 6721 (Back to INDEX)

    8 Distances found in NED View 8 Individual Distance Measurement(s) for NGC 6721

    Summary Statistics computed by NED from 8 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 6721 Distance Modulus
    (mag)
    Metric Distance
    (Mpc)
    Mean 33.84 61.050
    Std. Dev. 0.69 18.095
    Min. 32.68 34.400
    Max. 34.75 89.200
    Median 33.83 58.500

    CLASSIFICATIONS (TYPES, ATTRIBUTES) for NGC 6721 (Back to INDEX)
    TypeAs PublishedNED HomogenizedFlagReference Code
    HierarchyIEIsolated elliptical galaxy...1987ApJS...64..643S
    Galaxy MorphologycD:cD?...1991RC3.9.C...0000d
    Distance IndicatorD-SigmaD-Sigma...1997ApJS..109..333W
    9 Detailed Classification(s)


    FOREGROUND GALACTIC EXTINCTION for NGC 6721 (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]0.2600.2170.1640.1300.0900.2540.1980.1370.1020.0760.0430.0270.0180.009
    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]0.3290.2610.2000.1620.1170.3120.2290.1660.1260.0890.0550.0350.0220.009


    Galactic Extinction based on H I Column Densities and Galaxy Counts
    (Burstein & Heiles; 1982AJ.....87.1165B) assuming Rv = 3.1:
    AB = 0.260 mag
    See Notes on Galactic Extinction for important caveats.

    BASIC DATA for NGC 6721 (Back to INDEX)
    Helio. Radial Velocity     :      4421 +/-       25 km/s      
    Redshift                   :  0.014747 +/- 0.000083        1991RC3.9.C...0000d
    Major Diameter (arcmin)    :   1.7
    Minor Diameter (arcmin)    :   1.4
    Magnitude and Filter       : 13.06
    Classifications            : E+:                 
    
    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:
    10 Redshift data point(s)      63 photometric data point(s)      17 Diameter data point(s)      

    QUANTITIES DERIVED FROM REDSHIFT for NGC 6721 (Details)(Back to INDEX)
    Calculated and Corrected Velocities
    V (Heliocentric)           :    4421 +/-     25 km/s      1991RC3.9.C...0000d
    V (Kinematic LSR)          :    4422 +/-     25 km/s      1986MNRAS.221.1023K
    V (Galactocentric GSR)     :    4348 +/-     25 km/s      1991RC3.9.C...0000d
    V (Local Group)            :    4311 +/-     26 km/s      1996AJ....111..794K
    V (3K CMB)                 :    4369 +/-     25 km/s      1996ApJ...473..576F
    V (Virgo Infall only)      :    4301 +/-     26 km/s      2000ApJ...529..786M
    V (Virgo + GA only)        :    4746 +/-     40 km/s      2000ApJ...529..786M
    V (Virgo + GA + Shapley)   :    4772 +/-     40 km/s      2000ApJ...529..786M
    
    Hubble Flow Distance and Distance Modulus (where Ho =   73.0 +/-   5 km/sec/Mpc)
    D (Galactocentric GSR)     :    59.6 +/-    4.2 Mpc      (m-M) = 33.88 +/- 0.15 mag
    D (Local Group)            :    59.1 +/-    4.1 Mpc      (m-M) = 33.86 +/- 0.15 mag
    D (3K CMB)                 :    59.9 +/-    4.2 Mpc      (m-M) = 33.89 +/- 0.15 mag
    D (Virgo Infall only)      :    58.9 +/-    4.1 Mpc      (m-M) = 33.85 +/- 0.15 mag
    D (Virgo + GA only)        :    65.0 +/-    4.6 Mpc      (m-M) = 34.07 +/- 0.15 mag
    D (Virgo + GA + Shapley)   :    65.4 +/-    4.6 Mpc      (m-M) = 34.08 +/- 0.15 mag
    
