NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2022-01-19 T02:50:55 PST
Help | Comment | NED Home

You have selected the following parameters to search on:

Velocity(km/s): Unconstrained
Include ANY Object Type:
Exclude ANY Object Type:

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 NGC 6990
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
  • 45 Photometric data point(s) and SED   
  • Spectra   
    Redshift-Independent Distances
    23 Reference(s)   
    10 Position data point(s)
    1 Redshift data point(s)   
    16 Diameter data point(s)   
    1 Note(s)   
    ESO data    
    RC3 data    

    ESSENTIAL NOTE for NGC 6990 (Back to INDEX)
    N/A

    CROSS-IDENTIFICATIONS for NGC 6990 (Back to INDEX)
    Object Names Type Object Names Type
    NGC 6990G IRAS 20562-5545 IrS
    ESO 187- G 043 G IRAS F20562-5545 IrS
    ESO 205613-5545.4 G SGC 205613-5545.4 G
    WISEA J205956.90-553342.6 IrS ESO-LV 1870430 G
    2MASX J20595692-5533431 IrS APMBGC 187-017+037 G
    2MASS J20595692-5533407 IrS MRSS 187-118111 G
    2MASS J20595692-5533424 IrS PGC 065862 G
    GALEXASC J205956.84-553342.8 UvS    

    COORDINATES for NGC 6990 (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)  314.055821  -55.757236  20h56m13.40s  -55d45m26.1s  1.25E+00  1.25E+00    0
    Equatorial (J2000.0)  314.987167  -55.561972  20h59m56.92s  -55d33m43.1s  1.25E+00  1.25E+00    0
    Ecliptic   (B1950.0)  299.206767  -36.691719                              1.25E+00  1.25E+00    0
    Ecliptic   (J2000.0)  299.908164  -36.697075                              1.25E+00  1.25E+00    0
    Galactic              341.674494  -40.070206                              1.25E+00  1.25E+00    0
    SuperGalactic         224.041764   14.015968                              1.25E+00  1.25E+00    0
    
    Additional detailed measurements with references are also available by clicking below:
    10 Position data point(s)

    REDSHIFT-INDEPENDENT DISTANCES for NGC 6990 (Back to INDEX)
     N/A 

    CLASSIFICATIONS (TYPES, ATTRIBUTES) for NGC 6990 (Back to INDEX)
    TypeAs PublishedNED HomogenizedFlagReference Code
    KinematicsHI line widthHI line width...2005MNRAS.361...34D
    Luminosity Class1.0LC I...1991RC3.9.C...0000d
    Galaxy MorphologySa:Sa?...1991RC3.9.C...0000d
    5 Detailed Classification(s)


    FOREGROUND GALACTIC EXTINCTION for NGC 6990 (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]0.2110.1770.1340.1060.0730.2070.1610.1110.0830.0620.0350.0220.0150.007
    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]0.2590.2060.1580.1270.0920.2460.1810.1310.0990.0700.0430.0270.0170.007


    Galactic Extinction based on H I Column Densities and Galaxy Counts
    (Burstein & Heiles; 1982AJ.....87.1165B) assuming Rv = 3.1:
    AB = 0.170 mag
    See Notes on Galactic Extinction for important caveats.

    BASIC DATA for NGC 6990 (Back to INDEX)
    Helio. Radial Velocity     :      9593 +/-      300 km/s      
    Redshift                   :  0.032000 +/- 0.001000        1991MNRAS.248..528A
    Major Diameter (arcmin)    :   1.1
    Minor Diameter (arcmin)    :   0.5
    Magnitude and Filter       : 13.96
    Classifications            : Sa:                 
    
    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)      45 photometric data point(s)      16 Diameter data point(s)      

    QUANTITIES DERIVED FROM REDSHIFT for NGC 6990 (Details)(Back to INDEX)
    Calculated and Corrected Velocities
    V (Heliocentric)           :    9593 +/-    300 km/s      1991MNRAS.248..528A
    V (Kinematic LSR)          :    9592 +/-    300 km/s      1986MNRAS.221.1023K
    V (Galactocentric GSR)     :    9540 +/-    300 km/s      1991RC3.9.C...0000d
    V (Local Group)            :    9520 +/-    300 km/s      1996AJ....111..794K
    V (3K CMB)                 :    9456 +/-    300 km/s      1996ApJ...473..576F
    V (Virgo Infall only)      :    9437 +/-    300 km/s      2000ApJ...529..786M
    V (Virgo + GA only)        :    9780 +/-    301 km/s      2000ApJ...529..786M
    V (Virgo + GA + Shapley)   :    9836 +/-    301 km/s      2000ApJ...529..786M
    