    Scale at Hubble Flow Distances
    Scale (Galactocentric GSR) :     289 pc/arcsec =  0.289 kpc/arcsec =  17.33 kpc/arcmin =   1.04 Mpc/degree
    Scale (Local Group)        :     286 pc/arcsec =  0.286 kpc/arcsec =  17.18 kpc/arcmin =   1.03 Mpc/degree
    Scale (3K CMB)             :     290 pc/arcsec =  0.290 kpc/arcsec =  17.41 kpc/arcmin =   1.04 Mpc/degree
    Scale (Virgo Infall only)  :     286 pc/arcsec =  0.286 kpc/arcsec =  17.14 kpc/arcmin =   1.03 Mpc/degree
    Scale (Virgo + GA only)    :     315 pc/arcsec =  0.315 kpc/arcsec =  18.91 kpc/arcmin =   1.13 Mpc/degree
    Scale(Virgo + GA + Shapley):     317 pc/arcsec =  0.317 kpc/arcsec =  19.01 kpc/arcmin =   1.14 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 = 5.259 arcmin and Selected Redshift, defined by the Velocity Range: from to km/sec where V(Heliocentric) = 4421 km/sec
    Cosmology-Corrected Quantities [Ho = 73.00 km/sec/Mpc, Ωmatter = 0.27, Ωvacuum = 0.73] [Redshift 0.014575 as corrected to the Reference Frame defined by the 3K Microwave Background Radiation] Luminosity Distance : 60.5 Mpc (m-M) = 33.91 mag Angular-Size Distance : 58.8 Mpc (m-M) = 33.85 mag Co-Moving Radial Distance : 59.7 Mpc (m-M) = 33.88 mag Co-Moving Tangential Dist. : 59.7 Mpc (m-M) = 33.88 mag Co-Moving Volume : 0.00089 Gpc^3 Light Travel-Time : 0.193 Gyr Age at Redshift 0.014575 : 13.106 Gyr Age of Universe : 13.299 Gyr Scale (Cosmology Corrected): 285 pc/arcsec = 0.285 kpc/arcsec = 17.11 kpc/arcmin = 1.03 Mpc/degree Surface Brightness Dimming : Flux Density per Unit Area = 0.94376; Magnitude per Unit Area = 0.06284 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 6721 (Back to INDEX)
     N/A 

    QUICK-LOOK ANGULAR & PHYSICAL DIAMETERS for NGC 6721 (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]
    ESO-LV "Quick Blue" IIa-O 175.79145.91160 27.0 B-mag arcsec^-2^ 1989ESOLV.C...0000L52.0343.18
    K_s (2MASS "total") 120.8096.64135 Diameter for "total" magnitude 20032MASX.C.......:20032MASX.C.......:35.7528.60
    NOTE: Physical diameters are derived using a scale of 0.2960 kpc/arcsec based on Average NED-D Metric Distance of (61.050 +/- 18.095) Mpc.
    The quantities quoted above have not necessarily been corrected for foreground extinction.

    View details for 17 Diameter data point(s) available in NED.

    EXTERNAL ARCHIVES AND SERVICES for NGC 6721 Help (Back to INDEX)
    Resources for Object NamesSite/Service
    Query SIMBAD by primary NED object name -- NGC 6721SIMBAD (CDS, Strasbourg, France)
    Revised New General Catalogue -- NGC 6721VizieR Catalog Query (U.S. mirror, CfA/Harvard)
    ESO/Uppsala Survey -- ESO 141- G 019 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
    2MASS Extended Source Images (JHKs) -- 2MASX J19005081-5745337 NASA/IPAC Infrared Science Archive (IRSA)
    The ESO-LV catalog-- ESO-LV 1410190 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
    Query 6dF Galaxy Redshift Survey -- 6dF J1900507-574534 6dF Galaxy Redshift Survey
    Query 6dF Galaxy Redshift Survey -- 6dF J1900508-574534 6dF Galaxy Redshift Survey
    Query 6dF Galaxy Redshift Survey -- 6dFGSv 09065 6dF Galaxy Redshift Survey
    Catalogue of Principal Galaxies -- PGC 062680 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
    Retrieve mean data from LEDA -- PGC 062680 The Lyon/Meudon Extragalactic Database (LEDA)
    Query GALEX (NUV/FUV) Mission Archive (7.2 arcsec search radius) -- NGC 6721GALEX Mission Data Archive at MAST
    Explore IRSA resources with RADAR (10 arcsec search radius) -- NGC 6721NASA/IPAC Infrared Science Archive (IRSA)
    Resources for position 19h00m50.8s, -57d45m34s (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)
    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)
    The NRAO Data Archive System

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