    Hubble Flow Distance and Distance Modulus (where Ho =   73.0 +/-   5 km/sec/Mpc)
    D (Galactocentric GSR)     :   130.7 +/-   10.0 Mpc      (m-M) = 35.58 +/- 0.16 mag
    D (Local Group)            :   130.4 +/-   10.0 Mpc      (m-M) = 35.58 +/- 0.16 mag
    D (3K CMB)                 :   129.5 +/-   10.0 Mpc      (m-M) = 35.56 +/- 0.16 mag
    D (Virgo Infall only)      :   129.3 +/-    9.9 Mpc      (m-M) = 35.56 +/- 0.16 mag
    D (Virgo + GA only)        :   134.0 +/-   10.2 Mpc      (m-M) = 35.64 +/- 0.16 mag
    D (Virgo + GA + Shapley)   :   134.7 +/-   10.3 Mpc      (m-M) = 35.65 +/- 0.16 mag
    
    Scale at Hubble Flow Distances
    Scale (Galactocentric GSR) :     634 pc/arcsec =  0.634 kpc/arcsec =  38.01 kpc/arcmin =   2.28 Mpc/degree
    Scale (Local Group)        :     632 pc/arcsec =  0.632 kpc/arcsec =  37.93 kpc/arcmin =   2.28 Mpc/degree
    Scale (3K CMB)             :     628 pc/arcsec =  0.628 kpc/arcsec =  37.68 kpc/arcmin =   2.26 Mpc/degree
    Scale (Virgo Infall only)  :     627 pc/arcsec =  0.627 kpc/arcsec =  37.60 kpc/arcmin =   2.26 Mpc/degree
    Scale (Virgo + GA only)    :     650 pc/arcsec =  0.650 kpc/arcsec =  38.97 kpc/arcmin =   2.34 Mpc/degree
    Scale(Virgo + GA + Shapley):     653 pc/arcsec =  0.653 kpc/arcsec =  39.19 kpc/arcmin =   2.35 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 = 2.551 arcmin and Selected Redshift, defined by the Velocity Range: from to km/sec where V(Heliocentric) = 9593 km/sec
    Cosmology-Corrected Quantities [Ho = 73.00 km/sec/Mpc, Ωmatter = 0.27, Ωvacuum = 0.73] [Redshift 0.031542 as corrected to the Reference Frame defined by the 3K Microwave Background Radiation] Luminosity Distance : 133 Mpc (m-M) = 35.62 mag Angular-Size Distance : 125 Mpc (m-M) = 35.48 mag Co-Moving Radial Distance : 129 Mpc (m-M) = 35.55 mag Co-Moving Tangential Dist. : 129 Mpc (m-M) = 35.55 mag Co-Moving Volume : 0.00893 Gpc^3 Light Travel-Time : 0.413 Gyr Age at Redshift 0.031542 : 12.886 Gyr Age of Universe : 13.299 Gyr Scale (Cosmology Corrected): 605 pc/arcsec = 0.605 kpc/arcsec = 36.29 kpc/arcmin = 2.18 Mpc/degree Surface Brightness Dimming : Flux Density per Unit Area = 0.88319; Magnitude per Unit Area = 0.1349 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 6990 (Back to INDEX)
     N/A 

    QUICK-LOOK ANGULAR & PHYSICAL DIAMETERS for NGC 6990 (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 103.5147.61359 27.0 B-mag arcsec^-2^ 1989ESOLV.C...0000L67.6231.10
    K_s (2MASS "total") 87.0040.020 Diameter for "total" magnitude 20032MASX.C.......:20032MASX.C.......:56.8326.14
    NOTE: At z <= 0.5, physical diameters are derived using a Scale at the Hubble Flow Distance (Virgo + GA + Shapley) of 0.653 kpc/arcsec.
    The quantities quoted above have not necessarily been corrected for foreground extinction.

    View details for 16 Diameter data point(s) available in NED.

    EXTERNAL ARCHIVES AND SERVICES for NGC 6990 Help (Back to INDEX)
    Resources for Object NamesSite/Service
    Query SIMBAD by primary NED object name -- NGC 6990SIMBAD (CDS, Strasbourg, France)
    Revised New General Catalogue -- NGC 6990VizieR Catalog Query (U.S. mirror, CfA/Harvard)
    ESO/Uppsala Survey -- ESO 187- G 043 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
    2MASS Extended Source Images (JHKs) -- 2MASX J20595692-5533431 NASA/IPAC Infrared Science Archive (IRSA)
    IRAS Faint Source Catalog -- IRAS F20562-5545 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
    The ESO-LV catalog-- ESO-LV 1870430 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
    Catalogue of Principal Galaxies -- PGC 065862 VizieR Catalog Query (U.S. mirror, CfA/Harvard)
    Retrieve mean data from LEDA -- PGC 065862 The Lyon/Meudon Extragalactic Database (LEDA)
    Query GALEX (NUV/FUV) Mission Archive (7.2 arcsec search radius) -- NGC 6990GALEX Mission Data Archive at MAST
    Explore IRSA resources with RADAR (10 arcsec search radius) -- NGC 6990NASA/IPAC Infrared Science Archive (IRSA)
    Resources for position 20h59m56.9s, -55d33m43s (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





    Back to NED Home